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

Bibcode
2025A&A...696A..44B
DOI
10.1051/0004-6361/202453508
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
Astronomy and Astrophysics
Número de autores
47
Número de autores del IAC
5
Número de citas
8
Número de citas referidas
4
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.
Proyectos relacionados
Image withthe projects' name
Exoplanetas y Astrobiología
La búsqueda de vida en el Universo se ha visto impulsada por los recientes descubrimientos de planetas alrededor de otras estrellas (los llamados exoplanetas), convirtiéndose en uno de los campos más activos dentro de la Astrofísica moderna. En los últimos años los descubrimientos cada vez más numerosos de nuevos exoplanetas y los últimos avances
Enric
Pallé Bago
En ejecución
Tipo
Con árbitro
Sistema Solar y Sistemas Planetarios (SEYSS)

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