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We report the confirmation and characterization of a transiting gas giantplanet orbiting the M dwarf KOI-254 every 2.455239 days, which was originallydiscovered by the Kepler mission. We use radial velocity measurements, adaptiveoptics imaging and near infrared spectroscopy to confirm the planetary natureof the transit events. KOI-254b is the first hot Jupiter discovered around anM-type dwarf star. We also present a new model-independent method of usingbroadband photometry to estimate the mass and metallicity of an M dwarf withoutrelying on a direct distance measurement. Included in this methodology is a newphotometric metallicity calibration based on J-K colors. We use this techniqueto measure the physical properties of KOI-254 and its planet. We measure aplanet mass of Mp = 0.505 Mjup, radius Rp = 0.96 Rjup and semimajor axis a =0.03 AU, based on our measured stellar mass Mstar = 0.59 Msun and radius Rstar= 0.55 Rsun. We also find that the host star is metal-rich, which is consistentwith the sample of M-type stars known to harbor giant planets.

Characterizing the Cool KOIs II. The M Dwarf KOI-254 and its Hot Jupiter