Search

Your search keyword '"Kagetani, Taiki"' showing total 22 results
Start Over Author "Kagetani, Taiki"
22 results on '"Kagetani, Taiki"'

1. Detection of an Earth-sized exoplanet orbiting the nearby ultracool dwarf star SPECULOOS-3

Author

Gillon, Michaël, Pedersen, Peter P., Rackham, Benjamin V., Dransfield, Georgina, Ducrot, Elsa, Barkaoui, Khalid, Burdanov, Artem Y., Schroffenegger, Urs, Chew, Yilen Gómez Maqueo, Lederer, Susan M., Alonso, Roi, Burgasser, Adam J., Howell, Steve B., Narita, Norio, de Wit, Julien, Demory, Brice-Olivier, Queloz, Didier, Triaud, Amaury H. M. J., Delrez, Laetitia, Jehin, Emmanuël, Hooton, Matthew J., Garcia, Lionel J., Muñoz, Clàudia Jano, Murray, Catriona A., Pozuelos, Francisco J., Sebastian, Daniel, Timmermans, Mathilde, Thompson, Samantha J., Aceituno, Jesús, Aganze, Christian, Amado, Pedro J., Baycroft, Thomas, Benkhaldoun, Zouhair, Berardo, David, Bolmont, Emeline, Clark, Catherine A., Davis, Yasmin T., Davoudi, Fatemeh, de Beurs, Zoë L., de Leon, Jerome P., Ikoma, Masahiro, Ikuta, Kai, Isogai, Keisuke, Fukuda, Izuru, Fukui, Akihiko, Gerasimov, Roman, Ghachoui, Mourad, Günther, Maximilian N., Hasler, Samantha, Hayashi, Yuya, Heng, Kevin, Hu, Renyu, Kagetani, Taiki, Kawai, Yugo, Kawauchi, Kiyoe, Kitzmann, Daniel, Koll, Daniel D. B., Lendl, Monika, Livingston, John H., Lyu, Xintong, Valdés, Erik A. Meier, Mori, Mayuko, McCormac, James J., Murgas, Felipe, Niraula, Prajwal, Pallé, Enric, Plauchu-Frayn, Ilse, Rebolo, Rafael, Sabin, Laurence, Schackey, Yannick, Schanche, Nicole, Selsis, Franck, Sota, Alfredo, Stalport, Manu, Standing, Matthew R., Stassun, Keivan G., Tamura, Motohide, Theissen, Christopher A., Turbet, Martin, Van Grootel, Valérie, Varas, Roberto, Watanabe, Noriharu, and Lang, Francis Zong

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Located at the bottom of the main sequence, ultracool dwarf stars are widespread in the solar neighbourhood. Nevertheless, their extremely low luminosity has left their planetary population largely unexplored, and only one of them, TRAPPIST-1, has so far been found to host a transiting planetary system. In this context, we present the SPECULOOS project's detection of an Earth-sized planet in a 17 h orbit around an ultracool dwarf of M6.5 spectral type located 16.8 pc away. The planet's high irradiation (16 times that of Earth) combined with the infrared luminosity and Jupiter-like size of its host star make it one of the most promising rocky exoplanet targets for detailed emission spectroscopy characterization with JWST. Indeed, our sensitivity study shows that just ten secondary eclipse observations with the Mid-InfraRed Instrument/Low-Resolution Spectrometer on board JWST should provide strong constraints on its atmospheric composition and/or surface mineralogy.

Published
2024
Full Text
View/download PDF

2. Simultaneous multicolour transit photometry of hot Jupiters HAT-P-19b, HAT-P-51b, HAT-P-55b, and HAT-P-65b

Author

Kang, Huiyi, Chen, Guo, Palle, Enric, Murgas, Felipe, Garcia, Nestor Abreu, de Leon, Jerome, Enoc, Gareb, Esparza-Borges, Emma, Fukuda, Izuru, Fukui, Akihiko, Galan, Daniel, Hayashi, Yuya, Isogai, Keisuke, Kagetani, Taiki, Kawauchi, Kiyoe, Korth, Judith, Livingston, John, Luque, Rafael, Ma, Yuehua, Aguado, Alberto Madrigal, Meni, Pedro, Montañés-Rodríguez, Pilar, Mayuko, Mori, Torres, Sara Muñoz, Narita, Norio, Miquel, Jaume Orell, Parviainen, Hannu, Pelaez-Torres, Alberto, Stangret, Monika, Tamura, Motohide, and Watanabe, Noriharu

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Accurate physical parameters of exoplanet systems are essential for further exploration of planetary internal structure, atmospheres, and formation history. We aim to use simultaneous multicolour transit photometry to improve the estimation of transit parameters, to search for transit timing variations (TTVs), and to establish which of our targets should be prioritised for follow-up transmission spectroscopy. We performed time series photometric observations of 12 transits for the hot Jupiters HAT-P-19b, HAT-P-51b, HAT-P-55b, and HAT-P-65b using the simultaneous four-colour camera MuSCAT2 on the Telescopio Carlos S\'anchez. We collected 56 additional transit light curves from TESS photometry. To derive transit parameters, we modelled the MuSCAT2 light curves with Gaussian processes to account for correlated noise. To derive physical parameters, we performed EXOFASTv2 global fits to the available transit and radial velocity data sets, together with the Gaia DR3 parallax, isochrones, and spectral energy distributions. To assess the potential for atmospheric characterisation, we compared the multicolour transit depths with a flat line and a clear atmosphere model. We consistently refined the transit and physical parameters. We improved the orbital period and ephemeris estimates, and found no evidence for TTVs or orbital decay. The MuSCAT2 broadband transmission spectra of HAT-P-19b and HAT-P-65b are consistent with previously published low-resolution transmission spectra. We also found that, except for HAT-P-65b, the assumption of a planetary atmosphere can improve the fit to the MuSCAT2 data. In particular, we identified HAT-P-55b as a priority target among these four planets for further atmospheric studies using transmission spectroscopy., Comment: Corrected a typo in T0 of HAT-P-65b (the correct value is 2458139.35067)

Published
2024
Full Text
View/download PDF

3. An M dwarf accompanied by a close-in giant orbiter with SPECULOOS

Author

Triaud, Amaury H. M. J., Dransfield, Georgina, Kagetani, Taiki, Timmermans, Mathilde, Narita, Norio, Barkaoui, Khalid, Hirano, Teruyuki, Rackham, Benjamin V., Mori, Mayuko, Baycroft, Thomas, Benkhaldoun, Zouhair, Burgasser, Adam J., Caldwell, Douglas A., Collins, Karen A., Davis, Yasmin T., Delrez, Laetitia, Demory, Brice-Oliver, Ducrot, Elsa, Fukui, Akihiko, Muñoz, Clàudia Jano, Jehin, Emmanuël, García, Lionel J., Ghachoui, Mourad, Gillon, Michaël, Chew, Yilen Gómez Maqueo, Hooton, Matthew J., Ikoma, Masahiro, Kawauchi, Kiyoe, Kotani, Takayuki, Levine, Alan M., Pallé, Enric, Pedersen, Peter P., Pozuelos, Francisco J., Queloz, Didier, Scutt, Owen J., Seager, Sara, Sebastian, Daniel, Tamura, Motohide, Thompson, Samantha, Watanabe, Noriharu, de Wit, Julien, Winn, Joshua N., and Zúñiga-Fernández, Sebastián

