The Transiting Exoplanet Survey Satellite (TESS) has produced a large number of single transit event candidates which are being monitored by the Next Generation Transit Survey (NGTS). We observed a second epoch for the TIC-231005575 system (Tmag = 12.06, Teff = 5500 +- 85 K) with NGTS and a third epoch with Las Cumbres Observatory's (LCO) telescope in South Africa to constrain the orbital period (P = 61.777 d). Subsequent radial velocity measurements with CORALIE revealed the transiting object has a mass of M2 = 0.128 +- 0.003 M⊙, indicating the system is a G-M binary. The radius of the secondary is R2 = 0.154 +- 0.008 R⊙ and is consistent with models of stellar evolution to better than 1-σ.
@article{arxiv.2002.09311,
title = {A long period (P = 61.8-d) M5V dwarf eclipsing a Sun-like star from TESS and NGTS},
author = {Samuel Gill and Benjamin F. Cooke and Daniel Bayliss and Louise D. Nielson and Monika Lendl and Peter J. Wheatley and David R. Anderson and Maximiliano Moyano and Edward M. Bryant and Jack S. Acton and Claudia Belardi and Francois Bouchy and Matthew R. Burleigh and Sarah L. Casewell and Alexander Chausev and Michael R. Goad and James A. G. Jackman and James S. Jenkins and James McCormac and Maximilian N. Gunther and Hugh P. Osborn and Don Pollaco and Liam Raynard and Alexis M. S. Smith and Rosanna H. Tillbrook and Oliver Turner and Stephane Udry and Jose I. Vines and Christopher A. Watson and Richard G. West},
journal= {arXiv preprint arXiv:2002.09311},
year = {2020}
}
Comments
8 pages, 5 figures, 3 tables. Accepted for publication in MNRAS