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.
Highlights
To date over 4000 transiting exoplanets have been discovered,1 389 of which have been detected by ground-based surveys such as WASP (Pollacco et al 2006), HATNet (Bakos et al 2004), HATSouth (Bakos et al 2013), and KELT (Pepper et al 2007, 2012)
We find that Next Generation Transit Survey (NGTS)-10b has a mass and radius of Mp
For values of log Qs more consistent with those found for other hot Jupiters, we find that the planet reaches the Roche limit on time-scales of the order Myr to hundreds of Myr
Summary
To date over 4000 transiting exoplanets have been discovered, 389 of which have been detected by ground-based surveys such as WASP (Pollacco et al 2006), HATNet (Bakos et al 2004), HATSouth (Bakos et al 2013), and KELT (Pepper et al 2007, 2012). The majority (84 per cent) of the ground-based discoveries are hot Jupiters, planets with masses in the range 0.1 < Mp < 13 MJup and periods 10 d. Ultrashort period (USP) hot Jupiters, those with periods
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