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract

In the last decade, a dozen close-in giant planets have been discovered orbiting stars with spectral types ranging from M0 to M4, a mystery since known formation pathways do not predict the existence of such systems. Here, we confirm TOI-4860 b, a Jupiter-sized planet orbiting an M4.5 host, a star at the transition between fully and partially convective interiors. First identified with TESS data, we validate the transiting companion's planetary nature through multicolour photometry from the TRAPPIST-South/North, SPECULOOS, and MuSCAT3 facilities. Our analysis yields a radius of $0.76 \pm 0.02~ \rm R_{Jup}$ for the planet, a mass of $0.34~\rm M_\odot$ for the star, and an orbital period of 1.52 d. Using the newly commissioned SPIRIT InGaAs camera at the SPECULOOS-South Observatory, we collect infrared photometry in zYJ that spans the time of secondary eclipse. These observations do not detect a secondary eclipse, placing an upper limit on the brightness of the companion. The planetary nature of the companion is further confirmed through high-resolution spectroscopy obtained with the IRD spectrograph at Subaru Telescope, from which we measure a mass of $0.67 \pm 0.14~\rm M_{Jup}$ . Based on its overall density, TOI-4860 b appears to be rich in heavy elements, like its host star., Comment: Accepted for publication in MNRAS Letters

Published
2023
Full Text
View/download PDF

4. The mass determination of TOI-519 b: a close-in giant planet transiting a metal-rich mid-M dwarf

Author

Kagetani, Taiki, Narita, Norio, Kimura, Tadahiro, Hirano, Teruyuki, Ikoma, Masahiro, Ishikawa, Hiroyuki Tako, Giacalone, Steven, Fukui, Akihiko, Kodama, Takanori, Gore, Rebecca, Schroeder, Ashley, Hori, Yasunori, Kawauchi, Kiyoe, Watanabe, Noriharu, Mori, Mayuko, Zou, Yujie, Ikuta, Kai, Krishnamurthy, Vigneshwaran, Zink, Jon, Hardegree-Ullman, Kevin, Harakawa, Hiroki, Kudo, Tomoyuki, Kotani, Takayuki, Kurokawa, Takashi, Kusakabe, Nobuhiko, Kuzuhara, Masayuki, de Leon, Jerome P., Livingston, John H., Nishikawa, Jun, Omiya, Masashi, Palle, Enric, Parviainen, Hannu, Serizawa, Takuma, Teng, Huan-Yu, Ueda, Akitoshi, and Tamura, Motohide

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

We report the mass determination of TOI-519 b, a transiting substellar object around a mid-M dwarf. We carried out radial velocity measurements using Subaru / InfraRed Doppler (IRD), revealing that TOI-519 b is a planet with a mass of $0.463^{+0.082}_{-0.088}~M_{\rm Jup}$. We also find that the host star is metal rich ($\rm [Fe/H] = 0.27 \pm 0.09$ dex) and has the lowest effective temperature ($T_{\rm eff}=3322 \pm 49$ K) among all stars hosting known close-in giant planets based on the IRD spectra and mid-resolution infrared spectra obtained with NASA Infrared Telescope Facility / SpeX. The core mass of TOI-519 b inferred from a thermal evolution model ranges from $0$ to $\sim30~M_\oplus$, which can be explained by both the core accretion and disk instability models as the formation origins of this planet. However, TOI-519 is in line with the emerging trend that M dwarfs with close-in giant planets tend to have high metallicity, which may indicate that they formed in the core accretion model. The system is also consistent with the potential trend that close-in giant planets around M dwarfs tend to be less massive than those around FGK dwarfs., Comment: 10 pages, 5 figures. Accepted for publication in PASJ

Published
2023
Full Text
View/download PDF

5. TOI-1452 b: SPIRou and TESS reveal a super-Earth in a temperate orbit transiting an M4 dwarf

Author

Cadieux, Charles, Doyon, René, Plotnykov, Mykhaylo, Hébrard, Guillaume, Jahandar, Farbod, Artigau, Étienne, Valencia, Diana, Cook, Neil J., Martioli, Eder, Vandal, Thomas, Donati, Jean-François, Cloutier, Ryan, Narita, Norio, Fukui, Akihiko, Hirano, Teruyuki, Bouchy, François, Cowan, Nicolas B., Gonzales, Erica J., Ciardi, David R., Stassun, Keivan G., Arnold, Luc, Benneke, Björn, Boisse, Isabelle, Bonfils, Xavier, Carmona, Andrés, Cortés-Zuleta, Pía, Delfosse, Xavier, Forveille, Thierry, Fouqué, Pascal, da Silva, João Gomes, Jenkins, Jon M., Kiefer, Flavien, Kóspál, Ágnes, Lafrenière, David, Martins, Jorge H. C., Moutou, Claire, Nascimento Jr., J. -D. do, Ould-Elhkim, Merwan, Pelletier, Stefan, Twicken, Joseph D., Bouma, Luke G., Cartwright, Scott, Darveau-Bernier, Antoine, Grankin, Konstantin, Ikoma, Masahiro, Kagetani, Taiki, Kawauchi, Kiyoe, Kodama, Takanori, Kotani, Takayuki, Latham, David W., Menou, Kristen, Ricker, George, Seager, Sara, Tamura, Motohide, Vanderspek, Roland, and Watanabe, Noriharu

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract

Exploring the properties of exoplanets near or inside the radius valley provides insights on the transition from the rocky super-Earths to the larger, hydrogen-rich atmosphere mini-Neptunes. Here, we report the discovery of TOI-1452 b, a transiting super-Earth ($R_{\rm p} = 1.67 \pm 0.07$ R$_{\oplus}$) in an 11.1--day temperate orbit ($T_{\rm eq} = 326 \pm 7$ K) around the primary member ($H = 10.0$, $T_{\rm eff} = 3185 \pm 50$ K) of a nearby visual binary M dwarf. The transits were first detected by TESS, then successfully isolated between the two $3.2^{\prime\prime}$ companions with ground-based photometry from OMM and MuSCAT3. The planetary nature of TOI-1452 b was established through high-precision velocimetry with the near-infrared SPIRou spectropolarimeter as part of the ongoing SPIRou Legacy Survey. The measured planetary mass ($4.8 \pm 1.3$ M$_{\oplus}$) and inferred bulk density ($5.6^{+1.8}_{-1.6}$ g/cm$^3$) is suggestive of a rocky core surrounded by a volatile-rich envelope. More quantitatively, the mass and radius of TOI-1452 b, combined with the stellar abundance of refractory elements (Fe, Mg and Si) measured by SPIRou, is consistent with a core mass fraction of $18\pm6$ % and a water mass fraction of $22^{+21}_{-13}$%. The water world candidate TOI-1452 b is a prime target for future atmospheric characterization with JWST, featuring a Transmission Spectroscopy Metric similar to other well-known temperate small planets such as LHS 1140 b and K2-18 b. The system is located near Webb's northern Continuous Viewing Zone, implying that is can be followed at almost any moment of the year., Comment: Published in The Astronomical Journal

Published
2022
Full Text
View/download PDF

6. TOI-1696: a nearby M4 dwarf with a $3R_\oplus$ planet in the Neptunian desert

Author

Mori, Mayuko, Livingston, John H., de Leon, Jerome, Narita, Norio, Hirano, Teruyuki, Fukui, Akihiko, Collins, Karen A., Fujita, Naho, Hori, Yasunori, Ishikawa, Hiroyuki Tako, Kawauchi, Kiyoe, Stassun, Keivan G., Watanabe, Noriharu, Giacalone, Steven, Gore, Rebecca, Schroeder, Ashley, Dressing, Courtney D., Bieryla, Allyson, Jensen, Eric L. N., Massey, Bob, Shporer, Avi, Kuzuhara, Masayuki, Charbonneau, David, Ciardi, David R., Doty, John P., Esparza-Borges, Emma, Harakawa, Hiroki, Hodapp, Klaus, Ikoma, Masahiro, Ikuta, Kai, Isogai, Keisuke, Jenkins, Jon M., Kagetani, Taiki, Kimura, Tadahiro, Kodama, Takanori, Kotani, Takayuki, Krishnamurthy, Vigneshwaran, Kudo, Tomoyuki, Kurita, Seiya, Kurokawa, Takashi, Kusakabe, Nobuhiko, Latham, David W., McLean, Brian, Murgas, Felipe, Nishikawa, Jun, Nishiumi, Taku, Omiya, Masashi, Osborn, Hugh P., Palle, Enric, Parviainen, Hannu, Ricker, George R., Seager, Sara, Serizawa, Takuma, Tamura, Motohide, Teng, Huan-Yu, Terada, Yuka, Twicken, Joseph D., Ueda, Akitoshi, Vanderspek, Roland, Vievard, Sébastien, Winn, Joshua N., and Zou, Yujie

