학술논문
NGTS-28Ab: a short period transiting brown dwarf.
Document Type
Article
Author
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
Source
Subject
*BROWN dwarf stars
*SPECTRAL energy distribution
*DWARF stars
*ASTRONOMICAL observatories
*VELOCITY measurements
*
*
*
*
Language
ISSN
0035-8711
Abstract
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 |$69.0^{+5.3}_{-4.8}$| M J, close to the hydrogen burning limit, and a radius of 0.95 ± 0.05 R J. 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. [ABSTRACT FROM AUTHOR]