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

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Gill, Samuel, Ulmer-Moll, Solène, Wheatley, Peter J., Bayliss, Daniel D. R., Burleigh, Matthew R., Acton, Jack S., Casewell, Sarah L., Watson, Christopher A., Lendl, Monika, Worters, Hannah L. et al.
(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. doi:10.1093/mnras/stac798 ISSN 1365-2966.

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Official URL: https://doi.org/10.1093/mnras/stac798

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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 $96.2 \pm _{2.0}^{1.9}$ MJ and radius of $1.14 \pm _{0.02}^{0.02}$ 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 days 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 Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Dwarf stars, Eclipsing binaries, Astronomical photometry
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press (OUP)
ISSN: 1365-2966
Official Date: June 2022
Dates:
DateEvent
June 2022Published
29 March 2022Available
16 March 2022Accepted
Volume: 513
Number: 2
Page Range: pp. 1785-1793
DOI: 10.1093/mnras/stac798
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 10 June 2022
Date of first compliant Open Access: 10 June 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ST/M001962/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
ST/S002642/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
ST/L000733/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
ST/P000495/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIED[SNSF] Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://dx.doi.org/10.13039/501100001711
PCEFP2194576[SNSF] Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://dx.doi.org/10.13039/501100001711
Research FellowshipEuropean Space Agencyhttp://dx.doi.org/10.13039/501100000844
1201371[FONDECYT] Fondo Nacional de Desarrollo Científico y Tecnológicohttp://dx.doi.org/10.13039/501100002850
FB210003Agencia Nacional de Investigación y Desarrollohttps://www.anid.cl/
Winton Exoplanet FellowshipDavid and Claudia Harding FoundationUNSPECIFIED

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