TOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization
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2024
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| author | Goffo, E. Chaturvedi, P. Murgas, F. Morello, G. Orell-Miquel, J. Acuña, L. Peña-Moñino, L. Pallé, E. Hatzes, A. P. Geraldía-González, S. Pozuelos, F. J. Lanza, A. F. Gandolfi, D. Caballero, J. A. Schlecker, M. Pérez-Torres, M. Lodieu, N. Schweitzer, A. Hellier, C. Jeffers, S. V. Duque-Arribas, C. Cifuentes, C. Béjar, V. J. S. Daspute, M. Dubois, F. Dufoer, S. Esparza-Borges, E. Fukui, A. Hayashi, Y. Herrero, E. Mori, M. Narita, N. Parviainen, H. Tal-Or, L. Vanaverbeke, S. Hermelo, I. Amado, P. J. Dreizler, S. Henning, Th. Lillo-Box, J. Luque, R. Mallorquín, M. Nagel, E. Quirrenbach, A. Reffert, S. Reiners, A. Ribas, I. Schöfer, P. Tabernero, H. M. Zechmeister, M. |
| author_facet | Goffo, E. Chaturvedi, P. Murgas, F. Morello, G. Orell-Miquel, J. Acuña, L. Peña-Moñino, L. Pallé, E. Hatzes, A. P. Geraldía-González, S. Pozuelos, F. J. Lanza, A. F. Gandolfi, D. Caballero, J. A. Schlecker, M. Pérez-Torres, M. Lodieu, N. Schweitzer, A. Hellier, C. Jeffers, S. V. Duque-Arribas, C. Cifuentes, C. Béjar, V. J. S. Daspute, M. Dubois, F. Dufoer, S. Esparza-Borges, E. Fukui, A. Hayashi, Y. Herrero, E. Mori, M. Narita, N. Parviainen, H. Tal-Or, L. Vanaverbeke, S. Hermelo, I. Amado, P. J. Dreizler, S. Henning, Th. Lillo-Box, J. Luque, R. Mallorquín, M. Nagel, E. Quirrenbach, A. Reffert, S. Reiners, A. Ribas, I. Schöfer, P. Tabernero, H. M. Zechmeister, M. |
| contents | We report the confirmation and mass determination of a mini-Neptune transiting the M3.5 V star TOI-4438 (G 182-34) every 7.44 days. A transit signal was detected with NASA's TESS space mission in the sectors 40, 52, and 53. In order to validate the planet TOI-4438 b and to determine the system properties, we combined TESS data with high-precision radial velocity measurements from the CARMENES spectrograph, spanning almost one year, and ground-based transit photometry. We found that TOI-4438 b has a radius of Rb = 2.52 +/- 0.13 R_Earth (5% precision), which together with a mass of Mb=5.4 +/- 1.1 M_Earth (20% precision), results in a bulk density of rho = 1.85+0.51-0.44 g cm-3 (28% precision), aligning the discovery with a volatile-rich planet. Our interior structure retrieval with a pure water envelope yields a minimum water mass fraction of 46% (1-sigma). TOI-4438 b is a volatile-rich mini-Neptune with likely H/He mixed with molecules, such as water, CO_2, and CH_4. The primary star has a J-band magnitude of 9.7, and the planet has a high transmission spectroscopy metric (TSM) of 136 +/- 13. Taking into account the relatively warm equilibrium temperature of T_eq = 435 +/- 15 K, and the low activity level of its host star, TOI-4438 b is one of the most promising mini-Neptunes around an M dwarf for transmission spectroscopy studies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_09833 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | TOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization Goffo, E. Chaturvedi, P. Murgas, F. Morello, G. Orell-Miquel, J. Acuña, L. Peña-Moñino, L. Pallé, E. Hatzes, A. P. Geraldía-González, S. Pozuelos, F. J. Lanza, A. F. Gandolfi, D. Caballero, J. A. Schlecker, M. Pérez-Torres, M. Lodieu, N. Schweitzer, A. Hellier, C. Jeffers, S. V. Duque-Arribas, C. Cifuentes, C. Béjar, V. J. S. Daspute, M. Dubois, F. Dufoer, S. Esparza-Borges, E. Fukui, A. Hayashi, Y. Herrero, E. Mori, M. Narita, N. Parviainen, H. Tal-Or, L. Vanaverbeke, S. Hermelo, I. Amado, P. J. Dreizler, S. Henning, Th. Lillo-Box, J. Luque, R. Mallorquín, M. Nagel, E. Quirrenbach, A. Reffert, S. Reiners, A. Ribas, I. Schöfer, P. Tabernero, H. M. Zechmeister, M. Earth and Planetary Astrophysics We report the confirmation and mass determination of a mini-Neptune transiting the M3.5 V star TOI-4438 (G 182-34) every 7.44 days. A transit signal was detected with NASA's TESS space mission in the sectors 40, 52, and 53. In order to validate the planet TOI-4438 b and to determine the system properties, we combined TESS data with high-precision radial velocity measurements from the CARMENES spectrograph, spanning almost one year, and ground-based transit photometry. We found that TOI-4438 b has a radius of Rb = 2.52 +/- 0.13 R_Earth (5% precision), which together with a mass of Mb=5.4 +/- 1.1 M_Earth (20% precision), results in a bulk density of rho = 1.85+0.51-0.44 g cm-3 (28% precision), aligning the discovery with a volatile-rich planet. Our interior structure retrieval with a pure water envelope yields a minimum water mass fraction of 46% (1-sigma). TOI-4438 b is a volatile-rich mini-Neptune with likely H/He mixed with molecules, such as water, CO_2, and CH_4. The primary star has a J-band magnitude of 9.7, and the planet has a high transmission spectroscopy metric (TSM) of 136 +/- 13. Taking into account the relatively warm equilibrium temperature of T_eq = 435 +/- 15 K, and the low activity level of its host star, TOI-4438 b is one of the most promising mini-Neptunes around an M dwarf for transmission spectroscopy studies. |
| title | TOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2403.09833 |