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

We present the discovery and validation of a temperate sub-Neptune around the nearby mid-M dwarf TIC 470381900 (TOI-1696), with a radius of $3.09 \pm 0.11 \,R_\oplus$ and an orbital period of $2.5 \,\rm{days}$, using a combination of TESS and follow-up observations using ground-based telescopes. Joint analysis of multi-band photometry from TESS, MuSCAT, MuSCAT3, Sinistro, and KeplerCam confirmed the transit signal to be achromatic as well as refined the orbital ephemeris. High-resolution imaging with Gemini/'Alopeke and high-resolution spectroscopy with the Subaru/IRD confirmed that there are no stellar companions or background sources to the star. The spectroscopic observations with IRD and IRTF/SpeX were used to determine the stellar parameters, and found the host star is an M4 dwarf with an effective temperature of $T_{eff} = 3185 \pm 76\,\rm{K}$ and a metallicity of [Fe/H] $=0.336 \pm 0.060 \,\rm{dex}$. The radial velocities measured from IRD set a $2$-$\sigma$ upper limit on the planetary mass to be $48.8 \,M_\oplus$. The large radius ratio ($R_p/R_\star \sim 0.1$) and the relatively bright NIR magnitude ($J=12.2 \,\rm{mag}$) make this planet an attractive target for further followup observations. TOI-1696b is one of the planets belonging to the Neptunian desert with the highest transmission spectroscopy metric discovered to date, making it an interesting candidate for atmospheric characterizations with JWST., Comment: 25 pages, 18 figures, 3 tables, Submitted to AJ

Published
2022
Full Text
View/download PDF

7. TOI-2119: A transiting brown dwarf orbiting an active M-dwarf from NASA's TESS mission

Author

Carmichael, Theron W., Irwin, Jonathan M., Murgas, Felipe, Pallé, Enric, Stassun, Keivan G., Bartnik, Matthew, Collins, Karen A., de Leon, Jerome, Esparza-Borges, Emma, Fedewa, Jeremy, Fong, William, Fukui, Akihiko, Jenkins, Jon M., Kagetani, Taiki, Latham, David W., Lund, Michael B., Mann, Andrew W., Moldovan, Dan, Morgan, Edward H., Narita, Norio, Painter, Shane, Parviainen, Hannu, Quintana, Elisa V., Ricker, George R., Schulte, Jack, Schwarz, Richard P., Seager, Sara, Sokolovsky, Kirill, Twicken, Joseph D., and Winn, Joshua N.

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract

We report the discovery of TOI-2119b, a transiting brown dwarf (BD) that orbits and is completely eclipsed by an active M-dwarf star. Using light curve data from the Transiting Exoplanet Survey Satellite mission and follow-up high-resolution Doppler spectroscopic observations, we find the BD has a radius of $R_b = 1.08 \pm 0.03{\rm R_J}$, a mass of $M_b = 64.4 \pm 2.3{\rm M_J}$, an orbital period of $P = 7.200865 \pm 0.00002$ days, and an eccentricity of $e=0.337\pm 0.002$. The host star has a mass of $M_\star = 0.53 \pm 0.02{\rm M_\odot}$, a radius of $R_\star= 0.50 \pm 0.01{\rm R_\odot}$, an effective temperature of $T_{\rm eff} = 3621 \pm 48$K, and a metallicity of $\rm [Fe/H]=+0.06\pm 0.08$. TOI-2119b joins an emerging population of transiting BDs around M-dwarf host stars, with TOI-2119 being the ninth such system. These M-dwarf--brown dwarf systems typically occupy mass ratios near $q = M_b/M_\star \approx 0.1-0.2$, which separates them from the typical mass ratios for systems with transiting substellar objects and giant exoplanets that orbit more massive stars. The nature of the secondary eclipse of the BD by the star enables us to estimate the effective temperature of the substellar object to be $2030\pm 84$K, which is consistent with predictions by substellar evolutionary models., Comment: 14 pages, 13 figures, 4 tables, accepted in MNRAS

Published
2022
Full Text
View/download PDF

8. Validation of 13 Hot and Potentially Terrestrial TESS Planets

Author

Giacalone, Steven, Dressing, Courtney D., Hedges, Christina, Kostov, Veselin B., Collins, Karen A., Jensen, Eric L. N., Yahalomi, Daniel A., Bieryla, Allyson, Ciardi, David R., Howell, Steve B., Lillo-Box, Jorge, Barkaoui, Khalid, Winters, Jennifer G., Matthews, Elisabeth, Livingston, John H., Quinn, Samuel N., Safonov, Boris S., Cadieux, Charles, Furlan, E., Crossfield, Ian J. M., Mandell, Avi M., Gilbert, Emily A., Kruse, Ethan, Quintana, Elisa V., Ricker, George R., Seager, S., Winn, Joshua N., Jenkins, Jon M., Adkins, Britt Duffy, Baker, David, Barclay, Thomas, Barrado, David, Batalha, Natalie M., Belinski, Alexander A., Benkhaldoun, Zouhair, Buchhave, Lars A., Cacciapuoti, Luca, Charbonneau, David, Chontos, Ashley, Christiansen, Jessie L., Cloutier, Ryan, Collins, Kevin I., Conti, Dennis M., Cutting, Neil, Dixon, Scott, Doyon, René, Mufti, Mohammed El, Esparza-Borges, Emma, Essack, Zahra, Fukui, Akihiko, Gan, Tianjun, Gary, Kaz, Ghachoui, Mourad, Gillon, Michaël, Girardin, Eric, Glidden, Ana, Gonzales, Erica J., Guerra, Pere, Horch, Elliott P., Helminiak, Krzysztof G., Howard, Andrew W., Huber, Daniel, Irwin, Jonathan M., Isopi, Giovanni, Jehin, Emmanuël, Kagetani, Taiki, Kane, Stephen R., Kawauchi, Kiyoe, Kielkopf, John F., Lewin, Pablo, Luker, Lindy, Lund, Michael B., Mallia, Franco, Mao, Shude, Massey, Bob, Matson, Rachel A., Mireles, Ismael, Mori, Mayuko, Murgas, Felipe, Narita, Norio, O`Dwyer, Tanner, Petigura, Erik A., Polanski, Alex S., Pozuelos, Francisco J., Palle, Enric, Parviainen, Hannu, Plavchan, Peter P., Relles, Howard M., Robertson, Paul, Rose, Mark E., Rowden, Pamela, Roy, Arpita, Savel, Arjun B., Schlieder, Joshua E., Schnaible, Chloe, Schwarz, Richard P., Sefako, Ramotholo, Selezneva, Aleksandra, Skinner, Brett, Stockdale, Chris, Strakhov, Ivan A., Tan, Thiam-Guan, Torres, Guillermo, Tronsgaard, René, Twicken, Joseph D., Vermilion, David, Waite, Ian A., Walter, Bradley, Wang, Gavin, Ziegler, Carl, and Zou, Yujie

