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NGTS-28Ab: A short period transiting brown dwarf

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arxiv 2402.09943 v1 pith:UP5K2JAB submitted 2024-02-15 astro-ph.EP astro-ph.SR

NGTS-28Ab: A short period transiting brown dwarf

Beth A. Henderson , Sarah L. Casewell , Michael R. Goad , Jack S. Acton , Maximilian N. G\"unther , Louise D. Nielsen , Matthew R. Burleigh , Claudia Belardi
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Rosanna H. Tilbrook Oliver Turner Steve B. Howell Catherine A. Clark Colin Littlefield Khalid Barkaoui Douglas R. Alves David R. Anderson Daniel Bayliss Francois Bouchy Edward M. Bryant George Dransfield Elsa Ducrot Philipp Eigm\"uller Samuel Gill Edward Gillen Micha\"el Gillon Faith Hawthorn Matthew J. Hooton James A. G. Jackman Emmanuel Jehin James S. Jenkins Alicia Kendall Monika Lendl James McCormac Maximiliano Moyano Peter Pihlmann Pedersen Francisco J. Pozuelos Gavin Ramsay Ramotholo R. Sefako Mathilde Timmermans Amaury H. M. J. Triaud Stephane Udry Jose I. Vines Christopher A. Watson Richard G. West Peter J. Wheatley Sebasti\'an Z\'u\~niga-Fern\'andez
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keywords browndwarfdiscoveryfoundngts-28abperiodmassafrican
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We report the discovery of a brown dwarf orbiting a M1 host star. We first identified the brown dwarf within the Next Generation Transit Survey data, with supporting observations found in TESS sectors 11 and 38. We confirmed the discovery with follow-up photometry from the South African Astronomical Observatory, SPECULOOS-S, and TRAPPIST-S, and radial velocity measurements from HARPS, which allowed us to characterise the system. We find an orbital period of ~1.25 d, a mass of 69.0+5.3-4.8 MJ, close to the Hydrogen burning limit, and a radius of 0.95 +- 0.05 RJ. We determine the age to be >0.5 Gyr, using model isochrones, which is found to be in agreement with SED fitting within errors. NGTS-28Ab is one of the shortest period systems found within the brown dwarf desert, as well as one of the highest mass brown dwarfs that transits an M dwarf. This makes NGTS-28Ab another important discovery within this scarcely populated region.

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  1. On the Eccentricity Distribution and Tidal Evolution of Transiting Brown Dwarfs

    astro-ph.EP 2026-07 conditional novelty 6.0

    Short-period (P<16 d) transiting brown dwarfs are low-eccentricity while longer-period ones are more excited; assuming a shared primordial Beta distribution, tidal evolution constrains Q_BD ≈ 10^{7.1–8.1}.