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47 results on '"Aigrain, S."'

2. Transiting exoplanets from the CoRoT space mission

Author

Barge, P, Baglin, A, Auvergne, M, Rauer, H, Leger, A, Schneider, J, Pont, F, Aigrain, S, Almenara, J-M, Alonso, R, Barbieri, M, Borde, P, Bouchy, F, Deeg, HJ, Deleuil, M, Dvorak, R, Erikson, A, Fridlund, M, Gillon, M, Gondoin, P, Guillot, T, Hatzes, A, Hebrard, G, Jorda, L, Kabath, P, Lammer, H, Llebaria, A, Loeillet, B, Magain, P, Mazeh, T, Moutou, C, Ollivier, M, Paetzold, M, Queloz, D, Rouan, D, Shporer, A, and Wuchterl, G

Published
2008

3. Transiting exoplanets from the CoRoT space mission

Author

Alonso, R, Auvergne, M, Baglin, A, Ollivier, M, Moutou, C, Rouan, D, Deeg, HJ, Aigrain, S, Almenara, JM, Barbieri, M, Barge, P, Benz, W, Borde, P, Bouchy, F, De la Reza, R, Deleuil, M, Dvorak, R, Erikson, A, Fridlund, M, Gillon, M, Gondoin, P, Guillot, T, Hatzes, A, Hebrard, G, Kabath, P, Jorda, L, Lammer, H, Leger, A, Llebaria, A, Loeillet, B, Magain, P, Mayor, M, Mazeh, T, Paetzold, M, Pepe, F, Pont, F, Queloz, D, Rauer, H, Shporer, A, Schneider, J, Stecklum, B, Udry, S, and Wuchterl, G

Published
2008

4. The photospheric abundances of active binaries - 1. Detailed analysis of HD 113816 (IS Vir) and HD 119285 (V851 Cen)

Author

Katz, D, Favata, F, Aigrain, S, and Micela, G

Abstract

The high-resolution optical spectra of the two X-ray active binaries RS CVn stars HD 113816 (IS Vir) and HD 119285 (V851 Cen) are analysed and their Na, Mg, Al, Si, Ca, Sc, Ti, Co and Ni contents determined, in the framework of a larger program of chemical analysis of RS CVn stellar atmosphere. The analysis of IS Vir and V851 Cen is performed with three different LTE methods. In the first one, abundances are derived for a large set of transitions (among which 28 Fe I lines, spanning a broad interval in excitation potential and equivalent width, and 6 Fe II transitions) using measured equivalent widths and Kurucz LTE model atmospheres as input for the MOOG software package. The input atmospheric parameters and abundances are iteratively modified until (i) the Fe I abundances exhibit no trend with excitation potential or equivalent width, (ii) Fe I and Fe II average abundances are the same and (iii) Fe and Alpha elements average abundances are consistent with the input values. The second method follows a similar approach, but uses a restricted line list (without the Fe I "low excitation potential" transitions) and relies on the B - V and V - I colour indices to determine the temperature. The third method uses the same restricted line list as the second method and relies on fitting the 6162 Å Ca I line wing profiles to derive the surface gravity. The reliability of these methods is investigated in the context of single line RS CVn stars. It is shown that the V - I photometric index gives, on a broader sample of stars, significantly cooler estimates of the effective temperature than the B - v index. All approaches give results in good agreement with each other, except the V - 1 based method. The analysis of IS Vir and V851 Cen results in both cases in their primaries being giant stars of near-solar metallicity. Their parameters as derived with the first method are respectively Teff = 4720 K, log g = 2.65, [Fe/H] = +0.04 and Teff = 4700 K, log g = 3.0 and [Fe/H] = -0.13. In the case of V851 Cen the derived iron content is significantly higher than a previous determination in the literature. Both stars exhibit relative overabundances of several elements (e.g. Ca) with respect to the solar mix.

Published
2003

5. Transiting exoplanets from the CoRoT space mission

Author

Bonomo, A. S., primary, Santerne, A., additional, Alonso, R., additional, Gazzano, J.-C., additional, Havel, M., additional, Aigrain, S., additional, Auvergne, M., additional, Baglin, A., additional, Barbieri, M., additional, Barge, P., additional, Benz, W., additional, Bordé, P., additional, Bouchy, F., additional, Bruntt, H., additional, Cabrera, J., additional, Cameron, A. C., additional, Carone, L., additional, Carpano, S., additional, Csizmadia, Sz., additional, Deleuil, M., additional, Deeg, H. J., additional, Dvorak, R., additional, Erikson, A., additional, Ferraz-Mello, S., additional, Fridlund, M., additional, Gandolfi, D., additional, Gillon, M., additional, Guenther, E., additional, Guillot, T., additional, Hatzes, A., additional, Hébrard, G., additional, Jorda, L., additional, Lammer, H., additional, Lanza, A. F., additional, Léger, A., additional, Llebaria, A., additional, Mayor, M., additional, Mazeh, T., additional, Moutou, C., additional, Ollivier, M., additional, Pätzold, M., additional, Pepe, F., additional, Queloz, D., additional, Rauer, H., additional, Rouan, D., additional, Samuel, B., additional, Schneider, J., additional, Tingley, B., additional, Udry, S., additional, and Wuchterl, G., additional

Published
2010
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7. Photospheric activity, rotation, and radial velocity variations of the planet-hosting star CoRoT-7

Author

Lanza, A. F., primary, Bonomo, A. S., additional, Moutou, C., additional, Pagano, I., additional, Messina, S., additional, Leto, G., additional, Cutispoto, G., additional, Aigrain, S., additional, Alonso, R., additional, Barge, P., additional, Deleuil, M., additional, Auvergne, M., additional, Baglin, A., additional, and Collier Cameron, A., additional

Published
2010
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8. Transiting exoplanets from the CoRoT space mission

Author

Gillon, M., primary, Hatzes, A., additional, Csizmadia, Sz., additional, Fridlund, M., additional, Deleuil, M., additional, Aigrain, S., additional, Alonso, R., additional, Auvergne, M., additional, Baglin, A., additional, Barge, P., additional, Barnes, S. I., additional, Bonomo, A. S., additional, Bordé, P., additional, Bouchy, F., additional, Bruntt, H., additional, Cabrera, J., additional, Carone, L., additional, Carpano, S., additional, Cochran, W. D., additional, Deeg, H. J., additional, Dvorak, R., additional, Endl, M., additional, Erikson, A., additional, Ferraz-Mello, S., additional, Gandolfi, D., additional, Gazzano, J. C., additional, Guenther, E., additional, Guillot, T., additional, Havel, M., additional, Hébrard, G., additional, Jorda, L., additional, Léger, A., additional, Llebaria, A., additional, Lammer, H., additional, Lovis, C., additional, Mayor, M., additional, Mazeh, T., additional, Montalbán, J., additional, Moutou, C., additional, Ofir, A., additional, Ollivier, M., additional, Pätzold, M., additional, Pepe, F., additional, Queloz, D., additional, Rauer, H., additional, Rouan, D., additional, Samuel, B., additional, Santerne, A., additional, Schneider, J., additional, Tingley, B., additional, Udry, S., additional, Weingrill, J., additional, and Wuchterl, G., additional

Published
2010
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9. Transiting exoplanets from the CoRoT space mission

Author

Bordé, P., primary, Bouchy, F., additional, Deleuil, M., additional, Cabrera, J., additional, Jorda, L., additional, Lovis, C., additional, Csizmadia, S., additional, Aigrain, S., additional, Almenara, J. M., additional, Alonso, R., additional, Auvergne, M., additional, Baglin, A., additional, Barge, P., additional, Benz, W., additional, Bonomo, A. S., additional, Bruntt, H., additional, Carone, L., additional, Carpano, S., additional, Deeg, H., additional, Dvorak, R., additional, Erikson, A., additional, Ferraz-Mello, S., additional, Fridlund, M., additional, Gandolfi, D., additional, Gazzano, J.-C., additional, Gillon, M., additional, Guenther, E., additional, Guillot, T., additional, Guterman, P., additional, Hatzes, A., additional, Havel, M., additional, Hébrard, G., additional, Lammer, H., additional, Léger, A., additional, Mayor, M., additional, Mazeh, T., additional, Moutou, C., additional, Pätzold, M., additional, Pepe, F., additional, Ollivier, M., additional, Queloz, D., additional, Rauer, H., additional, Rouan, D., additional, Samuel, B., additional, Santerne, A., additional, Schneider, J., additional, Tingley, B., additional, Udry, S., additional, Weingrill, J., additional, and Wuchterl, G., additional

Published
2010
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10. Possible detection of phase changes from the non-transiting planet HD 46375b by CoRoT

