KELT-14b AND KELT-15b: AN INDEPENDENT DISCOVERY OF WASP-122b AND A NEW HOT JUPITER

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 − 0.7 + 0.3 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 − 0.07 + 0.05 M ⊙ and radius R * = 1.37 ± − 0.08 R ⊙ , and has T eff  = 5802 − 92 + 95 K, log g * = 4.23 − 0.04 + 0.05 and [ Fe / H ]  = 0.33 ± −0.09. The planet orbits with a period of 1.7100588 ± 0.0000025 days ( T 0  = 2457091.02863 ± 0.00047) and has a radius R p  = 1.52 − 0.11 + 0.12 R J and mass M p  = 1.196 ± 0.072  M J , and the eccentricity is consistent with zero. KELT-15b is another inflated Jupiter mass planet that orbits a ∼ 4.6 − 0.4 + 0.5 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 − 0.050 + 0.051 M ⊙ and radius R * = 1.48 − 0.04 + 0.09 R ⊙ , and T eff  = 6003 − 52 + 56 K, log g * = 4.17 − 0.04 + 0.02 and [ Fe / H ]  = 0.05 ± 0.03. The planet orbits on a period of 3.329441 ± 0.000016 days ( T 0 = 2457029.1663 ± 0.0073) and has a radius R p  = 1.443 − 0.057 + 0.11 R J and mass M p  = 0.91 − 0.22 + 0.21 M J 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  < 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.