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

The James Webb Space Telescope (JWST) will be able to probe the atmospheres and surface properties of hot, terrestrial planets via emission spectroscopy. We identify 18 potentially terrestrial planet candidates detected by the Transiting Exoplanet Survey Satellite (TESS) that would make ideal targets for these observations. These planet candidates cover a broad range of planet radii ($R_{\rm p} \sim 0.6 - 2.0 R_\oplus$) and orbit stars of various magnitudes ($K_s = 5.78 - 10.78$, $V = 8.4 - 15.69$) and effective temperatures ($T_{\rm eff }\sim 3000 - 6000$ K). We use ground-based observations collected through the TESS Follow-up Observing Program (TFOP) and two vetting tools -- DAVE and TRICERATOPS -- to assess the reliabilities of these candidates as planets. We validate 13 planets: TOI-206 b, TOI-500 b, TOI-544 b, TOI-833 b, TOI-1075 b, TOI-1411 b, TOI-1442 b, TOI-1693 b, TOI-1860 b, TOI-2260 b, TOI-2411 b, TOI-2427 b, and TOI-2445 b. Seven of these planets (TOI-206 b, TOI-500 b, TOI-1075 b, TOI-1442 b, TOI-2260 b, TOI-2411 b, and TOI-2445 b) are ultra-short-period planets. TOI-1860 is the youngest ($133 \pm 26$ Myr) solar twin with a known planet to date. TOI-2260 is a young ($321 \pm 96$ Myr) G dwarf that is among the most metal-rich ([Fe/H] = $0.22 \pm 0.06$ dex) stars to host an ultra-short-period planet. With an estimated equilibrium temperature of $\sim 2600$ K, TOI-2260 b is also the fourth hottest known planet with $R_{\rm p} < 2 \, R_\oplus$.

Published
2022
Full Text
View/download PDF

9. TOI-2285b: A 1.7 Earth-radius Planet Near the Habitable Zone around a Nearby M Dwarf

Author

Fukui, Akihiko, Kimura, Tadahiro, Hirano, Teruyuki, Narita, Norio, Kodama, Takanori, Hori, Yasunori, Ikoma, Masahiro, Pallé, Enric, Murgas, Felipe, Parviainen, Hannu, Kawauchi, Kiyoe, Mori, Mayuko, Esparza-Borges, Emma, Bieryla, Allyson, Irwin, Jonathan, Safonov, Boris S., Stassun, Keivan G., Alvarez-Hernandez, Leticia, Béjar, Víctor J. S., Casasayas-Barris, Núria, Chen, Guo, Crouzet, Nicolas, de Leon, Jerome P., Isogai, Keisuke, Kagetani, Taiki, Klagyivik, Peter, Korth, Judith, Kurita, Seiya, Kusakabe, Nobuhiko, Livingston, John, Luque, Rafael, Madrigal-Aguado, Alberto, Morello, Giuseppe, Nishiumi, Taku, Orell-Miquel, Jaume, Oshagh, Mahmoudreza, Sánchez-Benavente, Manuel, Stangret, Monika, Terada, Yuka, Watanabe, Noriharu, Zou, Yujie, Tamura, Motohide, Kurokawa, Takashi, Kuzuhara, Masayuki, Nishikawa, Jun, Omiya, Masashi, Vievard, Sébastien, Ueda, Akitoshi, Latham, David W., Quinn, Samuel N., Strakhov, Ivan S., Belinski, Alexandr A., Jenkins, Jon M., Ricker, George R., Seager, Sara, Vanderspek, Roland, Winn, Joshua N., Charbonneau, David, Ciardi, David R., Collins, Karen A., Doty, John P., Bachelet, Etienne, and Harbeck, Daniel

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

We report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a nearby (42 pc) M dwarf with a period of 27.3 days. We identified the transit signal from the Transiting Exoplanet Survey Satellite photometric data, which we confirmed with ground-based photometric observations using the multiband imagers MuSCAT2 and MuSCAT3. Combining these data with other follow-up observations including high resolution spectroscopy with the Tillinghast Reflector Echelle Spectrograph, high resolution imaging with the SPeckle Polarimeter, and radial velocity (RV) measurements with the InfraRed Doppler instrument, we find that the planet has a radius of 1.74 $\pm$ 0.08 $R_\oplus$, a mass of $<$ 19.5 $M_\oplus$ (95\% c.l.), and an insolation flux of 1.54 $\pm$ 0.14 times that of the Earth. Although the planet resides just outside the habitable zone for a rocky planet, if the planet harbors an H$_2$O layer under a hydrogen-rich atmosphere, then liquid water could exist on the surface of the H$_2$O layer depending on the planetary mass and water mass fraction. The bright host star in the near infrared ($K_s=9.0$) makes this planet an excellent target for further RV and atmospheric observations to improve our understanding on the composition, formation, and habitability of sub-Neptune-sized planets., Comment: 9 pages, 3 figures, published online in PASJ

Published
2021
Full Text
View/download PDF

10. Gliese 12 b: A Temperate Earth-sized Planet at 12 pc Ideal for Atmospheric Transmission Spectroscopy

Author

Kuzuhara, Masayuki, primary, Fukui, Akihiko, additional, Livingston, John H., additional, Caballero, José A., additional, de Leon, Jerome P., additional, Hirano, Teruyuki, additional, Kasagi, Yui, additional, Murgas, Felipe, additional, Narita, Norio, additional, Omiya, Masashi, additional, Orell-Miquel, Jaume, additional, Palle, Enric, additional, Changeat, Quentin, additional, Esparza-Borges, Emma, additional, Harakawa, Hiroki, additional, Hellier, Coel, additional, Hori, Yasunori, additional, Ikuta, Kai, additional, Ishikawa, Hiroyuki Tako, additional, Kodama, Takanori, additional, Kotani, Takayuki, additional, Kudo, Tomoyuki, additional, Morales, Juan C., additional, Mori, Mayuko, additional, Nagel, Evangelos, additional, Parviainen, Hannu, additional, Perdelwitz, Volker, additional, Reiners, Ansgar, additional, Ribas, Ignasi, additional, Sanz-Forcada, Jorge, additional, Sato, Bun’ei, additional, Schweitzer, Andreas, additional, Tabernero, Hugo M., additional, Takarada, Takuya, additional, Uyama, Taichi, additional, Watanabe, Noriharu, additional, Zechmeister, Mathias, additional, García, Néstor Abreu, additional, Aoki, Wako, additional, Beichman, Charles, additional, Béjar, Víctor J. S., additional, Brandt, Timothy D., additional, Calatayud-Borras, Yéssica, additional, Carleo, Ilaria, additional, Charbonneau, David, additional, Collins, Karen A., additional, Currie, Thayne, additional, Doty, John P., additional, Dreizler, Stefan, additional, Fernández-Rodríguez, Gareb, additional, Fukuda, Izuru, additional, Galán, Daniel, additional, Geraldía-González, Samuel, additional, González-Garcia, Josafat, additional, Hayashi, Yuya, additional, Hedges, Christina, additional, Henning, Thomas, additional, Hodapp, Klaus, additional, Ikoma, Masahiro, additional, Isogai, Keisuke, additional, Jacobson, Shane, additional, Janson, Markus, additional, Jenkins, Jon M., additional, Kagetani, Taiki, additional, Kambe, Eiji, additional, Kawai, Yugo, additional, Kawauchi, Kiyoe, additional, Kokubo, Eiichiro, additional, Konishi, Mihoko, additional, Korth, Judith, additional, Krishnamurthy, Vigneshwaran, additional, Kurokawa, Takashi, additional, Kusakabe, Nobuhiko, additional, Kwon, Jungmi, additional, Laza-Ramos, Andrés, additional, Libotte, Florence, additional, Luque, Rafael, additional, Madrigal-Aguado, Alberto, additional, Matsumoto, Yuji, additional, Mawet, Dimitri, additional, McElwain, Michael W., additional, Gallardo, Pedro Pablo Meni, additional, Morello, Giuseppe, additional, Torres, Sara Muñoz, additional, Nishikawa, Jun, additional, Nugroho, Stevanus K., additional, Ogihara, Masahiro, additional, Peláez-Torres, Alberto, additional, Rapetti, David, additional, Sánchez-Benavente, Manuel, additional, Schlecker, Martin, additional, Seager, Sara, additional, Serabyn, Eugene, additional, Serizawa, Takuma, additional, Stangret, Monika, additional, Takahashi, Aoi, additional, Teng, Huan-Yu, additional, Tamura, Motohide, additional, Terada, Yuka, additional, Ueda, Akitoshi, additional, Usuda, Tomonori, additional, Vanderspek, Roland, additional, Vievard, Sébastien, additional, Watanabe, David, additional, Winn, Joshua N., additional, and Zapatero Osorio, Maria Rosa, additional

