Document Type

Article

Publication Date

5-11-2016

Published In

Astronomical Journal

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 $\sim {5.0}_{-0.7}^{+0.3}$ 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 ${R}_{*}$ = $1.37\pm -0.08$ R⊙, and has ${T}_{{\rm{eff}}}$ = ${5802}_{-92}^{+95}$ K, $\mathrm{log}{g}_{*}$ = ${4.23}_{-0.04}^{+0.05}$ and $[{\rm{Fe}}/{\rm{H}}]$ = 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 = ${1.52}_{-0.11}^{+0.12}$ 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 ~${4.6}_{-0.4}^{+0.5}$ 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 ${T}_{{\rm{eff}}}$ = ${6003}_{-52}^{+56}$ K, $\mathrm{log}{g}_{*}$ = ${4.17}_{-0.04}^{+0.02}$ and $[{\rm{Fe}}/{\rm{H}}]$ = 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 = ${1.443}_{-0.057}^{+0.11}$ RJ and mass Mp = ${0.91}_{-0.22}^{+0.21}$ 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 < 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.

Comments

This work is freely available courtesy of the American Astronomical Society and IOP Publishing.

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