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

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journal contribution
posted on 2020-04-23, 14:22 authored by Monika Lendl, Francois 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, Benjamin F Cooke, Philipp Eigmueller, Edward Gillen, Michael R Goad, Maximilian N Gunther, Janis Hagelberg, James S Jenkins, Tom Louden, Maxime Marmier, James McCormac, Maximiliano Moyano, Don Pollacco, Liam Raynard, Rosanna H Tilbrook, Stephane Udry, Jose Vines, Richard G West, Peter J Wheatley, George Ricker, Roland Vanderspek, David W Latham, Sara Seager, Josh Winn, Jon M Jenkins, Brett Addison, Cesar Briceno, Rafael Brahm, Douglas A Caldwell, John Doty, Nestor Espinoza, Bob Goeke, Thomas Henning, Andres Jordan, Akshata Krishnamurthy, Nicholas Law, Robert Morris, Jack Okumura, Andrew W Mann, Joseph E Rodriguez, Paula Sarkis, Joshua Schlieder, Joseph D Twicken, Steven Villanueva, Robert A Wittenmyer, Duncan J Wright, Carl Ziegler
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+−003910 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.

History

Citation

Monthly Notices of the Royal Astronomical Society, Volume 492, Issue 2, February 2020, Pages 1761–1769, https://doi.org/10.1093/mnras/stz3545

Version

  • VoR (Version of Record)

Published in

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

Volume

492

Issue

2

Pagination

1761 - 1769 (9)

Publisher

OXFORD UNIV PRESS

issn

0035-8711

eissn

1365-2966

Acceptance date

2019-12-13

Copyright date

2019

Available date

2019-12-23

Publisher version

https://academic.oup.com/mnras/article-abstract/492/2/1761/5685968

Notes

Accepted for publication in MNRAS

Language

English