NGTS and WASP photometric recovery of a single-transit candidate from TESS
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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.
Gill , S , Bayliss , D , Cooke , B F , Wheatley , P J , Nielsen , L D , Lendl , M , McCormac , J , Bryant , E M , Acton , J S , Anderson , D R , Belardi , C , Bouchy , F , Burleigh , M R , Collier Cameron , A , Casewell , S L , Chaushev , A , Goad , M R , Günther , M N , Hellier , C , Jackman , J A G , Jenkins , J S , Moyano , M , Pollacco , D , Raynard , L , Smith , A M S , Tilbrook , R H , Turner , O , Udry , S & West , R G 2020 , ' NGTS and WASP photometric recovery of a single-transit candidate from TESS ' , Monthly Notices of the Royal Astronomical Society , vol. 491 , no. 2 , pp. 1548–1553 . https://doi.org/10.1093/mnras/stz3212
Monthly Notices of the Royal Astronomical Society
Copyright © 2019 the Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stz3212
DescriptionFunding:UK Science and Technology Facilities Council (STFC) consolidated grant number ST/R000824/1 (ACC).
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