SIMBAD references

2025A&A...696A..44B - Astronomy and Astrophysics, volume 696A44 (2025/4-1)

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

BARKAOUI K., SEBASTIAN D., ZUNIGA-FERNANDEZ 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., GOMEZ MAQUEO CHEW Y., HOOTON M.J., HOWELL S.B., JENKINS J.M., LITTLEFIELD C., MARTIN 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. and WINN J.

Abstract (from CDS):

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+7.6MJup 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.

Abstract Copyright: © The Authors 2025

Journal keyword(s): brown dwarfs - stars: individual: TOI-6508

Simbad objects: 81

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