Author

Gaulme, P., primary, Vannier, M., additional, Guillot, T., additional, Mosser, B., additional, Mary, D., additional, Weiss, W. W., additional, Schmider, F.-X., additional, Bourguignon, S., additional, Deeg, H. J., additional, Régulo, C., additional, Aigrain, S., additional, Schneider, J., additional, Bruntt, H., additional, Deheuvels, S., additional, Donati, J.-F., additional, Appourchaux, T., additional, Auvergne, M., additional, Baglin, A., additional, Baudin, F., additional, Catala, C., additional, Michel, E., additional, and Samadi, R., additional

Published
2010
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11. Transiting exoplanets from the CoRoT space mission

Author

Fridlund, M., primary, Hébrard, G., additional, Alonso, R., additional, Deleuil, M., additional, Gandolfi, D., additional, Gillon, M., additional, Bruntt, H., additional, Alapini, A., additional, Csizmadia, Sz., additional, Guillot, T., additional, Lammer, H., additional, Aigrain, S., additional, Almenara, J. M., additional, Auvergne, M., additional, Baglin, A., additional, Barge, P., additional, Bordé, P., additional, Bouchy, F., additional, Cabrera, J., additional, Carone, L., additional, Carpano, S., additional, Deeg, H. J., additional, De la Reza, R., additional, Dvorak, R., additional, Erikson, A., additional, Ferraz-Mello, S., additional, Guenther, E., additional, Gondoin, P., additional, den Hartog, R., additional, Hatzes, A., additional, Jorda, L., additional, Léger, A., additional, Llebaria, A., additional, Magain, P., additional, Mazeh, T., additional, Moutou, C., additional, Ollivier, M., additional, Pätzold, M., additional, Queloz, D., additional, Rauer, H., additional, Rouan, D., additional, Samuel, B., additional, Schneider, J., additional, Shporer, A., additional, Stecklum, B., additional, Tingley, B., additional, Weingrill, J., additional, and Wuchterl, G., additional

Published
2010
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12. ASTEP South: an Antarctic Search for Transiting ExoPlanets around the celestial south pole

Author

Crouzet, N., primary, Guillot, T., additional, Agabi, A., additional, Rivet, J.-P., additional, Bondoux, E., additional, Challita, Z., additional, Fanteï-Caujolle, Y., additional, Fressin, F., additional, Mékarnia, D., additional, Schmider, F.-X., additional, Valbousquet, F., additional, Blazit, A., additional, Bonhomme, S., additional, Abe, L., additional, Daban, J.-B., additional, Gouvret, C., additional, Fruth, T., additional, Rauer, H., additional, Erikson, A., additional, Barbieri, M., additional, Aigrain, S., additional, and Pont, F., additional

Published
2010
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13. Transit timing analysis of CoRoT-1b

Author

Csizmadia, Sz., primary, Renner, S., additional, Barge, P., additional, Agol, E., additional, Aigrain, S., additional, Alonso, R., additional, Almenara, J.-M., additional, Bonomo, A. S., additional, Bordé, P., additional, Bouchy, F., additional, Cabrera, J., additional, Deeg, H. J., additional, De la Reza, R., additional, Deleuil, M., additional, Dvorak, R., additional, Erikson, A., additional, Guenther, E. W., additional, Fridlund, M., additional, Gondoin, P., additional, Guillot, T., additional, Hatzes, A., additional, Jorda, L., additional, Lammer, H., additional, Lázaro, C., additional, Léger, A., additional, Llebaria, A., additional, Magain, P., additional, Moutou, C., additional, Ollivier, M., additional, Pätzold, M., additional, Queloz, D., additional, Rauer, H., additional, Rouan, D., additional, Schneider, J., additional, Wuchterl, G., additional, and Gandolfi, D., additional

Published
2010
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14. Transiting exoplanets from the CoRoT space mission *

Author

Léger, A., Rouan, D., Schneider, J., Barge, P., Fridlund, M., Samuel, B., Ollivier, M., Guenther, E., Deleuil, M., Deeg, H. J., Auvergne, M., Alonso, R., Aigrain, S., Alapini, A., Almenara, J. M., Baglin, A., Barbieri, M., Bruntt, H., Bordé, P., Bouchy, F., Cabrera, J., Catala, C., Carone, L., Carpano, S., Csizmadia, Sz., Dvorak, R., Erikson, A., Ferraz-Mello, S., Foing, B., Fressin, F., Gandolfi, D., Gillon, M., Gondoin, Ph., Grasset, O., Guillot, T., Hatzes, A., Hébrard, G., Jorda, L., Lammer, H., Llebaria, A., Loeillet, B., Mayor, M., Mazeh, T., Moutou, C., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Renner, S., Samadi, R., Shporer, A., Sotin, Ch., Tingley, B., Wuchterl, G., Adda, M., Agogu, P., Appourchaux, T., Ballans, H., Baron, P., Beaufort, T., Bellenger, R., Berlin, R., Bernardi, P., Blouin, D., Baudin, F., Bodin, P., Boisnard, L., Boit, L., Bonneau, F., Borzeix, S., Briet, R., Buey, J.-T., Butler, B., Cailleau, D., Cautain, R., Chabaud, P.-Y., Chaintreuil, S., Chiavassa, F., Costes, V., Cuna Parrho, V., De Oliveira Fialho, F., Decaudin, M., Defise, J.-M., Djalal, S., Epstein, G., Exil, G.-E., Fauré, C., Fenouillet, T., Gaboriaud, A., Gallic, A., Gamet, P., Gavalda, P., Grolleau, E., Gruneisen, R., Gueguen, L., Guis, V., Guivarc'h, V., Guterman, P., Hallouard, D., Hasiba, J., Heuripeau, F., Huntzinger, G., Hustaix, H., Imad, C., Imbert, C., Johlander, B., Jouret, M., Journoud, P., Karioty, F., Kerjean, L., Lafaille, V., Lafond, L., Lam-Trong, T., Landiech, P., Lapeyrere, V., Larqué, T., Laudet, P., Lautier, N., Lecann, H., Lefevre, L., Leruyet, B., Levacher, P., Magnan, A., Mazy, E., Mertens, F., Mesnager, J.-M., Meunier, J.-C., Michel, J.-P., Monjoin, W., Naudet, D., Nguyen-Kim, K., Orcesi, J.-L., Ottacher, H., Perez, R., Peter, G., Plasson, P., Plesseria, J.-Y., Pontet, B., Pradines, A., Quentin, C., Reynaud, J.-L., Rolland, G., Rollenhagen, F., Romagnan, R., Russ, N., Schmidt, R., Schwartz, N., Sebbag, I., Sedes, G., Smit, H., Steller, M. B., Sunter, W., Surace, C., Tello, M., Tiphène, D., Toulouse, P., Ulmer, B., Vandermarcq, O., Vergnault, E., Vuillemin, A., Zanatta, P., Léger, A., Rouan, D., Schneider, J., Barge, P., Fridlund, M., Samuel, B., Ollivier, M., Guenther, E., Deleuil, M., Deeg, H. J., Auvergne, M., Alonso, R., Aigrain, S., Alapini, A., Almenara, J. M., Baglin, A., Barbieri, M., Bruntt, H., Bordé, P., Bouchy, F., Cabrera, J., Catala, C., Carone, L., Carpano, S., Csizmadia, Sz., Dvorak, R., Erikson, A., Ferraz-Mello, S., Foing, B., Fressin, F., Gandolfi, D., Gillon, M., Gondoin, Ph., Grasset, O., Guillot, T., Hatzes, A., Hébrard, G., Jorda, L., Lammer, H., Llebaria, A., Loeillet, B., Mayor, M., Mazeh, T., Moutou, C., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Renner, S., Samadi, R., Shporer, A., Sotin, Ch., Tingley, B., Wuchterl, G., Adda, M., Agogu, P., Appourchaux, T., Ballans, H., Baron, P., Beaufort, T., Bellenger, R., Berlin, R., Bernardi, P., Blouin, D., Baudin, F., Bodin, P., Boisnard, L., Boit, L., Bonneau, F., Borzeix, S., Briet, R., Buey, J.-T., Butler, B., Cailleau, D., Cautain, R., Chabaud, P.-Y., Chaintreuil, S., Chiavassa, F., Costes, V., Cuna Parrho, V., De Oliveira Fialho, F., Decaudin, M., Defise, J.-M., Djalal, S., Epstein, G., Exil, G.-E., Fauré, C., Fenouillet, T., Gaboriaud, A., Gallic, A., Gamet, P., Gavalda, P., Grolleau, E., Gruneisen, R., Gueguen, L., Guis, V., Guivarc'h, V., Guterman, P., Hallouard, D., Hasiba, J., Heuripeau, F., Huntzinger, G., Hustaix, H., Imad, C., Imbert, C., Johlander, B., Jouret, M., Journoud, P., Karioty, F., Kerjean, L., Lafaille, V., Lafond, L., Lam-Trong, T., Landiech, P., Lapeyrere, V., Larqué, T., Laudet, P., Lautier, N., Lecann, H., Lefevre, L., Leruyet, B., Levacher, P., Magnan, A., Mazy, E., Mertens, F., Mesnager, J.-M., Meunier, J.-C., Michel, J.-P., Monjoin, W., Naudet, D., Nguyen-Kim, K., Orcesi, J.-L., Ottacher, H., Perez, R., Peter, G., Plasson, P., Plesseria, J.-Y., Pontet, B., Pradines, A., Quentin, C., Reynaud, J.-L., Rolland, G., Rollenhagen, F., Romagnan, R., Russ, N., Schmidt, R., Schwartz, N., Sebbag, I., Sedes, G., Smit, H., Steller, M. B., Sunter, W., Surace, C., Tello, M., Tiphène, D., Toulouse, P., Ulmer, B., Vandermarcq, O., Vergnault, E., Vuillemin, A., and Zanatta, P.