Published
2024
Full Text
View/download PDF

11. Detection of an Earth-sized exoplanet orbiting the nearby ultracool dwarf star SPECULOOS-3

Author

Gillon, Michaël, primary, Pedersen, Peter P., additional, Rackham, Benjamin V., additional, Dransfield, Georgina, additional, Ducrot, Elsa, additional, Barkaoui, Khalid, additional, Burdanov, Artem Y., additional, Schroffenegger, Urs, additional, Gómez Maqueo Chew, Yilen, additional, Lederer, Susan M., additional, Alonso, Roi, additional, Burgasser, Adam J., additional, Howell, Steve B., additional, Narita, Norio, additional, de Wit, Julien, additional, Demory, Brice-Olivier, additional, Queloz, Didier, additional, Triaud, Amaury H. M. J., additional, Delrez, Laetitia, additional, Jehin, Emmanuël, additional, Hooton, Matthew J., additional, Garcia, Lionel J., additional, Jano Muñoz, Clàudia, additional, Murray, Catriona A., additional, Pozuelos, Francisco J., additional, Sebastian, Daniel, additional, Timmermans, Mathilde, additional, Thompson, Samantha J., additional, Zúñiga-Fernández, Sebastián, additional, Aceituno, Jesús, additional, Aganze, Christian, additional, Amado, Pedro J., additional, Baycroft, Thomas, additional, Benkhaldoun, Zouhair, additional, Berardo, David, additional, Bolmont, Emeline, additional, Clark, Catherine A., additional, Davis, Yasmin T., additional, Davoudi, Fatemeh, additional, de Beurs, Zoë L., additional, de Leon, Jerome P., additional, Ikoma, Masahiro, additional, Ikuta, Kai, additional, Isogai, Keisuke, additional, Fukuda, Izuru, additional, Fukui, Akihiko, additional, Gerasimov, Roman, additional, Ghachoui, Mourad, additional, Günther, Maximilian N., additional, Hasler, Samantha, additional, Hayashi, Yuya, additional, Heng, Kevin, additional, Hu, Renyu, additional, Kagetani, Taiki, additional, Kawai, Yugo, additional, Kawauchi, Kiyoe, additional, Kitzmann, Daniel, additional, Koll, Daniel D. B., additional, Lendl, Monika, additional, Livingston, John H., additional, Lyu, Xintong, additional, Meier Valdés, Erik A., additional, Mori, Mayuko, additional, McCormac, James J., additional, Murgas, Felipe, additional, Niraula, Prajwal, additional, Pallé, Enric, additional, Plauchu-Frayn, Ilse, additional, Rebolo, Rafael, additional, Sabin, Laurence, additional, Schackey, Yannick, additional, Schanche, Nicole, additional, Selsis, Franck, additional, Sota, Alfredo, additional, Stalport, Manu, additional, Standing, Matthew R., additional, Stassun, Keivan G., additional, Tamura, Motohide, additional, Terada, Yuka, additional, Theissen, Christopher A., additional, Turbet, Martin, additional, Van Grootel, Valérie, additional, Varas, Roberto, additional, Watanabe, Noriharu, additional, and Zong Lang, Francis, additional

Published
2024
Full Text
View/download PDF

12. An M dwarf accompanied by a close-in giant orbiter with SPECULOOS

Author

Triaud, Amaury H M J, primary, Dransfield, Georgina, additional, Kagetani, Taiki, additional, Timmermans, Mathilde, additional, Narita, Norio, additional, Barkaoui, Khalid, additional, Hirano, Teruyuki, additional, Rackham, Benjamin V, additional, Mori, Mayuko, additional, Baycroft, Thomas, additional, Benkhaldoun, Zouhair, additional, Burgasser, Adam J, additional, Caldwell, Douglas A, additional, Collins, Karen A, additional, Davis, Yasmin T, additional, Delrez, Laetitia, additional, Demory, Brice-Oliver, additional, Ducrot, Elsa, additional, Fukui, Akihiko, additional, Muñoz, Clàudia Jano, additional, Jehin, Emmanuël, additional, García, Lionel J, additional, Ghachoui, Mourad, additional, Gillon, Michaël, additional, Chew, Yilen Gómez Maqueo, additional, Hooton, Matthew J, additional, Ikoma, Masahiro, additional, Kawauchi, Kiyoe, additional, Kotani, Takayuki, additional, Levine, Alan M, additional, Pallé, Enric, additional, Pedersen, Peter P, additional, Pozuelos, Francisco J, additional, Queloz, Didier, additional, Scutt, Owen J, additional, Seager, Sara, additional, Sebastian, Daniel, additional, Tamura, Motohide, additional, Thompson, Samantha, additional, Watanabe, Noriharu, additional, de Wit, Julien, additional, Winn, Joshua N, additional, and Zúñiga-Fernández, Sebastián, additional

Published
2023
Full Text
View/download PDF

13. The mass of TOI-519 b: A close-in giant planet transiting a metal-rich mid-M dwarf

Author

Kagetani, Taiki, primary, Narita, Norio, additional, Kimura, Tadahiro, additional, Hirano, Teruyuki, additional, Ikoma, Masahiro, additional, Ishikawa, Hiroyuki Tako, additional, Giacalone, Steven, additional, Fukui, Akihiko, additional, Kodama, Takanori, additional, Gore, Rebecca, additional, Schroeder, Ashley, additional, Hori, Yasunori, additional, Kawauchi, Kiyoe, additional, Watanabe, Noriharu, additional, Mori, Mayuko, additional, Zou, Yujie, additional, Ikuta, Kai, additional, Krishnamurthy, Vigneshwaran, additional, Zink, Jon, additional, Hardegree-Ullman, Kevin, additional, Harakawa, Hiroki, additional, Kudo, Tomoyuki, additional, Kotani, Takayuki, additional, Kurokawa, Takashi, additional, Kusakabe, Nobuhiko, additional, Kuzuhara, Masayuki, additional, de Leon, Jerome P, additional, Livingston, John H, additional, Nishikawa, Jun, additional, Omiya, Masashi, additional, Palle, Enric, additional, Parviainen, Hannu, additional, Serizawa, Takuma, additional, Teng, Huan-Yu, additional, Ueda, Akitoshi, additional, and Tamura, Motohide, additional

