Published in
Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 2(492), p. 1761-1769, 2019
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TOI-222: a single-transit TESS candidate revealed to be a 34-d eclipsing binary with CORALIE, EulerCam, and NGTS
,
François Bouchy,
Samuel Gill,
Louise D. Nielsen ,
Oliver Turner,
Keivan Stassun ,
Jack S. Acton,
David R. Anderson ,
David J. Armstrong ,
Daniel Bayliss ,
Claudia Belardi,
Edward M. Bryant,
Matthew R. Burleigh,
Alexander Chaushev,
Sarah L. Casewell
and other authors.
Full text: Unavailable
Abstract
ABSTRACT We report the period, eccentricity, and mass determination for the Transiting Exoplanet Survey Satellite (TESS) single-transit event candidate TOI-222, which displayed a single 3000 ppm transit in the TESS 2-min cadence data from Sector 2. We determine the orbital period via radial velocity measurements (P = 33.9 d), which allowed for ground-based photometric detection of two subsequent transits. Our data show that the companion to TOI-222 is a low-mass star, with a radius of $0.18_{-0.10}^{+0.39}$ R⊙ and a mass of 0.23 ± 0.01 M⊙. This discovery showcases the ability to efficiently discover long-period systems from TESS single-transit events using a combination of radial velocity monitoring coupled with high-precision ground-based photometry.