Abstract

Aims. We report the discovery of very shallow ($\Delta F/F \approx 3.4\times 10^{-4}$), periodic dips in the light curve of an active $V = 11.7$G9V star observed by the CoRoT  satellite, which we interpret as caused by a transiting companion. We describe the 3-colour CoRoT data and complementary ground-based observations that support the planetary nature of the companion.

Published
2009
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15. Removing systematics from the CoRoT light curves*

Author

Mazeh, T., Guterman, P., Aigrain, S., Zucker, S., Grinberg, N., Alapini, A., Alonso, R., Auvergne, M., Barbieri, M., Barge, P., Bordé, P., Bouchy, F., Deeg, H., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gondoin, P., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Rouan, D., Sabo, R., Schneider, J., Wuchterl, G., Mazeh, T., Guterman, P., Aigrain, S., Zucker, S., Grinberg, N., Alapini, A., Alonso, R., Auvergne, M., Barbieri, M., Barge, P., Bordé, P., Bouchy, F., Deeg, H., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gondoin, P., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Rouan, D., Sabo, R., Schneider, J., and Wuchterl, G.

Abstract

This paper presents an analysis that searched for systematic effects within the CoRoT exoplanet field light curves. The analysis identified a systematic effect that modified the zero point of most CoRoT exposures as a function of stellar magnitude. We could find this effect only after preparing a set of learning light curves that were relatively free of stellar and instrumental noise. Correcting for this effect, rejecting outliers that appear in almost every exposure, and applying SysRem, reduced the stellar RMS by about 20%, without attenuating transit signals.

Published
2009
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16. Accuracy of stellar parameters of exoplanet-host stars determined from asteroseismology

Author

Mulet-Marquis, C., Baraffe, I., Aigrain, S., Pont, F., Mulet-Marquis, C., Baraffe, I., Aigrain, S., and Pont, F.

Abstract

Context. In the context of the space-based mission CoRoT, devoted to asteroseismology and search for planet transits, we analyse the accuracy of fundamental stellar parameters (mass, radius, luminosity) that can be obtained from asteroseismological data.

Published
2009
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17. The secondary eclipse of CoRoT-1b*

Author

Alonso, R., Alapini, A., Aigrain, S., Auvergne, M., Baglin, A., Barbieri, M., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Chaintreuil, S., De la Reza, R., Deeg, H. J., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., De Oliveira Fialho, F., Gondoin, P., Guillot, T., Hatzes, A., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Rouan, D., Schneider, J., Wuchterl, G., Alonso, R., Alapini, A., Aigrain, S., Auvergne, M., Baglin, A., Barbieri, M., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Chaintreuil, S., De la Reza, R., Deeg, H. J., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., De Oliveira Fialho, F., Gondoin, P., Guillot, T., Hatzes, A., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Rouan, D., Schneider, J., and Wuchterl, G.

Abstract

The transiting planet CoRoT-1b is thought to belong to the pM-class of planets, in which the thermal emission dominates in the optical wavelengths. We present a detection of its secondary eclipse in the CoRoT white channel data, whose response function goes from ~400 to ~1000 nm. We used two different filtering approaches, and several methods to evaluate the significance of a detection of the secondary eclipse. We detect a secondary eclipse centered within 20 min at the expected times for a circular orbit, with a depth of $0.016 \pm 0.006$%. The center of the eclipse is translated in a 1-σupper limit to the planet's eccentricity of $e\cos\omega< 0.014$. Under the assumption of a zero Bond Albedo and blackbody emission from the planet, it corresponds to a $T_{\rm CoRoT} = 2330^{+120}_{-140}$K. We provide the equilibrium temperatures of the planet as a function of the amount of reflected light. If the planet is in thermal equilibrium with the incident flux from the star, our results imply an inefficient transport mechanism of the flux from the day to the night sides.

Published
2009
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18. Noise properties of the CoRoT data*

Author

Aigrain, S., Pont, F., Fressin, F., Alapini, A., Alonso, R., Auvergne, M., Barbieri, M., Barge, P., Bordé, P., Bouchy, F., Deeg, H., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gondoin, P., Guterman, P., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Queloz, D., Rauer, H., Rouan, D., Schneider, J., Wuchter, G., Zucker, S., Aigrain, S., Pont, F., Fressin, F., Alapini, A., Alonso, R., Auvergne, M., Barbieri, M., Barge, P., Bordé, P., Bouchy, F., Deeg, H., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gondoin, P., Guterman, P., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Queloz, D., Rauer, H., Rouan, D., Schneider, J., Wuchter, G., and Zucker, S.

Abstract

In this short paper, we study the photometric precision of stellar light curves obtained by the CoRoT satellite in its planet-finding channel, with a particular emphasis on the time scales characteristic of planetary transits. Together with other articles in the same issue of this journal, it forms an attempt to provide the building blocks for a statistical interpretation of the CoRoT planet and eclipsing binary catch to date. After pre-processing the light curves so as to minimise long-term variations and outliers, we measure the scatter of the light curves in the first three CoRoT runs lasting more than 1 month, using an iterative non-linear filter to isolate signal on the time scales of interest. The behaviour of the noise on 2 h time scales is described well by a power-law with index 0.25 in R-magnitude, ranging from 0.1 mmag at $R=11.5$to 1 mmag at $R=16$, which is close to the pre-launch specification, though still a factor 2-3 above the photon noise due to residual jitter noise and hot pixel events. There is evidence of slight degradation in the performance over time. We find clear evidence of enhanced variability on hour time scales (at the level of 0.5 mmag) in stars identified as likely giants from their Rmagnitude and $B-V$colour, which represent approximately 60 and 20% of the observed population in the directions of Aquila and Monoceros, respectively. On the other hand, median correlated noise levels over 2 h for dwarf stars are extremely low, reaching 0.05 mmag at the bright end.

Published
2009
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19. Photospheric activity and rotation of the planet-hosting star CoRoT-4a*

Author

Lanza, A. F., Aigrain, S., Messina, S., Leto, G., Pagano, I., Auvergne, M., Baglin, A., Barge, P., Bonomo, A. S., Collier Cameron, A., Cutispoto, G., Deleuil, M., De Medeiros, J. R., Foing, B., Moutou, C., Lanza, A. F., Aigrain, S., Messina, S., Leto, G., Pagano, I., Auvergne, M., Baglin, A., Barge, P., Bonomo, A. S., Collier Cameron, A., Cutispoto, G., Deleuil, M., De Medeiros, J. R., Foing, B., and Moutou, C.

Abstract

Aims. The space experiment CoRoT has recently detected a transiting hot Jupiter in orbit around a moderately active F-type main-sequence star (CoRoT-4a). This planetary system is of particular interest because it has an orbital period of 9.202 days, the second longest one among the transiting planets known to date. We study the surface rotation and the activity of the host star during an uninterrupted sequence of optical observations of 58 days.

