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Your search keyword '"Rameau, J."' showing total 20 results
Start Over Author "Rameau, J." Publisher edp sciences
20 results on '"Rameau, J."'

1. Direct discovery of the inner exoplanet in the HD 206893 system

Author

Hinkley, S., primary, Lacour, S., additional, Marleau, G.-D., additional, Lagrange, A.-M., additional, Wang, J. J., additional, Kammerer, J., additional, Cumming, A., additional, Nowak, M., additional, Rodet, L., additional, Stolker, T., additional, Balmer, W.-O., additional, Ray, S., additional, Bonnefoy, M., additional, Mollière, P., additional, Lazzoni, C., additional, Kennedy, G., additional, Mordasini, C., additional, Abuter, R., additional, Aigrain, S., additional, Amorim, A., additional, Asensio-Torres, R., additional, Babusiaux, C., additional, Benisty, M., additional, Berger, J.-P., additional, Beust, H., additional, Blunt, S., additional, Boccaletti, A., additional, Bohn, A., additional, Bonnet, H., additional, Bourdarot, G., additional, Brandner, W., additional, Cantalloube, F., additional, Caselli, P., additional, Charnay, B., additional, Chauvin, G., additional, Chomez, A., additional, Choquet, E., additional, Christiaens, V., additional, Clénet, Y., additional, Coudé du Foresto, V., additional, Cridland, A., additional, Delorme, P., additional, Dembet, R., additional, Drescher, A., additional, Duvert, G., additional, Eckart, A., additional, Eisenhauer, F., additional, Feuchtgruber, H., additional, Galland, F., additional, Garcia, P., additional, Garcia Lopez, R., additional, Gardner, T., additional, Gendron, E., additional, Genzel, R., additional, Gillessen, S., additional, Girard, J. H., additional, Grandjean, A., additional, Haubois, X., additional, Heißel, G., additional, Henning, Th., additional, Hippler, S., additional, Horrobin, M., additional, Houllé, M., additional, Hubert, Z., additional, Jocou, L., additional, Keppler, M., additional, Kervella, P., additional, Kreidberg, L., additional, Lapeyrère, V., additional, Le Bouquin, J.-B., additional, Léna, P., additional, Lutz, D., additional, Maire, A.-L., additional, Mang, F., additional, Mérand, A., additional, Meunier, N., additional, Monnier, J. D., additional, Mouillet, D., additional, Nasedkin, E., additional, Ott, T., additional, Otten, G. P. P. L., additional, Paladini, C., additional, Paumard, T., additional, Perraut, K., additional, Perrin, G., additional, Philipot, F., additional, Pfuhl, O., additional, Pourré, N., additional, Pueyo, L., additional, Rameau, J., additional, Rickman, E., additional, Rubini, P., additional, Rustamkulov, Z., additional, Samland, M., additional, Shangguan, J., additional, Shimizu, T., additional, Sing, D., additional, Straubmeier, C., additional, Sturm, E., additional, Tacconi, L. J., additional, van Dishoeck, E. F., additional, Vigan, A., additional, Vincent, F., additional, Ward-Duong, K., additional, Widmann, F., additional, Wieprecht, E., additional, Wiezorrek, E., additional, Woillez, J., additional, Yazici, S., additional, Young, A., additional, and Zicher, N., additional

Published
2023
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2. GRAVITY K-band spectroscopy of HD 206893 B

Author

Kammerer, J., primary, Lacour, S., additional, Stolker, T., additional, Mollière, P., additional, Sing, D. K., additional, Nasedkin, E., additional, Kervella, P., additional, Wang, J. J., additional, Ward-Duong, K., additional, Nowak, M., additional, Abuter, R., additional, Amorim, A., additional, Asensio-Torres, R., additional, Bauböck, M., additional, Benisty, M., additional, Berger, J.-P., additional, Beust, H., additional, Blunt, S., additional, Boccaletti, A., additional, Bohn, A., additional, Bolzer, M.-L., additional, Bonnefoy, M., additional, Bonnet, H., additional, Brandner, W., additional, Cantalloube, F., additional, Caselli, P., additional, Charnay, B., additional, Chauvin, G., additional, Choquet, E., additional, Christiaens, V., additional, Clénet, Y., additional, Coudé du Foresto, V., additional, Cridland, A., additional, Dembet, R., additional, Dexter, J., additional, de Zeeuw, P. T., additional, Drescher, A., additional, Duvert, G., additional, Eckart, A., additional, Eisenhauer, F., additional, Gao, F., additional, Garcia, P., additional, Garcia Lopez, R., additional, Gendron, E., additional, Genzel, R., additional, Gillessen, S., additional, Girard, J., additional, Haubois, X., additional, Heißel, G., additional, Henning, T., additional, Hinkley, S., additional, Hippler, S., additional, Horrobin, M., additional, Houllé, M., additional, Hubert, Z., additional, Jocou, L., additional, Keppler, M., additional, Kreidberg, L., additional, Lagrange, A.-M., additional, Lapeyrère, V., additional, Le Bouquin, J.-B., additional, Léna, P., additional, Lutz, D., additional, Maire, A.-L., additional, Mérand, A., additional, Monnier, J. D., additional, Mouillet, D., additional, Müller, A., additional, Ott, T., additional, Otten, G. P. P. L., additional, Paladini, C., additional, Paumard, T., additional, Perraut, K., additional, Perrin, G., additional, Pfuhl, O., additional, Pueyo, L., additional, Rameau, J., additional, Rodet, L., additional, Rousset, G., additional, Rustamkulov, Z., additional, Shangguan, J., additional, Shimizu, T., additional, Stadler, J., additional, Straub, O., additional, Straubmeier, C., additional, Sturm, E., additional, Tacconi, L. J., additional, van Dishoeck, E. F., additional, Vigan, A., additional, Vincent, F., additional, von Fellenberg, S. D., additional, Widmann, F., additional, Wieprecht, E., additional, Wiezorrek, E., additional, Woillez, J., additional, and Yazici, S., additional

