Bibcode
Barkaoui, K.; Sebastian, D.; Zúñiga-Fernández, S.; Triaud, A. H. M. J.; Rackham, B. V.; Burgasser, A. J.; Carmichael, T. W.; Gillon, M.; Theissen, C.; Softich, E.; Rojas-Ayala, B.; Srdoc, G.; Soubkiou, A.; Fukui, A.; Timmermans, M.; Stalport, M.; Burdanov, A.; Ciardi, D. R.; Collins, K. A.; Davis, Y. T.; Davoudi, F.; de Wit, J.; Demory, B. O.; Deveny, S.; Dransfield, G.; Ducrot, E.; Florian, L.; Gan, T.; Gómez Maqueo Chew, Y.; Hooton, M. J.; Howell, S. B.; Jenkins, J. M.; Littlefield, C.; Martín, E. L.; Murgas, F.; Niraula, P.; Palle, E.; Pedersen, P. P.; Pozuelos, F. J.; Queloz, D.; Ricker, G.; Schwarz, R. P.; Seager, S.; Shporer, A.; Scott, M. G.; Stockdale, C.; Winn, J.
Referencia bibliográfica
Astronomy and Astrophysics
Fecha de publicación:
4
2025
Revista
Número de citas
0
Número de citas referidas
0
Descripción
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.