K2-114b and K2-115b: Two Transiting Warm Jupiters

Abstract

We report the first results from a search for transiting warm Jupiter exoplanets - gas giant planets receiving stellar irradiation below about $10^8$ erg s${}^{-1}$ cm${}^{-2}$, equivalent to orbital periods beyond about 10 days around Sun-like stars. We have discovered two transiting warm Jupiter exoplanets initially identified as transiting candidates in $K2$ photometry. K2-114b has a mass of $1.85_{-0.22}^{+0.23}{M}_J$, a radius of $0.942_{-0.020}^{+0.032}{R}_J$, and an orbital period of 11.4 days. K2-115b has a mass of $0.84_{-0.20}^{+0.18}{M}_J$, a radius of $1.115_{-0.061}^{+0.057}{R}_J$, and an orbital period of 20.3 days. Both planets are among the longest period transiting gas giant planets with a measured mass, and they are orbiting relatively old host stars. Both planets are not inflated as their radii are consistent with theoretical expectations. Their position in the planet radius - stellar irradiation diagram is consistent with the scenario where the radius - irradiation correlation levels off below about 10${}^8$ erg s${}^{-1}$ cm${}^{-2}$, suggesting that for warm Jupiters the stellar irradiation does not play a significant role in determining the planet radius. We also report our identification of another $K2$ transiting warm Jupiter candidate, EPIC 212504617, as a false positive.

arXiv commentAccepted to AJ

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