Published
2009
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20. Planetary transit candidates in CoRoT-LRc01 field *

Author

Cabrera, J., Fridlund, M., Ollivier, M., Gandolfi, D., Csizmadia, Sz., Alonso, R., Aigrain, S., Alapini, A., Almenara, J.-M., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Bruntt, H., Carone, L., Carpano, S., Deeg, H. J., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Gillon, M., Gondoin, P., Guenther, E. W., Guillot, T., Hartmann, M., Hatzes, A., Hebrard, G., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Lovis, C., Magain, P., Mayor, M., Mazeh, T., Moutou, C., Ofir, A., Pätzold, M., Pepe, F., Pont, F., Queloz, D., Rabus, M., Rauer, H., Régulo, C., Renner, S., Rouan, D., Samuel, B., Santerne, A., Schneider, J., Shporer, A., Stecklum, B., Tingley, B., Udry, S., Wuchterl, G., Cabrera, J., Fridlund, M., Ollivier, M., Gandolfi, D., Csizmadia, Sz., Alonso, R., Aigrain, S., Alapini, A., Almenara, J.-M., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Bruntt, H., Carone, L., Carpano, S., Deeg, H. J., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Gillon, M., Gondoin, P., Guenther, E. W., Guillot, T., Hartmann, M., Hatzes, A., Hebrard, G., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Lovis, C., Magain, P., Mayor, M., Mazeh, T., Moutou, C., Ofir, A., Pätzold, M., Pepe, F., Pont, F., Queloz, D., Rabus, M., Rauer, H., Régulo, C., Renner, S., Rouan, D., Samuel, B., Santerne, A., Schneider, J., Shporer, A., Stecklum, B., Tingley, B., Udry, S., and Wuchterl, G.

Abstract

Aims. We present here the list of planetary transit candidates detected in the first long run observed by CoRoT: LRc01, towards the galactic center in the direction of Aquila, which lasted from May to October 2007.

Published
2009
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21. Planetary transit candidates in Corot-IRa01 field *

Author

Carpano, S., Cabrera, J., Alonso, R., Barge, P., Aigrain, S., Almenara, J.-M., Bordé, P., Bouchy, F., Carone, L., Deeg, H. J., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fressin, F., Fridlund, M., Gondoin, P., Guillot, T., Hatzes, A., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Moutou, C., Ofir, A., Ollivier, M., Janot-Pacheco, E., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Régulo, C., Renner, S., Rouan, D., Samuel, B., Schneider, J., Wuchterl, G., Carpano, S., Cabrera, J., Alonso, R., Barge, P., Aigrain, S., Almenara, J.-M., Bordé, P., Bouchy, F., Carone, L., Deeg, H. J., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fressin, F., Fridlund, M., Gondoin, P., Guillot, T., Hatzes, A., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Moutou, C., Ofir, A., Ollivier, M., Janot-Pacheco, E., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Régulo, C., Renner, S., Rouan, D., Samuel, B., Schneider, J., and Wuchterl, G.

Abstract

Context. CoRoT is a pioneering space mission devoted to the analysis of stellar variability and the photometric detection of extrasolar planets.

Published
2009
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22. Transiting exoplanets from the CoRoT space mission*

Author

Rauer, H., Queloz, D., Csizmadia, Sz., Deleuil, M., Alonso, R., Aigrain, S., Almenara, J. M., Auvergne, M., Baglin, A., Barge, P., Bordé, P., Bouchy, F., Bruntt, H., Cabrera, J., Carone, L., Carpano, S., De la Reza, R., Deeg, H. J., Dvorak, R., Erikson, A., Fridlund, M., Gandolfi, D., Gillon, M., Guillot, T., Guenther, E., Hatzes, A., Hébrard, G., Kabath, P., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Rabus, M., Renner, S., Rouan, D., Shporer, A., Samuel, B., Schneider, J., Triaud, A. H. M. J., Wuchterl, G., Rauer, H., Queloz, D., Csizmadia, Sz., Deleuil, M., Alonso, R., Aigrain, S., Almenara, J. M., Auvergne, M., Baglin, A., Barge, P., Bordé, P., Bouchy, F., Bruntt, H., Cabrera, J., Carone, L., Carpano, S., De la Reza, R., Deeg, H. J., Dvorak, R., Erikson, A., Fridlund, M., Gandolfi, D., Gillon, M., Guillot, T., Guenther, E., Hatzes, A., Hébrard, G., Kabath, P., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Rabus, M., Renner, S., Rouan, D., Shporer, A., Samuel, B., Schneider, J., Triaud, A. H. M. J., and Wuchterl, G.

Abstract

Aims. The CoRoT space mission continues to photometrically monitor about 12 000 stars in its field-of-view for a series of target fields to search for transiting extrasolar planets ever since 2007. Deep transit signals can be detected quickly in the “alarm-mode” in parallel to the ongoing target field monitoring. CoRoT's first planets have been detected in this mode.

Published
2009
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23. Planetary transit candidates in the CoRoT initial run: resolving their nature ***

Author

Moutou, C., Pont, F., Bouchy, F., Deleuil, M., Almenara, J. M., Alonso, R., Barbieri, M., Bruntt, H., Deeg, H. J., Fridlund, M., Gandolfi, D., Gillon, M., Guenther, E., Hatzes, A., Hébrard, G., Loeillet, B., Mayor, M., Mazeh, T., Queloz, D., Rabus, M., Rouan, D., Shporer, A., Udry, S., Aigrain, S., Auvergne, M., Baglin, A., Barge, P., Benz, W., Bordé, P., Carpano, S., De la Reza, R., Dvorak, R., Erikson, A., Gondoin, P., Guillot, T., Jorda, L., Kabath, P., Lammer, H., Léger, A., Llebaria, A., Lovis, C., Magain, P., Ollivier, M., Pätzold, M., Pepe, F., Rauer, H., Schneider, J., Wuchterl, G., Moutou, C., Pont, F., Bouchy, F., Deleuil, M., Almenara, J. M., Alonso, R., Barbieri, M., Bruntt, H., Deeg, H. J., Fridlund, M., Gandolfi, D., Gillon, M., Guenther, E., Hatzes, A., Hébrard, G., Loeillet, B., Mayor, M., Mazeh, T., Queloz, D., Rabus, M., Rouan, D., Shporer, A., Udry, S., Aigrain, S., Auvergne, M., Baglin, A., Barge, P., Benz, W., Bordé, P., Carpano, S., De la Reza, R., Dvorak, R., Erikson, A., Gondoin, P., Guillot, T., Jorda, L., Kabath, P., Lammer, H., Léger, A., Llebaria, A., Lovis, C., Magain, P., Ollivier, M., Pätzold, M., Pepe, F., Rauer, H., Schneider, J., and Wuchterl, G.

Abstract

With the release of CoRoT lightcurves of the Initial Run IRa01, 50 transiting planetary candidates have been published in a companion paper. About twenty of them were identified as binary stars from the CoRoT lightcurve itself. Complementary observations were conducted for 29 candidates, including ground-based photometry and radial-velocity measurements. Two giant planets were identified and fully characterized. Nineteen binaries are recognized, from which 10 are background eclipsing binaries in the CoRoT mask or triple systems, diluted by the main CoRoT target. Eight cases remain of unclear origin, one of them still being a planetary candidate. Comparison with simulations shows that the actual threshold of confirmed planet detection in this field does not yet fulfill the expectations, and a number of reasons are invoked, like the ranking process based on lightcurve analyses, and the strategy and limits of follow-up observations for targets fainter than magnitude 15.

Published
2009
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24. Rate and nature of false positives in the CoRoT exoplanet search*

Author

Almenara, J. M., Deeg, H. J., Aigrain, S., Alonso, R., Auvergne, M., Baglin, A., Barbieri, M., Barge, P., Bordé, P., Bouchy, F., Bruntt, H., Cabrera, J., Carone, L., Carpano, S., Catala, C., Csizmadia, Sz., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gandolfi, D., Gillon, M., Gondoin, P., Guenther, E., Guillot, T., Hatzes, A., Hébrard, G., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Loeillet, B., Magain, P., Mayor, M., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Régulo, C., Renner, S., Rouan, D., Samuel, B., Schneider, J., Shporer, A., Wuchterl, G., Zucker, S., Almenara, J. M., Deeg, H. J., Aigrain, S., Alonso, R., Auvergne, M., Baglin, A., Barbieri, M., Barge, P., Bordé, P., Bouchy, F., Bruntt, H., Cabrera, J., Carone, L., Carpano, S., Catala, C., Csizmadia, Sz., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gandolfi, D., Gillon, M., Gondoin, P., Guenther, E., Guillot, T., Hatzes, A., Hébrard, G., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Loeillet, B., Magain, P., Mayor, M., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Régulo, C., Renner, S., Rouan, D., Samuel, B., Schneider, J., Shporer, A., Wuchterl, G., and Zucker, S.

Abstract

Context. The CoRoT satellite searches for planets by applying the transit method, monitoring up to 12 000 stars in the galactic plane for 150 days in each observing run. This search is contaminated by a large fraction of false positives, caused by different eclipsing binary configurations that might be confused with a transiting planet.

