Poster Open Access

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

Smith, Gareth; Gillen, Edward; Queloz, Didier; Hodgkin, Simon

Editor(s)
Wolk, Scott

We present the discovery and characterisation of a P  ~ 1.1 day, low-mass eclipsing binary (EB) found by the Next Generation Transit Survey in the ~115 Myr old Blanco 1 open cluster. The system is the first well-characterised EB in Blanco 1; it has a low-mass tertiary companion, a low mass ratio, and components that straddle the fully convective boundary. 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 compare the system properties to the predictions of seven stellar evolution models. This new EB joins a list of 20 well-characterised, low-mass, sub-Gyr EBs which constitute some of the strongest observational tests of stellar evolution theory at low masses and young ages.

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Publication date:
February 26, 2021
DOI:
10.5281/zenodo.4564199

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10.5281/zenodo.4564199

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Keyword(s):
Stellar systems, clusters, and associations Eclipsing binary Stellar evolution
Meeting:
The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun (CS20.5), 2-4 March 2021
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License (for files):
Creative Commons Attribution 4.0 International

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