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

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Main Authors:	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., Chew, Y. Gómez Maqueo, 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.
Format:	Preprint
Published:	2025
Subjects:	Earth and Planetary Astrophysics Solar and Stellar Astrophysics
Online Access:	Acceder al recurso
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_version_	1866912250299678720
author	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. Chew, Y. Gómez Maqueo 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.
author_facet	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. Chew, Y. Gómez Maqueo 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.
contents	We report the discovery of a transiting brown dwarf orbiting a low-mass star, TOI-6508b. Today, only ~50 transiting brown dwarfs have been discovered. TOI-6508b 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 and LCOGT-1.0m telescopes, and RV measurements were obtained with the Near InfraRed Planet Searcher (NIRPS) spectrograph. We find that TOI-6508b has a mass of Mp=72.5+7.6-5.1MJup and a radius of Rp=1.03+/-0.03RJup. Our modeling shows that the data are consistent with an eccentric orbit of 19day and an eccentricity of e=0.28+0.09-0.08. TOI-6508b has a mass ratio of M_BD/Ms=0.40, makes it the second highest mass ratio brown dwarf that transits a low-mass star. The host has a mass of Ms=0.174+/-0.004M_Sun, a radius of Rs=0.205+/-0.006R_Sun, an effective temperature of Teff=2930+/-70K, and a metallicity of [Fe/H]=-0.22+/-0.08. This makes TOI-6508b an interesting discovery that has come to light in a region still sparsely populated.
format	Preprint
id	arxiv_https___arxiv_org_abs_2502_19940
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	TOI-6508b: A massive transiting brown dwarf orbiting a low-mass star 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. Chew, Y. Gómez Maqueo 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. Earth and Planetary Astrophysics Solar and Stellar Astrophysics We report the discovery of a transiting brown dwarf orbiting a low-mass star, TOI-6508b. Today, only ~50 transiting brown dwarfs have been discovered. TOI-6508b 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 and LCOGT-1.0m telescopes, and RV measurements were obtained with the Near InfraRed Planet Searcher (NIRPS) spectrograph. We find that TOI-6508b has a mass of Mp=72.5+7.6-5.1MJup and a radius of Rp=1.03+/-0.03RJup. Our modeling shows that the data are consistent with an eccentric orbit of 19day and an eccentricity of e=0.28+0.09-0.08. TOI-6508b has a mass ratio of M_BD/Ms=0.40, makes it the second highest mass ratio brown dwarf that transits a low-mass star. The host has a mass of Ms=0.174+/-0.004M_Sun, a radius of Rs=0.205+/-0.006R_Sun, an effective temperature of Teff=2930+/-70K, and a metallicity of [Fe/H]=-0.22+/-0.08. This makes TOI-6508b an interesting discovery that has come to light in a region still sparsely populated.
title	TOI-6508b: A massive transiting brown dwarf orbiting a low-mass star
topic	Earth and Planetary Astrophysics Solar and Stellar Astrophysics
url	https://arxiv.org/abs/2502.19940