A long-period (P = 61.8 d) M5V dwarf eclipsing a Sun-like star from TESS and NGTS. Issue 3 (13th May 2020)

• Record Type: Journal Article
• Authors: Gill, Samuel; Cooke, Benjamin F; Bayliss, Daniel; Nielsen, Louise D; Lendl, Monika; Wheatley, Peter J; Anderson, David R; Moyano, Maximiliano; Bryant, Edward M; Acton, Jack S; Belardi, Claudia; Bouchy, François; Burleigh, Matthew R; Casewell, Sarah L; Chaushev, Alexander; Goad, Michael R; Jackman, James A G; Jenkins, James S; McCormac, James; Günther, Maximilian N; Osborn, Hugh P; Pollacco, Don; Raynard, Liam; Smith, Alexis M S; Tilbrook, Rosanna H; Turner, Oliver; Udry, Stéphane; Vines, Jose I; Watson, Christopher A; West, Richard G
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 495:Issue 3(2020)
• Page Start: 2713
• Page End: 2719
• Publication Date: 2020-05-13
• Subjects: binaries: eclipsing; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa1248
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: The Transiting Exoplanet Survey Satellite 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 ( T mag = 12.06 and $T_{\rm eff} = 5500 \pm 85\, \mathrm{ K}$ ) with NGTS and a third epoch with Las Cumbres Observatory's telescope in South Africa to constrain the orbital period ($P = 61.777\, \mathrm{ d}$ ). Subsequent radial velocity measurements with CORALIE revealed the transiting object has a mass of M 2 = 0.128 ± 0.003 M⊙, indicating the system is a G-M binary. The radius of the secondary is R 2 = 0.154 ± 0.008 R⊙ and is consistent with mesa models of stellar evolution to better than 1σ.