Published
2023
Full Text
View/download PDF

14. The mass of TOI-519 b: A close-in giant planet transiting a metal-rich mid-M dwarf

Author

Kagetani, Taiki, Narita, Norio, Kimura, Tadahiro, Hirano, Teruyuki, Ikoma, Masahiro, Ishikawa, Hiroyuki Tako, Giacalone, Steven, Fukui, Akihiko, Kodama, Takanori, Gore, Rebecca, Schroeder, Ashley, Hori, Yasunori, Kawauchi, Kiyoe, Watanabe, Noriharu, Mori, Mayuko, Zou, Yujie, Ikuta, Kai, Krishnamurthy, Vigneshwaran, Zink, Jon K., Hardegree-Ullman, Kevin K., Harakawa, Hiroki, Kudo, Tomoyuki, Kotani, Takayuki, Kurokawa, Takashi, Kusakabe, Nobuhiko, Kuzuhara, Masayuki, de Leon, Jerome P., Livingston, John H., Nishikawa, Jun, Omiya, Masashi, Palle, Enric, Parviainen, Hannu, Serizawa, Takuma, Teng, Huan-Yu, Ueda, Akitoshi, Tamura, Motohide, Kagetani, Taiki, Narita, Norio, Kimura, Tadahiro, Hirano, Teruyuki, Ikoma, Masahiro, Ishikawa, Hiroyuki Tako, Giacalone, Steven, Fukui, Akihiko, Kodama, Takanori, Gore, Rebecca, Schroeder, Ashley, Hori, Yasunori, Kawauchi, Kiyoe, Watanabe, Noriharu, Mori, Mayuko, Zou, Yujie, Ikuta, Kai, Krishnamurthy, Vigneshwaran, Zink, Jon K., Hardegree-Ullman, Kevin K., Harakawa, Hiroki, Kudo, Tomoyuki, Kotani, Takayuki, Kurokawa, Takashi, Kusakabe, Nobuhiko, Kuzuhara, Masayuki, de Leon, Jerome P., Livingston, John H., Nishikawa, Jun, Omiya, Masashi, Palle, Enric, Parviainen, Hannu, Serizawa, Takuma, Teng, Huan-Yu, Ueda, Akitoshi, and Tamura, Motohide

Abstract

We report on the determination of the mass of TOI-519 b, a transiting substellar object around a mid-M dwarf. We carried out radial velocity measurements using Subaru/InfraRed Doppler (IRD), revealing that TOI-519 b is a planet with a mass of 0.463^(+0.082)_(-0.088) M_(Jup). We also found that the host star is metal rich ([Fe/H] = 0.27 ± 0.09 dex) and has the lowest effective temperature (T_(eff) = 3322 ± 49 K) among all stars hosting known close-in giant planets based on the IRD spectra and mid-resolution infrared spectra obtained with NASA Infrared Telescope Facility/SpeX. The core mass of TOI-519 b inferred from a thermal evolution model ranges from 0 to ∼30 M_⊕, which can be explained by both core accretion and disk instability models as the formation origins of this planet. However, TOI-519 is in line with the emerging trend that M dwarfs with close-in giant planets tend to have high metallicity, which may indicate that they formed in the core accretion model. The system is also consistent with the potential trend that close-in giant planets around M dwarfs tend to be less massive than those around FGK dwarfs.

Published
2023

15. TOI-1452 b: SPIRou and TESS Reveal a Super-Earth in a Temperate Orbit Transiting an M4 Dwarf

Author

Cadieux, Charles, primary, Doyon, René, additional, Plotnykov, Mykhaylo, additional, Hébrard, Guillaume, additional, Jahandar, Farbod, additional, Artigau, Étienne, additional, Valencia, Diana, additional, Cook, Neil J., additional, Martioli, Eder, additional, Vandal, Thomas, additional, Donati, Jean-François, additional, Cloutier, Ryan, additional, Narita, Norio, additional, Fukui, Akihiko, additional, Hirano, Teruyuki, additional, Bouchy, François, additional, Cowan, Nicolas B., additional, Gonzales, Erica J., additional, Ciardi, David R., additional, Stassun, Keivan G., additional, Arnold, Luc, additional, Benneke, Björn, additional, Boisse, Isabelle, additional, Bonfils, Xavier, additional, Carmona, Andrés, additional, Cortés-Zuleta, Pía, additional, Delfosse, Xavier, additional, Forveille, Thierry, additional, Fouqué, Pascal, additional, da Silva, João Gomes, additional, Jenkins, Jon M., additional, Kiefer, Flavien, additional, Kóspál, Ágnes, additional, Lafrenière, David, additional, Martins, Jorge H. C., additional, Moutou, Claire, additional, do Nascimento, J.-D., additional, Ould-Elhkim, Merwan, additional, Pelletier, Stefan, additional, Twicken, Joseph D., additional, Bouma, Luke G., additional, Cartwright, Scott, additional, Darveau-Bernier, Antoine, additional, Grankin, Konstantin, additional, Ikoma, Masahiro, additional, Kagetani, Taiki, additional, Kawauchi, Kiyoe, additional, Kodama, Takanori, additional, Kotani, Takayuki, additional, Latham, David W., additional, Menou, Kristen, additional, Ricker, George, additional, Seager, Sara, additional, Tamura, Motohide, additional, Vanderspek, Roland, additional, and Watanabe, Noriharu, additional

Published
2022
Full Text
View/download PDF

16. TOI-1696: A Nearby M4 Dwarf with a 3R_⊕ Planet in the Neptunian Desert

Author

Mori, Mayuko, Livingston, John H., de Leon, Jerome P., Narita, Norio, Hirano, Teruyuki, Fukui, Akihiko, Collins, Karen A., Fujita, Naho, Hori, Yasunori, Ishikawa, Hiroyuki Tako, Kawauchi, Kiyoe, Stassun, Keivan G., Watanabe, Noriharu, Giacalone, Steven, Gore, Rebecca, Schroeder, Ashley, Dressing, Courtney D., Bieryla, Allyson, Jensen, Eric L. N., Massey, Bob, Shporer, Avi, Kuzuhara, Masayuki, Charbonneau, David, Ciardi, David R., Doty, John P., Esparza-Borges, Emma, Harakawa, Hiroki, Hodapp, Klaus, Ikoma, Masahiro, Ikuta, Kai, Isogai, Keisuke, Jenkins, Jon M., Kagetani, Taiki, Kimura, Tadahiro, Kodama, Takanori, Kotani, Takayuki, Krishnamurthy, Vigneshwaran, Kudo, Tomoyuki, Kurita, Seiya, Kurokawa, Takashi, Kusakabe, Nobuhiko, Latham, David W., McLean, Brian, Murgas, Felipe, Nishikawa, Jun, Nishiumi, Taku, Omiya, Masashi, Osborn, Hugh P., Palle, Enric, Parviainen, Hannu, Ricker, George R., Seager, Sara, Serizawa, Takuma, Teng, Huan-Yu, Terada, Yuka, Twicken, Joseph D., Ueda, Akitoshi, Vanderspek, Roland, Vievard, Sébastien, Winn, Joshua N., Zou, Yujie, and Tamura, Motohide

Abstract

We present the discovery and validation of a temperate sub-Neptune around the nearby mid-M dwarf TIC 470381900 (TOI-1696), with a radius of 3.09 ± 0.11 R_⊕ and an orbital period of 2.5 days, using a combination of Transiting Exoplanets Survey Satellite (TESS) and follow-up observations using ground-based telescopes. Joint analysis of multiband photometry from TESS, Multicolor Simultaneous Camera for studying Atmospheres of Transiting exoplanets (MuSCAT), MuSCAT3, Sinistro, and KeplerCam confirmed the transit signal to be achromatic as well as refined the orbital ephemeris. High-resolution imaging with Gemini/’Alopeke and high-resolution spectroscopy with the Subaru InfraRed Doppler (IRD) confirmed that there are no stellar companions or background sources to the star. The spectroscopic observations with IRD and Infrared Telescope Facility SpeX were used to determine the stellar parameters, and it was found that the host star is an M4 dwarf with an effective temperature of T_(eff) = 3185 ± 76 K and a metallicity of [Fe/H] = 0.336 ± 0.060 dex. The radial velocities measured from IRD set a 2σ upper limit on the planetary mass to be 48.8 M_⊕. The large radius ratio (Rₚ/R_⋆ ∼ 0.1) and the relatively bright near-infrared magnitude (J = 12.2 mag) make this planet an attractive target for further follow-up observations. TOI-1696 b is one of the planets belonging to the Neptunian desert with the highest transmission spectroscopy metric discovered to date, making it an interesting candidate for atmospheric characterizations with JWST.