Published
2009
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25. Ground-based photometry of space-based transit detections: photometric follow-up of the CoRoT  mission *

Author

Deeg, H. J., Gillon, M., Shporer, A., Rouan, D., Stecklum, B., Aigrain, S., Alapini, A., Almenara, J. M., Alonso, R., Barbieri, M., Bouchy, F., Eislöffel, J., Erikson, A., Fridlund, M., Eigmüller, P., Handler, G., Hatzes, A., Kabath, P., Lendl, M., Mazeh, T., Moutou, C., Queloz, D., Rauer, H., Rabus, M., Tingley, B., Titz, R., Deeg, H. J., Gillon, M., Shporer, A., Rouan, D., Stecklum, B., Aigrain, S., Alapini, A., Almenara, J. M., Alonso, R., Barbieri, M., Bouchy, F., Eislöffel, J., Erikson, A., Fridlund, M., Eigmüller, P., Handler, G., Hatzes, A., Kabath, P., Lendl, M., Mazeh, T., Moutou, C., Queloz, D., Rauer, H., Rabus, M., Tingley, B., and Titz, R.

Abstract

The motivation, techniques and performance of the ground-based photometric follow-up of transit detections by the CoRoT space mission are presented. Its principal raison d'êtrearises from the much higher spatial resolution of common ground-based telescopes in comparison to CoRoT's cameras. This allows the identification of many transit candidates as arising from eclipsing binaries that are contaminating CoRoT's lightcurves, even in low-amplitude transit events that cannot be detected with ground-based obervations. For the ground observations, “on” – “off” photometry is now largely employed, in which only a short timeseries during a transit and a section outside a transit is observed and compared photometrically. CoRoTplanet candidates' transits are being observed by a dedicated team with access to telescopes with sizes ranging from 0.2 to 2 m. As an example, the process that led to the rejection of contaminating eclipsing binaries near the host star of the Super-Earth planet CoRoT-7b is shown. Experiences and techniques from this work may also be useful for other transit-detection experiments, when the discovery instrument obtains data with a relatively low angular resolution.

Published
2009
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26. Spin-orbit misalignment in the HD 80606 planetary system ***

Author

Pont, F., Hébrard, G., Irwin, J. M., Bouchy, F., Moutou, C., Ehrenreich, D., Guillot, T., Aigrain, S., Bonfils, X., Berta, Z., Boisse, I., Burke, C., Charbonneau, D., Delfosse, X., Desort, M., Eggenberger, A., Forveille, T., Lagrange, A.-M., Lovis, C., Nutzman, P., Pepe, F., Perrier, C., Queloz, D., Santos, N. C., Ségransan, D., Udry, S., Vidal-Madjar, A., Pont, F., Hébrard, G., Irwin, J. M., Bouchy, F., Moutou, C., Ehrenreich, D., Guillot, T., Aigrain, S., Bonfils, X., Berta, Z., Boisse, I., Burke, C., Charbonneau, D., Delfosse, X., Desort, M., Eggenberger, A., Forveille, T., Lagrange, A.-M., Lovis, C., Nutzman, P., Pepe, F., Perrier, C., Queloz, D., Santos, N. C., Ségransan, D., Udry, S., and Vidal-Madjar, A.

Abstract

We recently reported the photometric and spectroscopic detection of the primary transit of the 111-day-period, eccentric extra-solar planet HD 80606b, at Observatoire de Haute-Provence, France. The whole egress of the primary transit and a section of its central part were observed, allowing the measurement of the planetary radius, and evidence for a spin-orbit misalignment through the observation of the Rossiter-McLaughlin anomaly. The ingress not having been observed for this long-duration transit, uncertainties remained in the parameters of the system. We present here a refined, combined analysis of our photometric and spectroscopic data, together with further published radial velocities, ground-based photometry, and Spitzerphotometry around the secondary eclipse, as well as new photometric measurements of HD 80606 acquired at Mount Hopkins, Arizona, just before the beginning of the primary transit. Although the transit is not detected in those new data, they provide an upper limit for the transit duration, which narrows down the possible behaviour of the Rossiter-McLaughlin anomaly in the unobserved part of the transit. We analyse the whole data with a Bayesian approach using a Markov-chain Monte Carlo integration on all available information. We find $R_{\rm p} = 0.98 \pm 0.03 \,{R}_{\rm Jup}$for the planetary radius, and a total primary transit duration of $11.9 \pm 1.3$h from first to fourth contact. Our analysis reinforces the hypothesis of spin-orbit misalignment in this system (alignment excluded at >95% level), with a positive projected angle between the planetary orbital axis and the stellar rotation (median solution $\lambda \sim 50^\circ$). As HD 80606 is a component of a binary system, the peculiar orbit of its planet could result from a Kozai mechanism.

Published
2009
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27. Modelling solar-like variability for the detection of Earth-like planetary transits

Author

Bonomo, A. S., Aigrain, S., Bordé, P., Lanza, A. F., Bonomo, A. S., Aigrain, S., Bordé, P., and Lanza, A. F.

Abstract

Aims. As an extension of a previous work, we present a comparison of four methods of filtering solar-like variability to increase the efficiency of detection of Earth-like planetary transits by means of box-shaped transit finder algorithms. Two of these filtering methods are the harmonic fitting method and the iterative nonlinear filter that, coupled respectively with the box least-square (BLS) and box maximum likelihood algorithms, demonstrated the best performance during the first detection blind test organised inside the CoRoT consortium. The third method, the 3-spot model, is a simplified physical model of Sun-like variability and the fourth is a simple sliding boxcar filter.

Published
2009
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28. Magnetic activity in the photosphere of CoRoT-Exo-2a*

Author

Lanza, A. F., Pagano, I., Leto, G., Messina, S., Aigrain, S., Alonso, R., Auvergne, M., Baglin, A., Barge, P., Bonomo, A. S., Boumier, P., Collier Cameron, A., Comparato, M., Cutispoto, G., De Medeiros, J. R., Foing, B., Kaiser, A., Moutou, C., Parihar, P. S., Silva-Valio, A., Weiss, W. W., Lanza, A. F., Pagano, I., Leto, G., Messina, S., Aigrain, S., Alonso, R., Auvergne, M., Baglin, A., Barge, P., Bonomo, A. S., Boumier, P., Collier Cameron, A., Comparato, M., Cutispoto, G., De Medeiros, J. R., Foing, B., Kaiser, A., Moutou, C., Parihar, P. S., Silva-Valio, A., and Weiss, W. W.

Abstract

Context. The space experiment CoRoT has recently detected transits by a hot Jupiter across the disc of an active G7V star (CoRoT-Exo-2a) that can be considered as a good proxy for the Sun at an age of approximately 0.5 Gyr.

Published
2009
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29. Transiting exoplanets from the CoRoTspace mission ***

Author

Deleuil, M., Deeg, H. J., Alonso, R., Bouchy, F., Rouan, D., Auvergne, M., Baglin, A., Aigrain, S., Almenara, J. M., Barbieri, M., Barge, P., Bruntt, H., Bordé, P., Collier Cameron, A., Csizmadia, Sz., De la Reza, R., Dvorak, R., Erikson, A., Fridlund, M., Gandolfi, D., Gillon, M., Guenther, E., Guillot, T., Hatzes, A., Hébrard, G., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Loeillet, B., Mayor, M., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Schneider, J., Shporer, A., Wuchterl, G., Zucker, S., Deleuil, M., Deeg, H. J., Alonso, R., Bouchy, F., Rouan, D., Auvergne, M., Baglin, A., Aigrain, S., Almenara, J. M., Barbieri, M., Barge, P., Bruntt, H., Bordé, P., Collier Cameron, A., Csizmadia, Sz., De la Reza, R., Dvorak, R., Erikson, A., Fridlund, M., Gandolfi, D., Gillon, M., Guenther, E., Guillot, T., Hatzes, A., Hébrard, G., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Loeillet, B., Mayor, M., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Schneider, J., Shporer, A., Wuchterl, G., and Zucker, S.

Abstract

Context. The CoRoTspace mission routinely provides high-precision photometric measurements of thousands of stars that have been continuously observed for months.

Published
2008
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30. Transiting exoplanets from the CoRoT space mission***

Author

Moutou, C., Bruntt, H., Guillot, T., Shporer, A., Guenther, E., Aigrain, S., Almenara, J. M., Alonso, R., Auvergne, M., Baglin, A., Barbieri, M., Barge, P., Benz, W., Bordé, P., Bouchy, F., Deeg, H. J., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gillon, M., Gondoin, P., Hatzes, A., Hébrard, G., Jorda, L., Kabath, P., Lammer, H., Léger, A., Llebaria, A., Loeillet, B., Magain, P., Mayor, M., Mazeh, T., Ollivier, M., Pätzold, M., Pepe, F., Pont, F., Queloz, D., Rabus, M., Rauer, H., Rouan, D., Schneider, J., Udry, S., Wuchterl, G., Moutou, C., Bruntt, H., Guillot, T., Shporer, A., Guenther, E., Aigrain, S., Almenara, J. M., Alonso, R., Auvergne, M., Baglin, A., Barbieri, M., Barge, P., Benz, W., Bordé, P., Bouchy, F., Deeg, H. J., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gillon, M., Gondoin, P., Hatzes, A., Hébrard, G., Jorda, L., Kabath, P., Lammer, H., Léger, A., Llebaria, A., Loeillet, B., Magain, P., Mayor, M., Mazeh, T., Ollivier, M., Pätzold, M., Pepe, F., Pont, F., Queloz, D., Rabus, M., Rauer, H., Rouan, D., Schneider, J., Udry, S., and Wuchterl, G.

