NGTS-10b: the shortest period hot Jupiter yet discovered
J. McCormac, Edward Gillen, James A. G. Jackman, D. J. A. Brown, Daniel Bayliss, P. J. Wheatley, D. R. Anderson, D. J. Armstrong, F. Bouchy, Joshua T Briegal, M. R. Burleigh, Juan Cabrera, S. L. Casewell, Alexander Chaushev, Bruno Chazelas, P. Chote, Benjamin F Cooke, Jean C Costes, Szilárd Csizmadia, Philipp Eigmüller, A. Erikson, Emma Foxell, B. T. Gänsicke, M. R. Goad, Maximilian N. Günther, S. T. Hodgkin, M. J. Hooton, J. S. Jenkins, Gregory Lambert, M. Lendl, Emma Longstaff, Tom Louden, Maximiliano Moyano, Louise D. Nielsen, D. Pollacco, D. Queloz, H. Rauer, Liam Raynard, A. M. S. Smith, B. Smalley, M. G. Soto, Oliver Turner, S. Udry, José I Vines, S. R. Walker, C. A. Watson, R. G. West
Abstract
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 $Q^{\prime }_{\rm s}$ =2 × 107.