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TOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization

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 prope...

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Main Authors: Goffo, Elisa (Author) , Chaturvedi, P. (Author) , Murgas, F. (Author) , Morello, G. (Author) , Orell-Miquel, J. (Author) , Acuña, L. (Author) , Peña-Moñino, L. (Author) , Pallé, E. (Author) , Hatzes, A. P. (Author) , Geraldía-González, S. (Author) , Pozuelos, F. J. (Author) , Lanza, A. F. (Author) , Gandolfi, D. (Author) , Caballero, J. A. (Author) , Schlecker, M. (Author) , Pérez-Torres, M. (Author) , Lodieu, N. (Author) , Schweitzer, A. (Author) , Hellier, C. (Author) , Jeffers, S. V. (Author) , Duque-Arribas, C. (Author) , Cifuentes, C. (Author) , Béjar, V. J. S. (Author) , Daspute, M. (Author) , Dubois, F. (Author) , Dufoer, S. (Author) , Esparza-Borges, E. (Author) , Fukui, A. (Author) , Hayashi, Y. (Author) , Herrero, E. (Author) , Mori, M. (Author) , Narita, N. (Author) , Parviainen, H. (Author) , Tal-Or, L. (Author) , Vanaverbeke, S. (Author) , Hermelo, I. (Author) , Amado, P. J. (Author) , Dreizler, S. (Author) , Henning, Thomas (Author) , Lillo-Box, J. (Author) , Luque, R. (Author) , Mallorquín, M. (Author) , Nagel, E. (Author) , Quirrenbach, Andreas (Author) , Reffert, S. (Author) , Reiners, A. (Author) , Ribas, I. (Author) , Schöfer, P. (Author) , Tabernero, H. M. (Author) , Zechmeister, M. (Author)
Format: Article (Journal)
Language:English
Published: May 2024
In: Astronomy and astrophysics
Year: 2024, Volume: 685, Pages: 1-20
ISSN:1432-0746
DOI:10.1051/0004-6361/202349133
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202349133
Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2024/05/aa49133-23/aa49133-23.html
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Author Notes:E. Goffo, P. Chaturvedi, F. Murgas, G. Morello, J. Orell-Miquel, L. Acuña, L. Peña-Moñino, E. Pallé, A.P. Hatzes, S. Geraldía-González, F.J. Pozuelos, A.F. Lanza, D. Gandolfi, J.A. Caballero, M. Schlecker, M. Pérez-Torres, N. Lodieu, A. Schweitzer, C. Hellier, S.V. Jeffers, C. Duque-Arribas, C. Cifuentes, V.J.S. Béjar, M. Daspute, F. Dubois, S. Dufoer, E. Esparza-Borges, A. Fukui, Y. Hayashi, E. Herrero, M. Mori, N. Narita, H. Parviainen, L. Tal-Or, S. Vanaverbeke, I. Hermelo, P.J. Amado, S. Dreizler, Th Henning, J. Lillo-Box, R. Luque, M. Mallorquín, E. Nagel, A. Quirrenbach, S. Reffert, A. Reiners, I. Ribas, P. Schöfer, H.M. Tabernero, and M. Zechmeister
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Summary: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⊕ (5% precision), which together with a mass of Mb = 5.4 ± 1.1 M⊕ (20% precision), results in a bulk density of ρb = 1.85−0.44+0.51 g cm−3 (~28% precision), aligning the discovery with a volatile-rich planet. Our interior structure retrieval with a pure water envelope yields aminimum water mass fraction of 46% (1σ). TOI-4438 b is a volatile-rich mini-Neptune with likely H/He mixed with molecules, such as water, CO2, and CH4. 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 Teq = 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.
Item Description:Online veröffentlicht: 22. Mai 2024
Gesehen am 27.02.2025
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202349133

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