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TIC-320687387 B: a long-period eclipsing M-dwarf close to the hydrogen burning limit

Gill, Samuel and Ulmer-Moll, Solène and Wheatley, Peter J. and Bayliss, Daniel and Burleigh, Matthew R. and Acton, Jack S. and Casewell, Sarah L. and Watson, Christopher A. and Lendl, Monika and Worters, Hannah L. and Sefako, Ramotholo R. and Anderson, David R. and Alves, Douglas R. and Bouchy, François and Bryant, Edward M. and Eigmüller, Philipp and Gillen, Edward and Goad, Michael R. and Grieves, Nolan and Günther, Maximilian N. and Henderson, Beth A. and Jenkins, James S. and Mishra, Lokesh and Moyano, Maximiliano and Osborn, Hugh P. and Tilbrook, Rosanna H. and Udry, Stephane and Vines, Jose I. and West, Richard G. (2022) TIC-320687387 B: a long-period eclipsing M-dwarf close to the hydrogen burning limit. Monthly Notices of the Royal Astronomical Society, 513 (2), pp. 1785-1793. Oxford University Press. doi: 10.1093/mnras/stac798. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/513/2/1785/6555473

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 Sectors 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±1.92.0 MJ and radius of 1.14±0.020.02 RJ placing it close to the hydrogen burning limit (~80 MJ). TIC-320687387 B is tidally decoupled and has an eccentric orbit, with a period of 29.77381 d and an eccentricity of 0.366 ± 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 sizeable orbital period 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.

Item URL in elib:https://elib.dlr.de/188424/
Document Type:Article
Title:TIC-320687387 B: a long-period eclipsing M-dwarf close to the hydrogen burning limit
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gill, SamuelCentre for Exoplanets and Habitability, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UK Dept. of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Ulmer-Moll, SolèneObservatoire de Gen `eve, Universit ́e de Gen `eve, Chemin Pegasi 51, CH-1290 Sauverny, SwitzerlandUNSPECIFIED
Wheatley, Peter J.University of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIED
Bayliss, DanielUniversity of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIED
Burleigh, Matthew R.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Acton, Jack S.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Casewell, Sarah L.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Watson, Christopher A.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UKUNSPECIFIED
Lendl, MonikaObservatoire Astronomique de l'Université de Genéve, Versoix, Switzerland; Space Research Institute, Austrian Academy of Sciences, Graz, AustriaUNSPECIFIED
Worters, Hannah L.South African Astronomical Observatory, PO Box 9, Observatory, Cape Town 7935, South AfricaUNSPECIFIED
Sefako, Ramotholo R.South African Astronomical Observatory, PO Box 9, Observatory, Cape Town 7935, South AfricaUNSPECIFIED
Anderson, David R.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Alves, Douglas R.Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, ChileUNSPECIFIED
Bouchy, FrançoisObservatoire de Genève, Université de Genève, 51 Ch. des Maillettes, CH-1290 Sauverny, SwitzerlandUNSPECIFIED
Bryant, Edward M.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Gillen, EdwardAstrophysics Group, Cavendish Laboratory , J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Goad, Michael R.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Grieves, NolanObservatoire astronomique de l'Université de Genève, Chemin des maillettes 51, 1290 Sauverny, SwitzerlandUNSPECIFIED
Günther, Maximilian N.Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USAUNSPECIFIED
Henderson, Beth A.School of Physics and Astronomy, University of Leicester, LE1 7RH, UKUNSPECIFIED
Jenkins, James S.Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile; Centro de Astrofísica y Tecnologías Afines (CATA), Casilla 36-D, Santiago, ChileUNSPECIFIED
Mishra, LokeshObservatoire de Gen `eve, Universit ́e de Gen `eve, Chemin Pegasi 51, CH-1290 Sauverny, SwitzerlandUNSPECIFIED
Moyano, MaximilianoInstituto de Astronomía, Universidad Católica del Norte , Angamos 0610, 1270709 Antofagasta, ChileUNSPECIFIED
Osborn, Hugh P.Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 70 Vassar Street, Cambridge, MA 02139, USA; NCCR/PlanetS, Centre for Space & Habitability, University of Bern, Bern, SwitzerlandUNSPECIFIED
Tilbrook, Rosanna H.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Udry, StephaneObservatoire Astronomique de l'Université de Genève, 51 Ch. des Maillettes, CH-1290 Versoix, SwitzerlandUNSPECIFIED
Vines, Jose I.Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, ChileUNSPECIFIED
West, Richard G.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Date:2022
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:513
DOI:10.1093/mnras/stac798
Page Range:pp. 1785-1793
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:binaries: eclipsing, Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Eigmüller, Dr. Philipp
Deposited On:22 Sep 2022 16:26
Last Modified:11 Jan 2023 13:11

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