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The properties of a transiting planet's host star are written in its transitlight curve. The light curve can reveal the stellar density and the limbdarkening profile in addition to the characteristics of the planet and itsorbit. For planets with strong prior constraints on orbital eccentricity, wemay measure these stellar properties directly from the light curve; this methodpromises to aid greatly in the characterization of transiting planet host starstargeted by the upcoming NASA TESS mission and any long-period,singly-transiting planets discovered in the same systems. Using Bayesianinference, we fit a transit model, including a nonlinear limb darkening law, to66 Kepler transiting planet hosts to measure their stellar properties. Wepresent posterior distributions of stellar density, limb-darkeningcoefficients, and other system parameters for these stars. We measure densitiesto within 5% for the majority of our target stars, with the dominantprecision-limiting factor being the signal-to-noise ratio of the transits. 95 %of our measured stellar densities are in 3-sigma or better agreement withpreviously published literature values. We make posterior distributions for allof our target KOIs available for online download.

Know the Planet, Know the Star: Precise Stellar Densities from Kepler Transit Light Curves