Abstract

Aims. The CoRoT satellite has announced its fourth transiting planet (Aigrain et al. 2008, A&A, 488, L43) with space photometry. We describe and analyse complementary observations of this system performed to establish the planetary nature of the transiting body and to estimate the fundamental parameters of the planet and its parent star.

Published
2008
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31. Transiting exoplanets from the CoRoT space mission***

Author

Aigrain, S., Collier Cameron, A., Ollivier, M., Pont, F., Jorda, L., Almenara, J. M., Alonso, R., Barge, P., Bordé, P., Bouchy, F., Deeg, H., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gondoin, P., Gillon, M., Guillot, T., Hatzes, A., Lammer, H., Lanza, A. F., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Paetzold, M., Pinte, C., Queloz, D., Rauer, H., Rouan, D., Schneider, J., Wuchter, G., Zucker, S., Aigrain, S., Collier Cameron, A., Ollivier, M., Pont, F., Jorda, L., Almenara, J. M., Alonso, R., Barge, P., Bordé, P., Bouchy, F., Deeg, H., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gondoin, P., Gillon, M., Guillot, T., Hatzes, A., Lammer, H., Lanza, A. F., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Paetzold, M., Pinte, C., Queloz, D., Rauer, H., Rouan, D., Schneider, J., Wuchter, G., and Zucker, S.

Abstract

CoRoT, the first space-based transit search, provides ultra-high-precision light curves with continuous time-sampling over periods of up to 5 months. This allows the detection of transiting planets with relatively long periods, and the simultaneous study of the host star's photometric variability. In this Letter, we report the discovery of the transiting giant planet CoRoT-Exo-4b and use the CoRoT light curve to perform a detailed analysis of the transit and determine the stellar rotation period. The CoRoT light curve was pre-processed to remove outliers and correct for orbital residuals and artefacts due to hot pixels on the detector. After removing stellar variability about each transit, the transit light curve was analysed to determine the transit parameters. A discrete autocorrelation function method was used to derive the rotation period of the star from the out-of-transit light curve. We determine the periods of the planetary orbit and star's rotation of 9.20205 ±0.00037 and 8.87 ±1.12 days respectively, which is consistent with this being a synchronised system. We also derive the inclination, $i = 90.00_{\rm -0.085}^{+0.000}$in degrees, the ratio of the orbital distance to the stellar radius, $a/R_{\rm s} = 17.36_{-0.25}^{+0.05}$, and the planet-to-star radius ratio $R_{\rm p}/R_{\rm s}=0.1047_{-0.0022}^{+0.0041}$. We discuss briefly the coincidence between the orbital period of the planet and the stellar rotation period and its possible implications for the system's migration and star-planet interaction history.

Published
2008
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32. Transiting exoplanets from the CoRoT space mission*

Author

Bouchy, F., Queloz, D., Deleuil, M., Loeillet, B., Hatzes, A. P., Aigrain, S., Alonso, R., Auvergne, M., Baglin, A., Barge, P., Benz, W., Bordé, P., Deeg, H. J., De la Reza, R., Dvorak, R., Erikson, A., Fridlund, M., Gondoin, P., Guillot, T., Hébrard, G., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Mayor, M., Moutou, C., Ollivier, M., Pätzold, M., Pepe, F., Pont, F., Rauer, H., Rouan, D., Schneider, J., Triaud, A. H. M. J., Udry, S., Wuchterl, G., Bouchy, F., Queloz, D., Deleuil, M., Loeillet, B., Hatzes, A. P., Aigrain, S., Alonso, R., Auvergne, M., Baglin, A., Barge, P., Benz, W., Bordé, P., Deeg, H. J., De la Reza, R., Dvorak, R., Erikson, A., Fridlund, M., Gondoin, P., Guillot, T., Hébrard, G., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Mayor, M., Moutou, C., Ollivier, M., Pätzold, M., Pepe, F., Pont, F., Rauer, H., Rouan, D., Schneider, J., Triaud, A. H. M. J., Udry, S., and Wuchterl, G.

Abstract

We report on the spectroscopic transit of the massive hot-Jupiter CoRoT-Exo-2b observed with the high-precision spectrographs SOPHIE and HARPS. By modeling the radial velocity anomaly occurring during the transit due to the Rossiter-McLaughlin (RM) effect, we determine the sky-projected angle between the stellar spin and the planetary orbital axis to be close to zero λ= 7.2 ±4.5 deg, and we secure the planetary nature of CoRoT-Exo-2b. We discuss the influence of the stellar activity on the RM modeling. Spectral analysis of the parent star from HARPS spectra are presented.

Published
2008
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33. Characterising stellar micro-variability for planetary transit searches

Author

Aigrain, S., Favata, F., Gilmore, G., Aigrain, S., Favata, F., and Gilmore, G.

Abstract

A method for simulating light curves containing stellar micro-variability for a range of spectral types and ages is presented. It is based on parameter-by-parameter scaling of a multi-component fit to the solar irradiance power spectrum (based on VIRGO/PMO6 data), and scaling laws derived from ground based observations of various stellar samples.
A correlation is observed in the Sun between the amplitude of the power spectrum on long (weeks) timescales and the BBSO Ca iiK-line index of chromospheric activity. On the basis of this evidence, the chromospheric activity level, predicted from rotation period and $B-V$colour estimates according to the relationship first introduced by [CITE] and [CITE], is used to predict the variability power on weeks time scales. The rotation period is estimated on the basis of a fit to the distribution of rotation period versus $B-V$observed in the Hyades and the [CITE] spin-down law. The characteristic timescale of the variability is also scaled according to the rotation period.
This model is used to estimate the impact of the target star spectral type and age on the detection capability of space based transit searches such as Eddingtonand Kepler. K stars are found to be the most promising targets, while the performance drops significantly for stars earlier than G and younger than 2.0 Gyr. Simulations also show that Eddingtonshould detect terrestrial planets orbiting solar-age stars in most of the habitable zone for G2 types and all of it for K0 and K5 types.

Published
2004
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34. Detecting planetary transits in the presence of stellar variability

Author

Carpano, S., Aigrain, S., Favata, F., Carpano, S., Aigrain, S., and Favata, F.

Abstract

Space-based photometric transit searches, such as the ESA mission Eddington(planned for launch in 2007), are expected to detect large numbers of terrestrial planets outside the solar system, including some Earth-like planets. Combining simplicity of concept with efficiency, the transit method consists in detecting the periodic luminosity drop in stellar light curves caused by the transit of a planet in front of its parent star. In a previous paper (Aigrain & Favata [CITE], hereafter Paper I), we developed a Bayesian transit detection algorithm and evaluated its performance on simulated light curves dominated by photon noise. In this paper, we examine the impact of intrinsic stellar variability. Running the algorithm on light curves with added stellar variability (constructed using data from the VIRGO/PMO6 instrument on board SoHO) demonstrated the need for pre-processing to remove the stellar noise. We have developed an effective variability filter, based on an ad-hoc optimal approach, and run extensive simulations to test the filter and detection algorithm combination for a range of stellar magnitudes and activity levels. These show that activity levels up to solar maximum are not an obstacle to habitable planet detection. We also evaluated the benefits of using colour information in the detection process, and concluded that in the case of Eddingtonthey are outweighed by the implied loss of photometric accuracy.

Published
2003
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35. Bayesian detection of planetary transits

Author

Aigrain, S., Favata, F., Aigrain, S., and Favata, F.

Abstract

The detection of planetary transits in stellar photometric light-curves is poised to become the main method for finding substantial numbers of terrestrial planets. The French-European mission COROT (foreseen for launch in 2005) will perform the first search on a limited number of stars, and larger missions Eddington(from ESA) and Kepler(from NASA) are planned for launch in 2007. Transit signals from terrestrial planets are small ($\Delta F/F \simeq 10^{-4}$), short ($\Delta t\simeq 10$hours) dips, which repeat with periodicity of a few months, in time series lasting up to a few years. The reliable and automated detection of such signals in large numbers of light curves affected by different sources of noise is a statistical and computational challenge. We present a novel algorithm based on a Bayesian approach. The algorithm is based on the Gregory-Loredo method originally developed for the detection of pulsars in X-ray data. In the present paper the algorithm is presented, and its performance on simulated data sets dominated by photon noise is explored. In an upcoming paper the influence of additional noise sources (such as stellar activity) will be discussed.

