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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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Hauptverfasser: Goffo, Elisa (VerfasserIn) , Chaturvedi, P. (VerfasserIn) , Murgas, F. (VerfasserIn) , Morello, G. (VerfasserIn) , Orell-Miquel, J. (VerfasserIn) , Acuña, L. (VerfasserIn) , Peña-Moñino, L. (VerfasserIn) , Pallé, E. (VerfasserIn) , Hatzes, A. P. (VerfasserIn) , Geraldía-González, S. (VerfasserIn) , Pozuelos, F. J. (VerfasserIn) , Lanza, A. F. (VerfasserIn) , Gandolfi, D. (VerfasserIn) , Caballero, J. A. (VerfasserIn) , Schlecker, M. (VerfasserIn) , Pérez-Torres, M. (VerfasserIn) , Lodieu, N. (VerfasserIn) , Schweitzer, A. (VerfasserIn) , Hellier, C. (VerfasserIn) , Jeffers, S. V. (VerfasserIn) , Duque-Arribas, C. (VerfasserIn) , Cifuentes, C. (VerfasserIn) , Béjar, V. J. S. (VerfasserIn) , Daspute, M. (VerfasserIn) , Dubois, F. (VerfasserIn) , Dufoer, S. (VerfasserIn) , Esparza-Borges, E. (VerfasserIn) , Fukui, A. (VerfasserIn) , Hayashi, Y. (VerfasserIn) , Herrero, E. (VerfasserIn) , Mori, M. (VerfasserIn) , Narita, N. (VerfasserIn) , Parviainen, H. (VerfasserIn) , Tal-Or, L. (VerfasserIn) , Vanaverbeke, S. (VerfasserIn) , Hermelo, I. (VerfasserIn) , Amado, P. J. (VerfasserIn) , Dreizler, S. (VerfasserIn) , Henning, Thomas (VerfasserIn) , Lillo-Box, J. (VerfasserIn) , Luque, R. (VerfasserIn) , Mallorquín, M. (VerfasserIn) , Nagel, E. (VerfasserIn) , Quirrenbach, Andreas (VerfasserIn) , Reffert, S. (VerfasserIn) , Reiners, A. (VerfasserIn) , Ribas, I. (VerfasserIn) , Schöfer, P. (VerfasserIn) , Tabernero, H. M. (VerfasserIn) , Zechmeister, M. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: May 2024
In: Astronomy and astrophysics
Year: 2024, Jahrgang: 685, Pages: 1-20
ISSN:1432-0746
DOI:10.1051/0004-6361/202349133
Online-Zugang: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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Verfasserangaben: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

MARC

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520 |a 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. 
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700 1 |a Orell-Miquel, J.  |e VerfasserIn  |4 aut 
700 1 |a Acuña, L.  |e VerfasserIn  |4 aut 
700 1 |a Peña-Moñino, L.  |e VerfasserIn  |4 aut 
700 1 |a Pallé, E.  |e VerfasserIn  |4 aut 
700 1 |a Hatzes, A. P.  |e VerfasserIn  |4 aut 
700 1 |a Geraldía-González, S.  |e VerfasserIn  |4 aut 
700 1 |a Pozuelos, F. J.  |e VerfasserIn  |4 aut 
700 1 |a Lanza, A. F.  |e VerfasserIn  |4 aut 
700 1 |a Gandolfi, D.  |e VerfasserIn  |4 aut 
700 1 |a Caballero, J. A.  |e VerfasserIn  |4 aut 
700 1 |a Schlecker, M.  |e VerfasserIn  |4 aut 
700 1 |a Pérez-Torres, M.  |e VerfasserIn  |4 aut 
700 1 |a Lodieu, N.  |e VerfasserIn  |4 aut 
700 1 |a Schweitzer, A.  |e VerfasserIn  |4 aut 
700 1 |a Hellier, C.  |e VerfasserIn  |4 aut 
700 1 |a Jeffers, S. V.  |e VerfasserIn  |4 aut 
700 1 |a Duque-Arribas, C.  |e VerfasserIn  |4 aut 
700 1 |a Cifuentes, C.  |e VerfasserIn  |4 aut 
700 1 |a Béjar, V. J. S.  |e VerfasserIn  |4 aut 
700 1 |a Daspute, M.  |e VerfasserIn  |4 aut 
700 1 |a Dubois, F.  |e VerfasserIn  |4 aut 
700 1 |a Dufoer, S.  |e VerfasserIn  |4 aut 
700 1 |a Esparza-Borges, E.  |e VerfasserIn  |4 aut 
700 1 |a Fukui, A.  |e VerfasserIn  |4 aut 
700 1 |a Hayashi, Y.  |e VerfasserIn  |4 aut 
700 1 |a Herrero, E.  |e VerfasserIn  |4 aut 
700 1 |a Mori, M.  |e VerfasserIn  |4 aut 
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700 1 |a Parviainen, H.  |e VerfasserIn  |4 aut 
700 1 |a Tal-Or, L.  |e VerfasserIn  |4 aut 
700 1 |a Vanaverbeke, S.  |e VerfasserIn  |4 aut 
700 1 |a Hermelo, I.  |e VerfasserIn  |4 aut 
700 1 |a Amado, P. J.  |e VerfasserIn  |4 aut 
700 1 |a Dreizler, S.  |e VerfasserIn  |4 aut 
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700 1 |a Lillo-Box, J.  |e VerfasserIn  |4 aut 
700 1 |a Luque, R.  |e VerfasserIn  |4 aut 
700 1 |a Mallorquín, M.  |e VerfasserIn  |4 aut 
700 1 |a Nagel, E.  |e VerfasserIn  |4 aut 
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700 1 |a Reffert, S.  |e VerfasserIn  |4 aut 
700 1 |a Reiners, A.  |e VerfasserIn  |4 aut 
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700 1 |a Schöfer, P.  |e VerfasserIn  |4 aut 
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