TOI-222: a single-transit TESS candidate revealed to be a 34-d eclipsing binary with CORALIE, EulerCam, and NGTS

Lendl, Monika and Bouchy, Francois and Gill, Samuel and Nielsen, Louise D. and Turner, Oliver and Stassun, Keivan and Acton, Jack S. and Anderson, David R. and Armstrong, David J. and Bayliss, Daniel and Belardi, Claudia and Bryant, Edward M. and Burleigh, Matthew R. and Chaushev, Alexander and Casewell, Sarah L. and Cooke, Benjamin F. and Eigmuller, Philipp and Gillen, Edward and Goad, Michael R. and Gunther, Maximilian N. and Hagelberg, Janis and Jenkins, James S. and Louden, Tom and Marmier, Maxime and McCormac, James and Moyano, Maximiliano and Pollacco, Don and Raynard, Liam and Tilbrook, Rosanna H. and Udry, Stephane and Vines, Jose I. and West, Richard G. and Wheatley, Peter J. and Ricker, George and Vanderspek, Roland and Latham, David W. and Seager, Sara and Winn, Josh and Jenkins, Jon M. and Addison, Brett ORCID: https://orcid.org/0000-0003-3216-0626 and Briceno, Cesar and Brahm, Rafael and Caldwell, Douglas A. and Doty, John and Espinoza, Nestor and Goeke, Bob and Henning, Thomas and Jordan, Andres and Krishnamurthy, Akshata and Law, Nicholas and Morris, Robert and Okumura, Jack and Mann, Andrew W. and Rodriguez, Joseph E. and Sarkis, Paula and Schlieder, Joshua and Twicken, Joseph D. and Villanueva Jr., Steven and Wittenmyer, Robert A. and Wright, Duncan J. and Ziegler, Carl (2019) TOI-222: a single-transit TESS candidate revealed to be a 34-d eclipsing binary with CORALIE, EulerCam, and NGTS. Monthly Notices of the Royal Astronomical Society, 492 (2). pp. 1761-1769. ISSN 0035-8711

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. Published by Oxford University Press on behalf of the Royal Astronomical Society. C 2019 The Author(s).
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 14 Jul 2020 02:10
Last Modified: 29 Jul 2020 04:34
Uncontrolled Keywords: techniques: photometric; stars: individual: TOI-222; planetary systems; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1093/mnras/stz3545
URI: http://eprints.usq.edu.au/id/eprint/38472

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