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We report the discovery of HAT-P-56b by the HATNet survey, an inflated hotJupiter transiting a bright F type star in Field 0 of NASA's K2 mission. Wecombine ground-based discovery and follow-up light curves with high precisionphotometry from K2, as well as ground-based radial velocities from TRES on theFLWO 1.5m telescope to determine the physical properties of this system.HAT-P-56b has a mass of $2.18 M_J$, radius of $1.47 R_J$, and transits its hoststar on a near-grazing orbit with a period of 2.7908 d. The radius of HAT-P-56bis among the largest known for a planet with $M_p > 2 M_J$. The host star has aV-band magnitude of 10.9, mass of 1.30 $M_\odot$, and radius of 1.43 $R_\odot$.The periodogram of the K2 light curve suggests the star is a $\gamma$ Dorvariable. HAT-P-56b is an example of a ground-based discovery of a transitingplanet, where space-based observations greatly improve the confidence in theconfirmation of its planetary nature, and also improve the accuracy of theplanetary parameters.

HAT-P-56b: An inflated massive Hot Jupiter transiting a bright F star followed up with K2 Campaign 0 observations