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NGTS clusters survey - III. A low-mass eclipsing binary in the Blanco 1 open cluster spanning the fully convective boundary

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posted on 2021-12-17, 16:12 authored by Gareth D Smith, Edward Gillen, Didier Queloz, Lynne A Hillenbrand, Jack S Acton, Douglas R Alves, David R Anderson, Daniel Bayliss, Joshua T Briegal, Matthew R Burleigh, Sarah L Casewell, Laetitia Delrez, Georgina Dransfield, Elsa Ducrot, Samuel Gill, Michael Gillon, Michael R Goad, Maximilian N Gunther, Beth A Henderson, James S Jenkins, Emmanuel Jehin, Maximiliano Moyano, Catriona A Murray, Peter P Pedersen, Daniel Sebastian, Samantha Thompson, Rosanna H Tilbrook, Amaury HMJ Triaud, Jose Vines, Peter J Wheatley
We present the discovery and characterization of an eclipsing binary identified by the Next Generation Transit Survey in the ∼115-Myr-old Blanco 1 open cluster. NGTS J0002-29 comprises three M dwarfs: a short-period binary and a companion in a wider orbit. This system is the first well-characterized, low-mass eclipsing binary in Blanco 1. With a low mass ratio, a tertiary companion, and binary components that straddle the fully convective boundary, it is an important benchmark system, and one of only two well-characterized, low-mass eclipsing binaries at this age. We simultaneously model light curves from NGTS, TESS, SPECULOOS, and SAAO, radial velocities from VLT/UVES and Keck/HIRES, and the system’s spectral energy distribution. We find that the binary components travel on circular orbits around their common centre of mass in Porb = 1.098 005 24 ± 0.000 000 38 d, and have masses Mpri = 0.3978 ± 0.0033 M☉ and Msec = 0.2245 ± 0.0018 M☉, radii Rpri = 0.4037 ± 0.0048 R☉ and Rsec = 0.2759 ± 0.0055 R☉, and effective temperatures Tpri = 3372+44-37 K and Tsec = 3231+38-31 K. We compare these properties to the predictions of seven stellar evolution models, which typically imply an inflated primary. The system joins a list of 19 well-characterized, low-mass, sub-Gyr, stellar-mass eclipsing binaries, which constitute some of the strongest observational tests of stellar evolution theory at low masses and young ages.

History

Citation

Monthly Notices of the Royal Astronomical Society, Volume 507, Issue 4, November 2021, Pages 5991–6011, https://doi.org/10.1093/mnras/stab2374

Author affiliation

Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Volume

507

Issue

4

Pagination

5991 - 6011

Publisher

Oxford University Press (OUP) for Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Acceptance date

2021-08-13

Copyright date

2021

Available date

2021-12-17

Language

English