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23 April 2024

» arxiv » 2201.01713

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TIC-320687387 B: a long-period eclipsing M-dwarf close to the hydrogen burning limit
Samuel Gill ; Solene Ulmer-Moll ; Peter J. Wheatley ; Daniel Bayliss ; Matthew R. Burleigh ; Jack S. Acton ; Sarah L. Casewell ; Christopher A. Watson ; Monika Lendl ; Hannah L. Worters ; Ramotholo R. Sefako ; David R. Anderson ; Douglas R. Alves ; François Bouchy ; Edward M. Bryant ; Philipp Eigmüller ; Edward Gillen ; Michael R. Goad ; Nolan Grieves ; Maximilian N. Günther ; Beth A. Henderson ; James S. Jenkins ; Lokesh Mishra ; Maximiliano Moyano ; Hugh P. Osborn ; Rosanna H. Tilbrook ; Stéphane Udry ; Jose I. Vines ; Richard G. West ;
Date:	5 Jan 2022
Abstract:	We are using precise radial velocities from CORALIE together with precision photometry from the Next Generation Transit Survey (NGTS) to follow up stars with single-transit events detected with the Transiting Exoplanet Survey Satellite (TESS). As part of this survey we identified a single transit on the star TIC-320687387, a bright (T=11.6) G-dwarf observed by TESS in Sector 13 and 27. From subsequent monitoring of TIC-320687387 with CORALIE, NGTS, and Lesedi we determined that the companion, TIC-320687387 B,is a very low-mass star with a mass of $96.2 pm _{2.0}^{1.9} M_J$ and radius of $1.14 pm _{0.02}^{0.02} R_J$ placing it close to the hydrogen burning limit ($sim 80 M_J$). TIC-320687387 B has a wide and eccentric orbit, with a period of 29.77381 days and an eccentricity of $0.366 pm 0.003$. Eclipsing systems such as TIC-320687387 AB allow us to test stellar evolution models for low-mass stars, which in turn are needed to calculate accurate masses and radii for exoplanets orbiting single low-mass stars. The wide orbit of TIC-320687387 B makes it particularly valuable as its evolution can be assumed to be free from perturbations caused by tidal interactions with its G-type host star.
Source:	arXiv, 2201.01713
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