NGTS-28Ab: a short period transiting brown dwarf

Bibcode
2024MNRAS.530..318H
DOI
10.1093/mnras/stae508
Henderson, Beth A.; Casewell, Sarah L.; Goad, Michael R.; Acton, Jack S.; Günther, Maximilian N.; Nielsen, Louise D.; Burleigh, Matthew R.; Belardi, Claudia; Tilbrook, Rosanna H.; Turner, Oliver; Howell, Steve B.; Clark, Catherine A.; Littlefield, Colin; Barkaoui, Khalid; Alves, Douglas R.; Anderson, David R.; Bayliss, Daniel; Bouchy, Francois; Bryant, Edward M.; Dransfield, George; Ducrot, Elsa; Eigmüller, Philipp; Gill, Samuel; Gillen, Edward; Gillon, Michaël; Hawthorn, Faith; Hooton, Matthew J.; Jackman, James A. G.; Jehin, Emmanuel; Jenkins, James S.; Kendall, Alicia; Lendl, Monika; McCormac, James; Moyano, Maximiliano; Pedersen, Peter Pihlmann; Pozuelos, Francisco J.; Ramsay, Gavin; Sefako, Ramotholo R.; Timmermans, Mathilde; Triaud, Amaury H. M. J.; Udry, Stephane; Vines, Jose I.; Watson, Christopher A.; West, Richard G.; Wheatley, Peter J.; Zúñiga-Fernández, Sebastián
Bibliographical reference

Monthly Notices of the Royal Astronomical Society

Advertised on:
5
2024
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
46
IAC number of authors
1
Citations
0
Refereed citations
0
Description
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 characterize 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 spectral energy distribution 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.
Type
Refereed

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