NGTS and WASP photometric recovery of a single-transit candidate from TESS

Samuel Gill, Daniel Bayliss, Benjamin F. Cooke, Peter J. Wheatley, Louise D. Nielsen, Monika Lendl, James McCormac, Edward M. Bryant, Jack S. Acton, David R. Anderson, Claudia Belardi, François Bouchy, Matthew R. Burleigh, Andrew Collier Cameron, Sarah L. Casewell, Alexander Chaushev, Michael R. Goad, Maximilian N. Günther, Coel Hellier, James A. G. JackmanJames S. Jenkins, Maximiliano Moyano, Don Pollacco, Liam Raynard, Alexis M. S. Smith, Rosanna H. Tilbrook, Oliver Turner, Stéphane Udry, Richard G. West

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The Transiting Exoplanet Survey Satellite (TESS) produces a large numberof single-transit event candidates, since the mission monitors most stars for only ˜27 days. Such candidates correspond to long-period planets or eclipsing binaries. Using the TESS Sector 1 full-frame images, we identified a 7750 ppm single-transit event with a duration of 7 hours around the moderately evolved F-dwarf star TIC-238855958 (Tmag=10.23, Teff=6280±85 K). Using archival WASP photometry we constrained the true orbital period to one of three possible values. We detected a subsequent transit-event with NGTS, which revealed the orbital period to be 38.20 d. Radial velocity measurements from the CORALIE Spectrograph show the secondary object has a mass of M2= 0.148 ± 0.003 M⊙, indicating this system is an F-M eclipsing binary. The radius of the M-dwarf companion is R2 = 0.171 ± 0.003 R⊙, making this one of the most well characterised stars in this mass regime. We find that its radius is 2.3-σ lower than expected from stellar evolution models.
Original languageEnglish
Pages (from-to)1548–1553
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Early online date19 Nov 2019
Publication statusPublished - Jan 2020


  • Binaries: eclipsing


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