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

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 (T₀ = 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 (T₀ = 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.