Published
2021
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4. Medium-resolution spectrum of the exoplanet HIP 65426 b

Author

Petrus, S., primary, Bonnefoy, M., additional, Chauvin, G., additional, Charnay, B., additional, Marleau, G.-D., additional, Gratton, R., additional, Lagrange, A.-M., additional, Rameau, J., additional, Mordasini, C., additional, Nowak, M., additional, Delorme, P., additional, Boccaletti, A., additional, Carlotti, A., additional, Houllé, M., additional, Vigan, A., additional, Allard, F., additional, Desidera, S., additional, D’Orazi, V., additional, Hoeijmakers, H. J., additional, Wyttenbach, A., additional, and Lavie, B., additional

Published
2021
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9. Magnetic activity in the HARPS M dwarf sample: The rotation-activity relationship for very low-mass stars through R'HK.

Author

Astudillo-Defru, N., Delfosse, X., Bonfils, X., Forveille, T., Lovis, C., and Rameau, J.

Subjects
STELLAR magnetic fields, DWARF stars, STELLAR rotation, STELLAR activity
Abstract

Context. Atmospheric magnetic fields in stars with convective envelopes heat stellar chromospheres, and thus increase the observed flux in the Ca ii H and K doublet. Starting with the historical Mount Wilson monitoring program, these two spectral lines have been widely used to trace stellar magnetic activity, and as a proxy for rotation period (Prot) and consequently for stellar age. Monitoring stellar activity has also become essential in filtering out false-positives due to magnetic activity in extra-solar planet surveys. The Ca ii emission is traditionally quantified through the R'HK-index, which compares the chromospheric flux in the doublet to the overall bolometric flux of the star. Much work has been done to characterize this index for FGK-dwarfs, but M dwarfs - the most numerous stars of the Galaxy - were left out of these analyses and no calibration of their Ca ii H and K emission to an R'HK exists to date. Aims. We set out to characterize the magnetic activity of the low- and very-low-mass stars by providing a calibration of the R'HK-index that extends to the realm of M dwarfs, and by evaluating the relationship between R'HK and the rotation period. Methods. We calibrated the bolometric and photospheric factors for M dwarfs to properly transform the S -index (which compares the flux in the Ca ii H and K lines to a close spectral continuum) into the R'HK. We monitored magnetic activity through the Ca ii H and K emission lines in the HARPS M dwarf sample. Results. The R'HK index, like the fractional X-ray luminosity LX/Lbol, shows a saturated correlation with rotation, with saturation setting in around a ten days rotation period. Above that period, slower rotators show weaker Ca ii activity, as expected. Under that period, the R'HK index saturates to approximately 10-4. Stellar mass modulates the Ca ii activity, with R'HK showing a constant basal activity above 0.6 M๏ and then decreasing with mass between 0.6 M๏ and the fully-convective limit of 0.35 M๏. Short-term variability of the activity correlates with its mean level and stars with higher R'HK indexes show larger R'HK variability, as previously observed for earlier spectral types. [ABSTRACT FROM AUTHOR]

Published
2017
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10. Physical and orbital properties ofβPictoris b

Author

Bonnefoy, M., primary, Marleau, G.-D., additional, Galicher, R., additional, Beust, H., additional, Lagrange, A.-M., additional, Baudino, J.-L., additional, Chauvin, G., additional, Borgniet, S., additional, Meunier, N., additional, Rameau, J., additional, Boccaletti, A., additional, Cumming, A., additional, Helling, C., additional, Homeier, D., additional, Allard, F., additional, and Delorme, P., additional

Published
2014
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11. Search for cool giant exoplanets around young and nearby stars

Author

Maire, A.-L., primary, Boccaletti, A., additional, Rameau, J., additional, Chauvin, G., additional, Lagrange, A.-M., additional, Bonnefoy, M., additional, Desidera, S., additional, Sylvestre, M., additional, Baudoz, P., additional, Galicher, R., additional, and Mouillet, D., additional

Published
2014
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18. Near-infrared detection and characterization of the exoplanet HD95086 b with the Gemini Planet Imager.