Published
2022

17. TOI-2119: a transiting brown dwarf orbiting an active M-dwarf from NASA’s TESS mission

Author

Carmichael, Theron W, primary, Irwin, Jonathan M, additional, Murgas, Felipe, additional, Pallé, Enric, additional, Stassun, Keivan G, additional, Bartnik, Matthew, additional, Collins, Karen A, additional, de Leon, Jerome, additional, Esparza-Borges, Emma, additional, Fedewa, Jeremy, additional, Fong, William, additional, Fukui, Akihiko, additional, Jenkins, Jon M, additional, Kagetani, Taiki, additional, Latham, David W, additional, Lund, Michael B, additional, Mann, Andrew W, additional, Moldovan, Dan, additional, Morgan, Edward H, additional, Narita, Norio, additional, Painter, Shane, additional, Parviainen, Hannu, additional, Quintana, Elisa V, additional, Ricker, George R, additional, Schulte, Jack, additional, Schwarz, Richard P, additional, Seager, Sara, additional, Sokolovsky, Kirill, additional, Twicken, Joseph D, additional, and Winn, Joshua N, additional

Published
2022
Full Text
View/download PDF

18. TOI-1696: A Nearby M4 Dwarf with a 3 R ⊕ Planet in the Neptunian Desert

Author

Mori, Mayuko, primary, Livingston, John H., additional, Leon, Jerome de, additional, Narita, Norio, additional, Hirano, Teruyuki, additional, Fukui, Akihiko, additional, Collins, Karen A., additional, Fujita, Naho, additional, Hori, Yasunori, additional, Ishikawa, Hiroyuki Tako, additional, Kawauchi, Kiyoe, additional, Stassun, Keivan G., additional, Watanabe, Noriharu, additional, Giacalone, Steven, additional, Gore, Rebecca, additional, Schroeder, Ashley, additional, Dressing, Courtney D., additional, Bieryla, Allyson, additional, Jensen, Eric L. N., additional, Massey, Bob, additional, Shporer, Avi, additional, Kuzuhara, Masayuki, additional, Charbonneau, David, additional, Ciardi, David R., additional, Doty, John P., additional, Esparza-Borges, Emma, additional, Harakawa, Hiroki, additional, Hodapp, Klaus, additional, Ikoma, Masahiro, additional, Ikuta, Kai, additional, Isogai, Keisuke, additional, Jenkins, Jon M., additional, Kagetani, Taiki, additional, Kimura, Tadahiro, additional, Kodama, Takanori, additional, Kotani, Takayuki, additional, Krishnamurthy, Vigneshwaran, additional, Kudo, Tomoyuki, additional, Kurita, Seiya, additional, Kurokawa, Takashi, additional, Kusakabe, Nobuhiko, additional, Latham, David W., additional, McLean, Brian, additional, Murgas, Felipe, additional, Nishikawa, Jun, additional, Nishiumi, Taku, additional, Omiya, Masashi, additional, Osborn, Hugh P., additional, Palle, Enric, additional, Parviainen, Hannu, additional, Ricker, George R., additional, Seager, Sara, additional, Serizawa, Takuma, additional, Teng, Huan-Yu, additional, Terada, Yuka, additional, Twicken, Joseph D., additional, Ueda, Akitoshi, additional, Vanderspek, Roland, additional, Vievard, Sébastien, additional, Winn, Joshua N., additional, Zou, Yujie, additional, and Tamura, Motohide, additional

Published
2022
Full Text
View/download PDF

19. The TESS-Keck Survey: * Science Goals and Target Selection

Author

Chontos, Ashley, primary, Murphy, Joseph M. Akana, additional, MacDougall, Mason G, additional, Fetherolf, Tara, additional, Van Zandt, Judah, additional, Rubenzahl, Ryan A., additional, Beard, Corey, additional, Huber, Daniel, additional, Batalha, Natalie M., additional, Crossfield, Ian J. M., additional, Dressing, Courtney D., additional, Fulton, Benjamin, additional, Howard, Andrew W., additional, Isaacson, Howard, additional, Kane, Stephen R., additional, Petigura, Erik A., additional, Robertson, Paul, additional, Roy, Arpita, additional, Weiss, Lauren M., additional, Behmard, Aida, additional, Dai, Fei, additional, Dalba, Paul A., additional, Giacalone, Steven, additional, Hill, Michelle L., additional, Lubin, Jack, additional, Mayo, Andrew, additional, Močnik, Teo, additional, Polanski, Alex S., additional, Rosenthal, Lee J., additional, Scarsdale, Nicholas, additional, Turtelboom, Emma V., additional, Ricker, George R., additional, Vanderspek, Roland, additional, Latham, David W., additional, Seager, Sara, additional, Winn, Joshua N., additional, Jenkins, Jon M., additional, Quinn, Samuel N., additional, Guerrero, Natalia M., additional, Collins, Karen A., additional, Ciardi, David R., additional, Shporer, Avi, additional, Goeke, Robert F., additional, Levine, Alan M., additional, Ting, Eric B., additional, Bieryla, Allyson, additional, Collins, Kevin I., additional, Kielkopf, John F., additional, Barkaoui, Khalid, additional, Benni, Paul, additional, Esparza-Borges, Emma, additional, Conti, Dennis M., additional, Hooton, Matthew J., additional, Kagetani, Taiki, additional, Laloum, Didier, additional, Marino, Giuseppe, additional, Massey, Bob, additional, Murgas, Felipe, additional, Papini, Riccardo, additional, Schwarz, Richard P., additional, Srdoc, Gregor, additional, Stockdale, Chris, additional, Wang, Gavin, additional, Wittrock, Justin M., additional, and Zou, Yujie, additional

