NGTS-10b: The shortest period hot Jupiter yet discovered

James McCormac, Edward Gillen, James A. G. Jackman, David J. A. Brown, Daniel Bayliss, Peter J. Wheatley, Richard G. West, David R. Anderson, David J. Armstrong, Francois Bouchy, Joshua T. Briegal, Matthew R. Burleigh, Juan Cabrera, Sarah L. Casewell, Alexander Chaushev, Bruno Chazelas, Paul Chote, Benjamin F. Cooke, Jean C. Costes, Szilard CsizmadiaPhilipp Eigmuller, Anders Erikson, Emma Foxell, Boris T. Gaensicke, Michael R. Goad, Maximilian N. Gunther, Simon T. Hodgkin, Matthew J. Hooton, James S. Jenkins, Gregory Lambert, Monika Lendl, Emma Longstaff, Tom Louden, Maximiliano Moyano, Louise D. Nielsen, Don Pollacco, Didier Queloz, Heike Rauer, Liam Raynard, Alexis M. S. Smith, Barry Smalley, Maritza Soto, Oliver Turner, Stephane Udry, Jose I. Vines, Simon. R. Walker, Christopher A. Watson

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We report the discovery of a new ultrashort period (USP) transiting hot Jupiter from the Next Generation Transit Survey (NGTS). NGTS-10b has a mass and radius of 2.162+0.092−0.107 MJ and 1.205+0.117−0.083 RJ and orbits its host star with a period of 0.7668944 ± 0.0000003 d, making it the shortest period hot Jupiter yet discovered. The host is a 10.4 ± 2.5 Gyr old K5V star (Teff = 4400 ± 100 K) of Solar metallicity ([Fe/H] = −0.02 ± 0.12 dex) showing moderate signs of stellar activity. NGTS-10b joins a short list of USP Jupiters that are prime candidates for the study of star–planet tidal interactions. NGTS-10b orbits its host at just 1.46 ± 0.18 Roche radii, and we calculate a median remaining inspiral time of 38 Myr and a potentially measurable orbital period decay of 7 s over the coming decade, assuming a stellar tidal quality factor Q′s =2 × 107.
Original languageEnglish
Pages (from-to)126-140
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date20 Feb 2020
Publication statusEarly online date - 20 Feb 2020


  • Astrophysics - Earth and Planetary Astrophysics


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