NGTS-10b: the shortest period hot Jupiter yet discovered
Smalley, Barry; Jackman, James A. G.; Wheatley, Peter J.; Bayliss, Daniel; Moyano, Maximiliano; Günther, Maximilian N.; Cabrera, Juan; Eigmüller, Philipp; Erikson, Anders; Rauer, Heike; Casewell, Sarah L.; Goad, Michael R.; Anderson, David R.; Armstrong, David J.; Burleigh, Matthew R.; Gillen, Edward; Jenkins, James S.; Lendl, Monika; McCormac, James; Udry, Stéphane; Vines, Jose I.; West, Richard G.; Smith, Alexis M. S.; Gänsicke, Boris T.; Queloz, Didier; Watson, Christopher A.; Chazelas, Bruno; Lambert, Gregory; Bouchy, François; Chaushev, Alexander; Chote, Paul; Csizmadia, Szilárd; Foxell, Emma; Hodgkin, Simon T.; Louden, Tom; Nielsen, Louise D.; Raynard, Liam; Soto, Maritza; Pollacco, Don; Briegal, Joshua T.; Brown, David J. A.; Turner, Oliver; Hooton, Matthew J.; Costes, Jean C.; Cooke, Benjamin F.; Longstaff, Emma; Walker, Simon R.
United Kingdom, Switzerland, Germany, United States, Chile, Austria
Abstract
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.