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24 April 2024

» arxiv » 1910.5050

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TOI-222: a single-transit TESS candidate revealed to be a 34-day eclipsing binary with CORALIE, EulerCam and NGTS
Monika Lendl ; 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 ; Sarah L. Casewell ; Benjamin F. Cooke ; Philipp Eigmüller ; Edward Gillen ; Michael R. Goad ; Maximilian N. Günther ; Janis Hagelberg ; James S. Jenkins ; Tom Louden ; Maxime Marmier ; James McCormac ; Maximiliano Moyano ; Don Pollacco ; Liam Raynard ; Rosanna H. Tilbrook ; Stéphane Udry ; Jose I. Vines ; Richard G. West ; Peter J. Wheatley ; George Ricker ; Roland Vanderspek ; David W. Latham ; Sara Seager ; Josh Winn ; Jon M. Jenkins ; Brett Addison ; César Briceño ; Rafael Brahm ; Douglas A. Caldwell ; John Doty ; Néstor Espinoza ; Bob Goeke ; Thomas Henning ; Andrés Jordán ; Akshata Krishnamurthy ; Nicholas Law ; Robert Morris ; Jack Okumura ; Andrew W. Mann ; Joseph E. Rodriguez ; Paula Sarkis ; Joshua Schlieder ; Joseph D. Twicken ; Steven Villanueva Jr. ; Robert A. Wittenmyer ; Duncan J. Wright ; Carl Ziegler ;
Date:	11 Oct 2019
Abstract:	We report the period, eccentricity, and mass determination for the TESS single-transit event candidate TOI-222, which displayed a single 3000 ppm transit in the TESS two-minute cadence data from Sector 2. We determine the orbital period via radial velocity measurements (P = 33.9 days), which allowed for ground-based photometric detection of two subsequent transits. Our data show that the companion to TOI-222is a low mass star, with a radius of 0.27 R_sun and a mass of 0.23 M_sun. This makes TOI-222 one of the longest period low-mass eclipsing binary systems to be characterised with accurate radii and masses. It also showcases the ability to efficiently discover systems from TESS single transit events using a combination of radial velocity monitoring coupled with high precision ground-based photometry.
Source:	arXiv, 1910.5050
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