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

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; M. Zechmeister

doi:10.1051/0004-6361/202349133

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

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. JeffersC. 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, M. Zechmeister

Department of Physics

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Abstract

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 R_b = 2.52 ± 0.13 R_⊕ (5% precision), which together with a mass of M_b = 5.4 ± 1.1 M_⊕ (20% precision), results in a bulk density of ρ_b = 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 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.

Original language	English
Article number	A147
Journal	Astronomy and Astrophysics
Volume	685
DOIs	https://doi.org/10.1051/0004-6361/202349133
State	Published - 1 May 2024

Keywords

Planets and satellites: composition
Planets and satellites: detection
Techniques: photometric
Techniques: radial velocities

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10.1051/0004-6361/202349133

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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., ... Zechmeister, M. (2024). TOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization. Astronomy and Astrophysics, 685, Article A147. https://doi.org/10.1051/0004-6361/202349133

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title = "TOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization",

abstract = "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.",

keywords = "Planets and satellites: composition, Planets and satellites: detection, Techniques: photometric, Techniques: radial velocities",

author = "E. Goffo and P. Chaturvedi and F. Murgas and G. Morello and J. Orell-Miquel and L. Acu{\~n}a and L. Pe{\~n}a-Mo{\~n}ino and E. Pall{\'e} and Hatzes, {A. P.} and S. Gerald{\'i}a-Gonz{\'a}lez and Pozuelos, {F. J.} and Lanza, {A. F.} and D. Gandolfi and Caballero, {J. A.} and M. Schlecker and M. P{\'e}rez-Torres and N. Lodieu and A. Schweitzer and C. Hellier and Jeffers, {S. V.} and C. Duque-Arribas and C. Cifuentes and B{\'e}jar, {V. J.S.} and M. Daspute and F. Dubois and S. Dufoer and E. Esparza-Borges and A. Fukui and Y. Hayashi and E. Herrero and M. Mori and N. Narita and H. Parviainen and L. Tal-Or and S. Vanaverbeke and I. Hermelo and Amado, {P. J.} and S. Dreizler and Th Henning and J. Lillo-Box and R. Luque and M. Mallorqu{\'i}n and E. Nagel and A. Quirrenbach and S. Reffert and A. Reiners and I. Ribas and P. Sch{\"o}fer and Tabernero, {H. M.} and M. Zechmeister",

year = "2024",

month = may,

day = "1",

doi = "10.1051/0004-6361/202349133",

language = "אנגלית",

volume = "685",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

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Goffo, E, Chaturvedi, P, Murgas, F, Morello, G, Orell-Miquel, J, Acuña, L, Peña-Moñino, L, Pallé, E, Hatzes, AP, Geraldía-González, S, Pozuelos, FJ, Lanza, AF, Gandolfi, D, Caballero, JA, Schlecker, M, Pérez-Torres, M, Lodieu, N, Schweitzer, A, Hellier, C, Jeffers, SV, Duque-Arribas, C, Cifuentes, C, Béjar, VJS, 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, PJ, Dreizler, S, Henning, T, Lillo-Box, J, Luque, R, Mallorquín, M, Nagel, E, Quirrenbach, A, Reffert, S, Reiners, A, Ribas, I, Schöfer, P, Tabernero, HM & Zechmeister, M 2024, 'TOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization', Astronomy and Astrophysics, vol. 685, A147. https://doi.org/10.1051/0004-6361/202349133

TY - JOUR

T1 - TOI-4438 b

T2 - a transiting mini-Neptune amenable to atmospheric characterization

AU - Goffo, E.

AU - Chaturvedi, P.

AU - Murgas, F.

AU - Morello, G.

AU - Orell-Miquel, J.

AU - Acuña, L.

AU - Peña-Moñino, L.

AU - Pallé, E.

AU - Hatzes, A. P.

AU - Geraldía-González, S.

AU - Pozuelos, F. J.

AU - Lanza, A. F.

AU - Gandolfi, D.

AU - Caballero, J. A.

AU - Schlecker, M.

AU - Pérez-Torres, M.

AU - Lodieu, N.

AU - Schweitzer, A.

AU - Hellier, C.

AU - Jeffers, S. V.

AU - Duque-Arribas, C.

AU - Cifuentes, C.

AU - Béjar, V. J.S.

AU - Daspute, M.

AU - Dubois, F.

AU - Dufoer, S.

AU - Esparza-Borges, E.

AU - Fukui, A.

AU - Hayashi, Y.

AU - Herrero, E.

AU - Mori, M.

AU - Narita, N.

AU - Parviainen, H.

AU - Tal-Or, L.

AU - Vanaverbeke, S.

AU - Hermelo, I.

AU - Amado, P. J.

AU - Dreizler, S.

AU - Henning, Th

AU - Lillo-Box, J.

AU - Luque, R.

AU - Mallorquín, M.

AU - Nagel, E.

AU - Quirrenbach, A.

AU - Reffert, S.

AU - Reiners, A.

AU - Ribas, I.

AU - Schöfer, P.

AU - Tabernero, H. M.

AU - Zechmeister, M.

PY - 2024/5/1

Y1 - 2024/5/1

N2 - 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.

AB - 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.

KW - Planets and satellites: composition

KW - Planets and satellites: detection

KW - Techniques: photometric

KW - Techniques: radial velocities

UR - http://www.scopus.com/inward/record.url?scp=85194037344&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/202349133

DO - 10.1051/0004-6361/202349133

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:85194037344

SN - 0004-6361

VL - 685

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A147

ER -

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

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