Gill, S, Bayliss, D, Cooke, BF, Wheatley, PJ, Nielsen, LD, Lendl, M, McCormac, J, Bryant, EM, Acton, JS, Anderson, DR, Belardi, C, Bouchy, F, Burleigh, MR, Cameron, AC, Casewell, SL, Chaushev, A, Goad, MR, Günther, MN, Hellier, C, Jackman, JAG, Jenkins, JS, Moyano, M, Pollacco, D, Raynard, L, Smith, AMS, Tilbrook, RH, Turner, O, Udry, S and West, RG (2019) NGTS and WASP photometric recovery of a single-transit candidate from TESS. Monthly Notices of the Royal Astronomical Society, 491 (2). 1548 - 1553. ISSN 0035-8711

[thumbnail of stz3212.pdf]
stz3212.pdf - Published Version
Available under License Creative Commons Attribution Non-commercial.

Download (1MB) | Preview


The Transiting Exoplanet Survey Satellite (TESS) produces a large number of single-transit event candidates, since the mission monitors most stars for only ∼27 d. 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 h 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 characterized stars in this mass regime. We find that its radius is 2.3σ lower than expected from stellar evolution models.

Item Type: Article
Additional Information: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Any extra information can be found at;
Uncontrolled Keywords: NGTS, WASP, photometric, single-transit, TESS.
Subjects: Q Science > Q Science (General)
Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB600 Planets. Planetology
Q Science > QB Astronomy > QB799 Stars
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 11 Mar 2020 09:13
Last Modified: 03 Mar 2021 10:05

Actions (login required)

View Item
View Item