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We report the discovery of KELT-6b, a mildly-inflated Saturn-mass planettransiting a metal-poor host. The initial transit signal was identified inKELT-North survey data, and the planetary nature of the occulter wasestablished using a combination of follow-up photometry, high-resolutionimaging, high-resolution spectroscopy, and precise radial velocitymeasurements. The fiducial model from a global analysis including constraintsfrom isochrones indicates that the V=10.38 host star (BD+31 2447) is a mildlyevolved, late-F star with T_eff=6102 \pm 43 K, log(g_*)=4.07_{-0.07}^{+0.04}and [Fe/H]=-0.28 \pm 0.04, with an inferred mass M_*=1.09 \pm 0.04 M_sun andradius R_star=1.58_{-0.09}^{+0.16} R_sun. The planetary companion has massM_P=0.43 \pm 0.05 M_J, radius R_P=1.19_{-0.08}^{+0.13} R_J, surface gravitylog(g_P)=2.86_{-0.08}^{+0.06}, and density rho_P=0.31_{-0.08}^{+0.07}g~cm^{-3}. The planet is on an orbit with semimajor axis a=0.079 \pm 0.001 AUand eccentricity e=0.22_{-0.10}^{+0.12}, which is roughly consistent withcircular, and has ephemeris of T_c(BJD_TDB)=2456347.79679 \pm 0.00036 andP=7.845631 \pm 0.000046 d. Equally plausible fits that employ empiricalconstraints on the host star parameters rather than isochrones yield a largerplanet mass and radius by ~4-7%. KELT-6b has surface gravity and incident fluxsimilar to HD209458b, but orbits a host that is more metal poor than HD209458by ~0.3 dex. Thus, the KELT-6 system offers an opportunity to perform acomparative measurement of two similar planets in similar environments aroundstars of very different metallicities. The precise radial velocity data alsoreveal an acceleration indicative of a longer-period third body in the system,although the companion is not detected in Keck adaptive optics images.

KELT-6b: A P~7.9 d Hot Saturn Transiting a Metal-Poor Star with a Long-Period Companion