TOI-6508 b: A massive transiting brown dwarf orbiting a low-mass star

[en] We report the discovery of a transiting brown dwarf orbiting a low-mass star, TOI-6508 b. Today, only ∼50 transiting brown dwarfs have been discovered. TOI-6508 b was first detected with data from the Transiting Exoplanet Survey Satellite (TESS) in Sectors 10, 37 and 63. Ground-based follow-up photometric data were collected with the SPECULOOS-South (Search for habitable Planets EClipsing ULtra-cOOl Stars) and LCOGT-1m telescopes, and RV measurements were obtained with the Near InfraRed Planet Searcher (NIRPS) spectrograph. We find that TOI-6508 b has a mass of Mp = 72.5−5.1+7.6 MJup and a radius of Rp = 1.03 ± 0.03 RJup. Our modeling shows that the data are consistent with an eccentric orbit of 19 day and an eccentricity of e = 0.28−0.08+0.09. TOI-6508 b has a mass ratio of MBD/M★ = 0.40, makes it the second highest mass ratio brown dwarf that transits a low-mass star. The host has a mass of M★ = 0.174 ± 0.004 M⊙, a radius of R★ = 0.205 ± 0.006 R⊙, an effective temperature of Teff = 2930 ± 70 K, and a metallicity of [Fe/H] = −0.22 ± 0.08. This makes TOI-6508 b an interesting discovery that has come to light in a region still sparsely populated.

Research Center/Unit :

Astrobiology Research Unit, Université de Liège, Allée du 6 Août 19C, 4000 Liège, Belgium

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Barkaoui, Khalid ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > COMets METeors and Asteroids (COMETA)

Zúñiga Fernández, Sebastián Gaspar ; Université de Liège - ULiège > Astrobiology

Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)

Timmermans, Mathilde ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > COMets METeors and Asteroids (COMETA)

Stalport, Manu ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)

Davoudi, Fatemeh ; Université de Liège - ULiège > Astrobiology

Language :

English

Title :

TOI-6508 b: A massive transiting brown dwarf orbiting a low-mass star

Publication date :

02 April 2025

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences

Volume :

696

Pages :

A44

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://www.aanda.org/10.1051/0004-6361/202453508/pdf

Available on ORBi :

since 05 May 2025

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