Published
2022
Full Text
View/download PDF

20. Validation of 13 Hot and Potentially Terrestrial TESS Planets

Author

Giacalone, Steven, primary, Dressing, Courtney D., additional, Hedges, Christina, additional, Kostov, Veselin B., additional, Collins, Karen A., additional, Jensen, Eric L. N., additional, Yahalomi, Daniel A., additional, Bieryla, Allyson, additional, Ciardi, David R., additional, Howell, Steve B., additional, Lillo-Box, Jorge, additional, Barkaoui, Khalid, additional, Winters, Jennifer G., additional, Matthews, Elisabeth, additional, Livingston, John H., additional, Quinn, Samuel N., additional, Safonov, Boris S., additional, Cadieux, Charles, additional, Furlan, E., additional, Crossfield, Ian J. M., additional, Mandell, Avi M., additional, Gilbert, Emily A., additional, Kruse, Ethan, additional, Quintana, Elisa V., additional, Ricker, George R., additional, Seager, S., additional, Winn, Joshua N., additional, Jenkins, Jon M., additional, Duffy Adkins, Britt, additional, Baker, David, additional, Barclay, Thomas, additional, Barrado, David, additional, Batalha, Natalie M., additional, Belinski, Alexander A., additional, Benkhaldoun, Zouhair, additional, Buchhave, Lars A., additional, Cacciapuoti, Luca, additional, Charbonneau, David, additional, Chontos, Ashley, additional, Christiansen, Jessie L., additional, Cloutier, Ryan, additional, Collins, Kevin I., additional, Conti, Dennis M., additional, Cutting, Neil, additional, Dixon, Scott, additional, Doyon, René, additional, Mufti, Mohammed El, additional, Esparza-Borges, Emma, additional, Essack, Zahra, additional, Fukui, Akihiko, additional, Gan, Tianjun, additional, Gary, Kaz, additional, Ghachoui, Mourad, additional, Gillon, Michaël, additional, Girardin, Eric, additional, Glidden, Ana, additional, Gonzales, Erica J., additional, Guerra, Pere, additional, Horch, Elliott P., additional, Hełminiak, Krzysztof G., additional, Howard, Andrew W., additional, Huber, Daniel, additional, Irwin, Jonathan M., additional, Isopi, Giovanni, additional, Jehin, Emmanuël, additional, Kagetani, Taiki, additional, Kane, Stephen R., additional, Kawauchi, Kiyoe, additional, Kielkopf, John F., additional, Lewin, Pablo, additional, Luker, Lindy, additional, Lund, Michael B., additional, Mallia, Franco, additional, Mao, Shude, additional, Massey, Bob, additional, Matson, Rachel A., additional, Mireles, Ismael, additional, Mori, Mayuko, additional, Murgas, Felipe, additional, Narita, Norio, additional, O’Dwyer, Tanner, additional, Petigura, Erik A., additional, Polanski, Alex S., additional, Pozuelos, Francisco J., additional, Palle, Enric, additional, Parviainen, Hannu, additional, Plavchan, Peter P., additional, Relles, Howard M., additional, Robertson, Paul, additional, Rose, Mark E., additional, Rowden, Pamela, additional, Roy, Arpita, additional, Savel, Arjun B., additional, Schlieder, Joshua E., additional, Schnaible, Chloe, additional, Schwarz, Richard P., additional, Sefako, Ramatholo, additional, Selezneva, Aleksandra, additional, Skinner, Brett, additional, Stockdale, Chris, additional, Strakhov, Ivan A., additional, Tan, Thiam-Guan, additional, Torres, Guillermo, additional, Tronsgaard, René, additional, Twicken, Joseph D., additional, Vermilion, David, additional, Waite, Ian A., additional, Walter, Bradley, additional, Wang, Gavin, additional, Ziegler, Carl, additional, and Zou, Yujie, additional

Published
2022
Full Text
View/download PDF

21. TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf

Author

Fukui, Akihiko, primary, Kimura, Tadahiro, additional, Hirano, Teruyuki, additional, Narita, Norio, additional, Kodama, Takanori, additional, Hori, Yasunori, additional, Ikoma, Masahiro, additional, Pallé, Enric, additional, Murgas, Felipe, additional, Parviainen, Hannu, additional, Kawauchi, Kiyoe, additional, Mori, Mayuko, additional, Esparza-Borges, Emma, additional, Bieryla, Allyson, additional, Irwin, Jonathan, additional, Safonov, Boris S, additional, Stassun, Keivan G, additional, Alvarez-Hernandez, Leticia, additional, Béjar, Víctor J S, additional, Casasayas-Barris, Núria, additional, Chen, Guo, additional, Crouzet, Nicolas, additional, de Leon, Jerome P, additional, Isogai, Keisuke, additional, Kagetani, Taiki, additional, Klagyivik, Peter, additional, Korth, Judith, additional, Kurita, Seiya, additional, Kusakabe, Nobuhiko, additional, Livingston, John, additional, Luque, Rafael, additional, Madrigal-Aguado, Alberto, additional, Morello, Giuseppe, additional, Nishiumi, Taku, additional, Orell-Miquel, Jaume, additional, Oshagh, Mahmoudreza, additional, Sánchez-Benavente, Manuel, additional, Stangret, Monika, additional, Terada, Yuka, additional, Watanabe, Noriharu, additional, Zou, Yujie, additional, Tamura, Motohide, additional, Kurokawa, Takashi, additional, Kuzuhara, Masayuki, additional, Nishikawa, Jun, additional, Omiya, Masashi, additional, Vievard, Sébastien, additional, Ueda, Akitoshi, additional, Latham, David W, additional, Quinn, Samuel N, additional, Strakhov, Ivan S, additional, Belinski, Alexandr A, additional, Jenkins, Jon M, additional, Ricker, George R, additional, Seager, Sara, additional, Vanderspek, Roland, additional, Winn, Joshua N, additional, Charbonneau, David, additional, Ciardi, David R, additional, Collins, Karen A, additional, Doty, John P, additional, Bachelet, Etienne, additional, and Harbeck, Daniel, additional

Published
2021
Full Text
View/download PDF

22. TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf

Author

Fukui, Akihiko, Kimura, Tadahiro, Hirano, Teruyuki, Narita, Norio, Kodama, Takanori, Hori, Yasunori, Ikoma, Masahiro, Pallé, Enric, Murgas, Felipe, Parviainen, Hannu, Kawauchi, Kiyoe, Mori, Mayuko, Esparza-Borges, Emma, Bieryla, Allyson, Irwin, Jonathan, Safonov, Boris S, Stassun, Keivan G, Alvarez-Hernandez, Leticia, Béjar, Víctor J S, Casasayas-Barris, Núria, Chen, Guo, Crouzet, Nicolas, de Leon, Jerome P, Isogai, Keisuke, Kagetani, Taiki, Klagyivik, Peter, Korth, Judith, Kurita, Seiya, Kusakabe, Nobuhiko, Livingston, John, Luque, Rafael, Madrigal-Aguado, Alberto, Morello, Giuseppe, Nishiumi, Taku, Orell-Miquel, Jaume, Oshagh, Mahmoudreza, Sánchez-Benavente, Manuel, Stangret, Monika, Terada, Yuka, Watanabe, Noriharu, Zou, Yujie, Tamura, Motohide, Kurokawa, Takashi, Kuzuhara, Masayuki, Nishikawa, Jun, Omiya, Masashi, Vievard, Sébastien, Ueda, Akitoshi, Latham, David W, Quinn, Samuel N, Strakhov, Ivan S, Belinski, Alexandr A, Jenkins, Jon M, Ricker, George R, Seager, Sara, Vanderspek, Roland, Winn, Joshua N, Charbonneau, David, Ciardi, David R, Collins, Karen A, Doty, John P, Bachelet, Etienne, and Harbeck, Daniel

Abstract

We report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a nearby (42 pc) M dwarf with a period of 27.3 d. We identified the transit signal from the Transiting Exoplanet Survey Satellite photometric data, which we confirmed with ground-based photometric observations using the multiband imagers MuSCAT2 and MuSCAT3. Combining these data with other follow-up observations including high-resolution spectroscopy with the Tillinghast Reflector Echelle Spectrograph, high-resolution imaging with the SPeckle Polarimeter, and radial velocity (RV) measurements with the InfraRed Doppler instrument, we find that the planet has a radius of $1.74 \pm 0.08\, R_\oplus$, a mass of $\lt \!\!19.5\,M_\oplus$($95\%$c.l.), and an insolation flux of 1.54 ± 0.14 times that of the Earth. Although the planet resides just outside the habitable zone for a rocky planet, if the planet harbors an H2O layer under a hydrogen-rich atmosphere, then liquid water could exist on the surface of the H2O layer depending on the planetary mass and water mass fraction. The bright host star in the near-infrared (Ks= 9.0) makes this planet an excellent target for further RV and atmospheric observations to improve our understanding of the composition, formation, and habitability of sub-Neptune-sized planets.

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results