KELT-15b: a new Hot Jupiter

KELT-14b and KELT-15b: An Independent Discovery of WASP-122b and a New Hot Jupiter

Authors:

Rodriguez et al

Abstract:

We report the discovery of KELT-14b and KELT-15b, two hot Jupiters from the KELT-South survey. KELT-14b, an independent discovery of the recently announced WASP-122b, is an inflated Jupiter mass planet that orbits a ∼5.0+0.3−0.7 Gyr, V = 11.0, G2 star that is near the main sequence turnoff. The host star, KELT-14 (TYC 7638-981-1), has an inferred mass M∗=1.18+0.05−0.07 M⊙ and radius R∗=1.37±−0.08 R⊙, and has Teff=5802+95−92 K, logg = 4.23+0.05−0.04 and [Fe/H] = 0.33±−0.09. The planet orbits with a period of 1.7100588±0.0000025 days (T0=2457091.02863±0.00047) and has a radius RP=1.52+0.12−0.11 RJ and mass MP = 1.196±0.072 MJ, and the eccentricity is consistent with zero. KELT-15b is another inflated Jupiter mass planet that orbits a ∼ 4.6+0.5−0.4 Gyr, V = 11.2, G0 star (TYC 8146-86-1) that is near the "blue hook" stage of evolution prior to the Hertzsprung gap, and has an inferred mass M∗=1.181+0.051−0.050 M⊙ and radius R∗=1.48+0.09−0.04 R⊙, and Teff=6003+56−52 K, logg=4.17+0.02−0.04 and [Fe/H]=0.05±0.03. The planet orbits on a period of 3.329441±0.000016 days (T0 = 2457029.1663±0.0073) and has a radius RP=1.443+0.11−0.057 RJ and mass MP=0.91+0.21−0.22 MJ and an eccentricity consistent with zero. KELT-14b has the second largest expected emission signal in the K-band for known transiting planets brighter than K less than 10.5. Both KELT-14b and KELT-15b are predicted to have large enough emission signals that their secondary eclipses should be detectable using ground-based observatories.