Author

Galicher, R., Rameau, J., Bonnefoy, M., Baudino, J.-L., Currie, T., Boccaletti, A., Chauvin, G., Lagrange, A.-M., and Marois, C.

Subjects
*DETECTION of extrasolar planets, *IMAGING systems in astronomy, *NEAR infrared radiation, *STAR observations, *ASTRONOMICAL photometry
Abstract

HD 95086 is an intermediate-mass debris-disk-bearing star. VLT/NaCo 3.8μm observations revealed it hosts a 5±2MJup companion (HD 95086 b) at ≃56 AU. Follow-up observations at 1.66 and 2.18 μm yielded a null detection, suggesting extremely red colors for the planet and the need for deeper direct-imaging data. In this Letter, we report H- (1.7μm) and K1- (2.05μm) band detections of HD 95086 b from Gemini Planet Imager (GPI) commissioning observations taken by the GPI team. The planet position in both spectral channels is consistent with the NaCo measurements and we confirm it to be comoving. Our photometry yields colors of H-L'= 3.6±1.0 mag and K1-L'=2.4±0.7 mag, consistent with previously reported 5-s upper limits in H and Ks. The photometry of HD 95086 b best matches that of 2M 1207 b and HR 8799 cde. Comparing its spectral energy distribution with the BT-SETTL and LESIA planet atmospheric models yields Teff~600-1500 K and log g~2.1-4.5. Hot-start evolutionary models yield M=5±2 MJup. Warm-start models reproduce the combined absolute fluxes of the object for M=4-14 MJup for a wide range of plausible initial conditions (Sinit=8-13 kB/baryon). The color-magnitude diagram location of HD 95086 b and its estimated Teff and log g suggest that the planet is a peculiar L-T transition object with an enhanced amount of photospheric dust. [ABSTRACT FROM AUTHOR]

Published
2014
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20. Magnetic activity in the HARPS M dwarf sample: The rotation-activity relationship for very low-mass stars through R'HK.

Author

Astudillo-Defru, N., Delfosse, X., Bonfils, X., Forveille, T., Lovis, C., and Rameau, J.

Subjects
*STELLAR magnetic fields, *DWARF stars, *STELLAR rotation, *STELLAR activity
Abstract

Context. Atmospheric magnetic fields in stars with convective envelopes heat stellar chromospheres, and thus increase the observed flux in the Ca ii H and K doublet. Starting with the historical Mount Wilson monitoring program, these two spectral lines have been widely used to trace stellar magnetic activity, and as a proxy for rotation period (Prot) and consequently for stellar age. Monitoring stellar activity has also become essential in filtering out false-positives due to magnetic activity in extra-solar planet surveys. The Ca ii emission is traditionally quantified through the R'HK-index, which compares the chromospheric flux in the doublet to the overall bolometric flux of the star. Much work has been done to characterize this index for FGK-dwarfs, but M dwarfs - the most numerous stars of the Galaxy - were left out of these analyses and no calibration of their Ca ii H and K emission to an R'HK exists to date. Aims. We set out to characterize the magnetic activity of the low- and very-low-mass stars by providing a calibration of the R'HK-index that extends to the realm of M dwarfs, and by evaluating the relationship between R'HK and the rotation period. Methods. We calibrated the bolometric and photospheric factors for M dwarfs to properly transform the S -index (which compares the flux in the Ca ii H and K lines to a close spectral continuum) into the R'HK. We monitored magnetic activity through the Ca ii H and K emission lines in the HARPS M dwarf sample. Results. The R'HK index, like the fractional X-ray luminosity LX/Lbol, shows a saturated correlation with rotation, with saturation setting in around a ten days rotation period. Above that period, slower rotators show weaker Ca ii activity, as expected. Under that period, the R'HK index saturates to approximately 10-4. Stellar mass modulates the Ca ii activity, with R'HK showing a constant basal activity above 0.6 M๏ and then decreasing with mass between 0.6 M๏ and the fully-convective limit of 0.35 M๏. Short-term variability of the activity correlates with its mean level and stars with higher R'HK indexes show larger R'HK variability, as previously observed for earlier spectral types. [ABSTRACT FROM AUTHOR]

Published
2017
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