Published
2002
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36. The secondary eclipse of the transiting exoplanet CoRoT-2b

Author

Alonso, R., Guillot, T., Mazeh, T., Aigrain, S., Alapini, A., Barge, P., Hatzes, A., and Pont, F.

Abstract

We present a study of the light curve of the transiting exoplanet CoRoT-2b, aimed at detecting the secondary eclipse and measuring its depth. The data were obtained with the CoRoT satellite during its first run of more than 140?days. After filtering the low frequencies with a pre-whitening technique, we detect a 0.0060?0.0020% secondary eclipse centered on the orbital phase 0.494?0.006. Assuming a black-body emission of the planet, we estimate a surface brightness temperature of Tp,CoRoT=1910+90-100?K. We provide the planet's equilibrium temperature and re-distribution factors as a function of the unknown amount of reflected light. The upper limit for the geometric albedo is?0.12. The detected secondary is the shallowest ever found.

Published
2009

37. CoRoT LRa02_E2_0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary⋆

Author

Tal-Or, L., Santerne, A., Mazeh, T., Bouchy, F., Moutou, C., Alonso, R., Gandolfi, D., Aigrain, S., Auvergne, M., Barge, P., Bonomo, A. S., Bordé, P., Deeg, H., Ferraz-Mello, S., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gillon, M., Guenther, E. W., Guillot, T., Hatzes, A., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Ollivier, M., Pätzold, M., Queloz, D., Rauer, H., Rouan, D., Tsodikovich, Y., and Wuchterl, G.

Abstract

This paper presents the case of CoRoT LRa02_E2_0121, which was initially classified as a Neptune-size transiting-planet candidate on a relatively wide orbit of 36.3 days. Follow-up observations were performed with UVES, Sandiford, SOPHIE, and HARPS. These observations revealed a faint companion in the spectra. To find the true nature of the system we derived the radial velocities of the faint companion using TODMOR – a two-dimensional correlation technique, applied to the SOPHIE spectra. Modeling the lightcurve with EBAS we discovered a secondary eclipse with a depth of  ~0.07%, indicating a diluted eclipsing binary. Combined MCMC modeling of the lightcurve and the radial velocities suggested that CoRoT LRa02_E2_0121 is a hierarchical triple system with an evolved G-type primary and an A-type:F-type grazing eclipsing binary. Such triple systems are difficult to discover.

Published
2011
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38. Transiting exoplanets from the CoRoT space mission⋆⋆⋆

Author

Hébrard, G., Evans, T. M., Alonso, R., Fridlund, M., Ofir, A., Aigrain, S., Guillot, T., Almenara, J. M., Auvergne, M., Baglin, A., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Cabrera, J., Carone, L., Carpano, S., Cavarroc, C., Csizmadia, Sz., Deeg, H. J., Deleuil, M., Díaz, R. F., Dvorak, R., Erikson, A., Ferraz-Mello, S., Gandolfi, D., Gibson, N., Gillon, M., Guenther, E., Hatzes, A., Havel, M., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Mazeh, T., Moutou, C., Ollivier, M., Parviainen, H., Pätzold, M., Queloz, D., Rauer, H., Rouan, D., Santerne, A., Schneider, J., Tingley, B., and Wuchterl, G.

Abstract

We report the detection of CoRoT-18b, a massive hot Jupiter transiting in front of its host star with a period of 1.9000693 ± 0.0000028 days. This planet was discovered thanks to photometric data secured with the CoRoT satellite combined with spectroscopic and photometric ground-based follow-up observations. The planet has a mass Mp= 3.47 ± 0.38 MJup, a radius Rp= 1.31 ± 0.18 RJup, and a density ρp= 2.2 ± 0.8 g cm-3. It orbits a G9V star with a mass M⋆= 0.95 ± 0.15   M⊙, a radius R⋆= 1.00 ± 0.13   R⊙, and arotation period Prot= 5.4 ± 0.4 days. The age of the system remains uncertain, with stellar evolution models pointing either to a few tens Ma or several Ga, while gyrochronology and lithium abundance point towards ages of a few hundred Ma. This mismatch potentially points to a problem in our understanding of the evolution of young stars, with possibly significant implications for stellar physics and the interpretation of inferred sizes of exoplanets around young stars. We detected the Rossiter-McLaughlin anomaly in the CoRoT-18 system thanks to the spectroscopic observation of a transit. We measured the obliquity ψ= 20° ± 20° (sky-projected value λ= −10° ± 20°), indicating that the planet orbits in the same way as the star is rotating and that this prograde orbit is nearly aligned with the stellar equator.

Published
2011
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39. Transiting exoplanets from the CoRoT space mission⋆

Author

Csizmadia, Sz., Moutou, C., Deleuil, M., Cabrera, J., Fridlund, M., Gandolfi, D., Aigrain, S., Alonso, R., Almenara, J.-M., Auvergne, M., Baglin, A., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Bruntt, H., Carone, L., Carpano, S., Cavarroc, C., Cochran, W., Deeg, H. J., Díaz, R. F., Dvorak, R., Endl, M., Erikson, A., Ferraz-Mello, S., Fruth, Th., Gazzano, J.-C., Gillon, M., Guenther, E. W., Guillot, T., Hatzes, A., Havel, M., Hébrard, G., Jehin, E., Jorda, L., Léger, A., Llebaria, A., Lammer, H., Lovis, C., MacQueen, P. J., Mazeh, T., Ollivier, M., Pätzold, M., Queloz, D., Rauer, H., Rouan, D., Santerne, A., Schneider, J., Tingley, B., Titz-Weider, R., and Wuchterl, G.

Abstract

We report on the discovery of a hot Jupiter-type exoplanet, CoRoT-17b, detected by the CoRoT satellite. It has a mass of 2.43  ±  0.30 MJupand a radius of 1.02  ±  0.07 RJup, while its mean density is 2.82  ±  0.38 g/cm3. CoRoT-17b is in a circular orbit with a period of 3.7681  ±  0.0003 days. The host star is an old (10.7  ±  1.0 Gyr) main-sequence star, which makes it an intriguing object for planetary evolution studies. The planet’s internal composition is not well constrained and can range from pure H/He to one that can contain  ~380 earth masses of heavier elements.

Published
2011
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40. Transiting exoplanets from the CoRoT space mission⋆

Author

Tingley, B., Endl, M., Gazzano, J.-C., Alonso, R., Mazeh, T., Jorda, L., Aigrain, S., Almenara, J.-M., Auvergne, M., Baglin, A., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Bruntt, H., Cabrera, J., Carpano, S., Carone, L., Cochran, W. D., Csizmadia, Sz., Deleuil, M., Deeg, H. J., Dvorak, R., Erikson, A., Ferraz-Mello, S., Fridlund, M., Gandolfi, D., Gillon, M., Guenther, E. W., Guillot, T., Hatzes, A., Hébrard, G., Léger, A., Llebaria, A., Lammer, H., Lovis, C., MacQueen, P. J., Moutou, C., Ollivier, M., Ofir, A., Pätzold, M., Pepe, F., Queloz, D., Rauer, H., Rouan, D., Samuel, B., Schneider, J., Shporer, A., and Wuchterl, G.

Abstract

In this paper, the CoRoT ExoplanetScience Team announces its 14th discovery. Herein, we discuss the observations and analyses that allowed us to derive the parameters of this system: a hot Jupiter with a mass of 7.6 ± 0.6 Jupiter masses orbiting a solar-type star (F9V) with a period of only 1.5 d, less than 5 stellar radii from its parent star. It is unusual for such a massive planet to have such a small orbit: only one other known higher mass exoplanet orbits with a shorter period.

Published
2011
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41. Transiting exoplanets from the CoRoT space mission⋆

Author

Bouchy, F., Deleuil, M., Guillot, T., Aigrain, S., Carone, L., Cochran, W. D., Almenara, J. M., Alonso, R., Auvergne, M., Baglin, A., Barge, P., Bonomo, A. S., Bordé, P., Csizmadia, Sz., De Bondt, K., Deeg, H. J., Díaz, R. F., Dvorak, R., Endl, M., Erikson, A., Ferraz-Mello, S., Fridlund, M., Gandolfi, D., Gazzano, J. C., Gibson, N., Gillon, M., Guenther, E., Hatzes, A., Havel, M., Hébrard, G., Jorda, L., Léger, A., Lovis, C., Llebaria, A., Lammer, H., MacQueen, P. J., Mazeh, T., Moutou, C., Ofir, A., Ollivier, M., Parviainen, H., Pätzold, M., Queloz, D., Rauer, H., Rouan, D., Santerne, A., Schneider, J., Tingley, B., and Wuchterl, G.

