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

2019; Oxford University Press; Volume: 492; Issue: 2 Linguagem: Inglês

10.1093/mnras/stz3545

1365-2966

M. Lendl, F. Bouchy, Samuel Gill, Louise D. Nielsen, Oliver Turner, Keivan G. Stassun, Jack S Acton, D. R. Anderson, D. J. Armstrong, D. Bayliss, Claudia Belardi, Edward M. Bryant, M. R. Burleigh, Alexander Chaushev, S. L. Casewell, Benjamin F Cooke, Philipp Eigmüller, Edward Gillen, M. R. Goad, Maximilian N. Günther, J. Hagelberg, J. S. Jenkins, Tom Louden, M. Marmier, J. McCormac, Maximiliano Moyano, D. Pollacco, Liam Raynard, Rosanna H Tilbrook, S. Udry, José I Vines, R. G. West, P. J. Wheatley, G. Ricker, R. Vanderspek, David W. Latham, Sara Seager, Josh Winn, Jon M. Jenkins, Brett C. Addison, César Briceño, Rafael Brahm, Douglas A. Caldwell, J. Doty, Néstor Espinoza, B. Goeke, Thomas Henning, Andrés Jordán, Akshata Krishnamurthy, Nicholas M. Law, Robert Morris, Jack Okumura, Andrew W. Mann, Joseph E. Rodriguez, P. Sarkis, Joshua E. Schlieder, Joseph D. Twicken, Steven Villanueva, Robert A. Wittenmyer, D. J. Wright, Carl Ziegler,

Astrophysics and Star Formation Studies

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.