Year: 2025
Type: article
Abstract: 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.
Authors: K. Barkaoui, D. Sebastian, S. Zúñiga-Fernández, A. H. M. J. Triaud, B. V. Rackham, A. J. Burgasser, T. W. Carmichael, M. Gillon, C. Theissen, E. Softich, B. Rojas-Ayala, G. Srdoc, A. Soubkiou, A. Fukui, M. Timmermans, M. Stalport, A. Burdanov, D. R. Ciardi, K. A. Collins, Y. T. Davis, F. Davoudi, J. de Wit, B. O. Demory, S. Deveny, G. Dransfield, E. Ducrot, L. Florian, T. Gan, Y. Gómez Maqueo Chew, M. J. Hooton, S. B. Howell, J. M. Jenkins, C. Littlefield, E. L. Martín, F. Murgas, P. Niraula, E. Palle, P. P. Pedersen, F. J. Pozuelos, D. Queloz, G. Ricker, R. P. Schwarz, S. Seager, A. Shporer, M. G. Scott, C. Stockdale, J. Winn
Institutions: University of Birmingham, University of Liège, Massachusetts Institute of Technology, University of California San Diego, University of Hawaiʻi at Mānoa, University of Hawaii System, University of Tarapacá, Cadi Ayyad University, Instituto de Astrofísica de Canarias, The University of Tokyo, California Institute of Technology, NASA Exoplanet Science Institute, Infrared Processing and Analysis Center, Center for Astrophysics Harvard & Smithsonian, University of Bern, Center for Space and Habitability, Ames Research Center, Bay Area Environmental Research Institute, Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Astrophysique, Instrumentation et Modélisation, CEA Paris-Saclay, ETH Zurich, Institute for Particle Physics and Astrophysics, Université de Montréal, Tsinghua University, University of Cambridge, Universidad de La Laguna, Instituto de Astrofísica de Andalucía, Princeton University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, National Aeronautics and Space Administration, California Institute of Technology, Space Telescope Science Institute, European Commission, Fonds De La Recherche Scientifique - FNRS, Fédération Wallonie-Bruxelles, Ministry of Science, ICT and Future Planning, Korea Astronomy and Space Science Institute, European Southern Observatory, Ministerio de Ciencia e Innovación, Ministério da Ciência, Tecnologia, Inovações e Comunicações, Agencia Nacional de Investigación y Desarrollo, Ames Research Center, Science Mission Directorate, Science and Technology Facilities Council, Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture, Agencia Estatal de Investigación
Awards: G101150294, G121809054, G1381791653, G1814045685, G1853635042, Red-enhanced cameras to seek rocky planets transiting Ultra-Cool Dwarfs, G2171960263, G2191281307, G2579336268, G2660406951, G3106129878, G3207356259, G3480869486, G3518538256, G4126913923, G4252671623, G433322167, G4334099265, G4442677895, G4518818167, G4526231891, G463062595, G4641790177, G5811331711, G58316358, G5894067328, G598287527, G6201089904, G6273510985, Temperate exoplanets from Chile & Antarctica, G6686480456, G7084143925, G7518687652, G767601387, G7719629023, G8210229802, G8211471405, Alexander von Humboldt and the Globalization of Science: Networks of Knowledge between Germany and the United States in the 19th Century, Running costs of the Ganymede Telescope., G8597195001, G8722425573, G878044590, G8920660035, G896728979
OpenAlex ID: W6959737436
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