Abstract

We report the discovery by the CoRoTspace mission of a transiting brown dwarf orbiting a F7V star with an orbital period of 3.06 days. CoRoT-15b has a radius of 1.12\hbox{$^{+0.30}_{-0.15}$}RJupand a mass of 63.3 ± 4.1 MJup, and is thus the second transiting companion lying in the theoretical mass domain of brown dwarfs. CoRoT-15b is either very young or inflated compared to standard evolution models, a situation similar to that of M-dwarf stars orbiting close to solar-typestars. Spectroscopic constraints and an analysis of the lightcurve imply a spin period in the range 2.9–3.1 days for the central star, which is compatible with a double-synchronisation of the system.

Published
2011
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42. Photospheric activity, rotation, and star-planet interaction of the planet-hosting star CoRoT-6⋆

Author

Lanza, A. F., Bonomo, A. S., Pagano, I., Leto, G., Messina, S., Cutispoto, G., Moutou, C., Aigrain, S., Alonso, R., Barge, P., Deleuil, M., Fridlund, M., Silva-Valio, A., Auvergne, M., Baglin, A., and Collier Cameron, A.

Abstract

Context.The CoRoT satellite has recently discovered a hot Jupiter that transits across the disc of a F9 main-sequence star called CoRoT-6 with a period of 8.886 days.

Published
2011
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43. Transiting exoplanets from the CoRoT space mission

Author

Gandolfi, D., Hébrard, G., Alonso, R., Deleuil, M., Guenther, E. W., Fridlund, M., Endl, M., Eigmüller, P., Csizmadia, Sz., Havel, M., Aigrain, S., Auvergne, M., Baglin, A., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Bruntt, H., Cabrera, J., Carpano, S., Carone, L., Cochran, W. D., Deeg, H. J., Dvorak, R., Eislöffel, J., Erikson, A., Ferraz-Mello, S., Gazzano, J.-C., Gibson, N. B., Gillon, M., Gondoin, P., Guillot, T., Hartmann, M., Hatzes, A., Jorda, L., Kabath, P., Léger, A., Llebaria, A., Lammer, H., MacQueen, P. J., Mayor, M., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Pepe, F., Queloz, D., Rauer, H., Rouan, D., Samuel, B., Schneider, J., Stecklum, B., Tingley, B., Udry, S., and Wuchterl, G.

Abstract

The CoRoTexoplanet science team announces the discovery of CoRoT-11b, a fairly massive hot-Jupiter transiting a V= 12.9 mag F6 dwarf star (M∗= 1.27 ± 0.05 M⊙, R∗= 1.37 ± 0.03 R⊙, Teff= 6440 ± 120 K), with an orbital period of P= 2.994329 ± 0.000011 days and semi-major axis a= 0.0436 ± 0.005 AU. The detection of part of the radial velocity anomaly caused by the Rossiter-McLaughlin effect shows that the transit-like events detected by CoRoTare caused by a planet-sized transiting object in a prograde orbit. The relatively high projected rotational velocity of the star (vsini⋆= 40 ± 5 km s-1) places CoRoT-11 among the most rapidly rotating planet host stars discovered so far. With a planetary mass of Mp= 2.33 ± 0.34 MJupand radius Rp= 1.43 ± 0.03 RJup, the resulting mean density of CoRoT-11b (ρp= 0.99 ± 0.15 g/cm3) can be explained with a model for an inflated hydrogen-planet with a solar composition and a high level of energy dissipation in its interior.

Published
2010
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44. MML 53: a new low-mass, pre-main sequence eclipsing binary in the Upper Centaurus-Lupus region discovered by SuperWASP

Author

Hebb, L., Stempels, H. C., Aigrain, S., Collier-Cameron, A., Hodgkin, S. T., Irwin, J. M., Maxted, P. F. L., Pollacco, D., Street, R. A., Wilson, D. M., and Stassun, K. G.

Abstract

We announce the discovery of a new low-mass, pre-main sequence eclipsing binary, MML 53. Previous observations of MML 53 found it to be a pre-main sequence spectroscopic multiple associated with the 15–22 Myr Upper Centaurus-Lupus cluster. We identify the object as an eclipsing binary for the first time through the analysis of multiple seasons of time series photometry from the SuperWASP transiting planet survey. Re-analysis of a single archive spectrum shows MML 53 to be a spatially unresolved triple system of young stars which all exhibit significant lithium absorption. Two of the components comprise an eclipsing binary with period, P= 2.097891(6) ± 0.000005 and mass ratio, q~ 0.8. Here, we present the analysis of the discovery data.

Published
2010
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45. Transiting exoplanets from the CoRoT space mission⋆

Author

Cabrera, J., Bruntt, H., Ollivier, M., Díaz, R. F., Csizmadia, Sz., Aigrain, S., Alonso, R., Almenara, J.-M., Auvergne, M., Baglin, A., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Carone, L., Carpano, S., Deleuil, M., Deeg, H. J., Dvorak, R., Erikson, A., Ferraz-Mello, S., Fridlund, M., Gandolfi, D., Gazzano, J.-C., Gillon, M., Guenther, E. W., Guillot, T., Hatzes, A., Havel, M., Hébrard, G., Jorda, L., Léger, A., Llebaria, A., Lammer, H., Lovis, C., Mazeh, T., Moutou, C., Ofir, A., von Paris, P., Pätzold, M., Queloz, D., Rauer, H., Rouan, D., Santerne, A., Schneider, J., Tingley, B., Titz-Weider, R., and Wuchterl, G.

Abstract

We announce the discovery of the transiting planet CoRoT-13b. Ground-based follow-up in CFHT and IAC80 confirmed CoRoT’s observations. The mass of the planet was measured with the HARPS spectrograph and the properties of the host star were obtained analyzing HIRES spectra from the Keck telescope. It is a hot Jupiter-like planet with an orbital period of 4.04 days, 1.3 Jupiter masses, 0.9 Jupiter radii, and a density of 2.34 g cm-3. It orbits a G0V star with Teff= 5945 K, M∗= 1.09 M⊙, R∗= 1.01 R⊙, solar metallicity, a lithium content of  + 1.45 dex, and an estimated age of between 0.12 and 3.15 Gyr. The lithium abundance of the star is consistent with its effective temperature, activity level, and age range derived from the stellar analysis. The density of the planet is extreme for its mass, implies that heavy elements are present with a mass of between about 140 and 300 M⊕.

Published
2010
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46. Accretion dynamics and disk evolution in NGC 2264: a study based on CoRoT*photometric observations**

Author

Alencar, S. H. P., Teixeira, P. S., Guimarães, M. M., McGinnis, P. T., Gameiro, J. F., Bouvier, J., Aigrain, S., Flaccomio, E., and Favata, F.

Abstract

Context. The young cluster NGC 2264 was observed with the CoRoT satellite for 23 days uninterruptedly in March 2008 with unprecedented photometric accuracy. We present the first results of our analysis of the accreting population belonging to the cluster as observed by CoRoT. Aims. We search for possible light curve variability of the same nature as that observed in the classical T Tauri star AA Tau, which was attributed to a magnetically controlled inner disk warp. The inner warp dynamics is supposed to be directly associated with the interaction between the stellar magnetic field and the inner disk region. Methods. We analyzed the CoRoT light curves of 83 previously known classical T Tauri stars that belong to NGC 2264 classifying them according to their light-curve morphology. We also studied the CoRoT light-curve morphology as a function of a Spitzer-based classification of the star-disk systems. Results. The classification derived on the basis of the CoRoT light-curve morphology agrees very well with the SpitzerIRAC-based classification of the systems. The percentage of AA Tau-like light curves decreases as the inner disk dissipates, from 40% ±10% in systems with thick inner disks to 36% ±16% in systems with anemic disks and zero in naked photosphere systems. Indeed, 91% ±29% of the CTTS with naked photospheres exhibit pure spot-like variability, while only 18% ±7% of the thick disk systems do so, presumably those seen at low inclination and thus free of variable obscuration. Conclusions. AA Tau-like light curves are found to be fairly common, with a frequency of at least ~30 to 40% in young stars with inner dusty disks. The temporal evolution of the light curves indicates that the structure of the inner disk warp, located close to the corotation radius and responsible for the obscuration episodes, varies over a timescale of a few (~1–3) rotational periods. This probably reflects the highly dynamical nature of the star-disk magnetospheric interaction.

Published
2010

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