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arXiv · 1910.05050

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·Alexander Chaushev·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
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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-222 is a low mass star, with a radius of $0.18_{-0.10}^{+0.39}$ Rsun and a mass of $0.23\pm0.01$ Msun. 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.

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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, Alexander Chaushev, 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. 2019-10-11. TOI-222: a single-transit TESS candidate revealed to be a 34-day eclipsing binary with CORALIE, EulerCam and NGTS. https://doi.org/10.1093/mnras/stz3545

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