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We report the discovery of Kepler-15b, a new transiting exoplanet detected byNASA's Kepler mission. The transit signal with a period of 4.94 days wasdetected in the quarter 1 (Q1) Kepler photometry. For the first time, we haveused the High-Resolution-Spectrograph (HRS) at the Hobby-Eberly Telescope (HET)to determine the mass of a Kepler planet via precise radial velocity (RV)measurements. The 24 HET/HRS radial velocities (RV) and 6 additionalmeasurements from the FIES spectrograph at the Nordic Optical Telescope (NOT)reveal a Doppler signal with the same period and phase as the transitephemeris. We used one HET/HRS spectrum of Kepler-15 taken without the iodinecell to determine accurate stellar parameters. The host star is a metal-rich([Fe/H]=0.36+/-0.07) G-type main sequence star with T_eff=5515+/-124 K. Theamplitude of the RV-orbit yields a mass of the planet of 0.66+/-0.1 M_Jup. Theplanet has a radius of 0.96+/-0.06 R_Jup and a mean bulk density of 0.9+/-0.2g/cm^3. The planetary radius resides on the lower envelope for transitingplanets with similar mass and irradiation level. This suggests significantenrichment of the planet with heavy elements. We estimate a heavy element massof 30-40 M_Earth within Kepler-15b.

The First Kepler Mission Planet Confirmed With The Hobby-Eberly Telescope: Kepler-15b, a Hot Jupiter Enriched In Heavy Elements