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We examine Kepler light curve variability on habitable zone transittimescales for a large uniform sample of spectroscopically studied Keplerexoplanet host stars. The stars, taken from Everett et al. (2013) aresolar-like in their properties and each harbors at least one exoplanet (orcandidate) of radius $\le$2.5\re. The variability timescale examined is typicalfor habitable zone planets orbiting solar-like stars and we note that thediscovery of the smallest exoplanets ($\le$1.2\re) with corresponding transitdepths of less than $\sim$0.18 mmag, occur for the brightest, photometricallyquietest stars. Thus, these detections are quite rare in $Kepler$ observations.Some brighter and more evolved stars (subgiants), the latter which often showlarge radial velocity jitter, are found to be among the photometricallyquietest solar-like stars in our sample and the most likely small planettransit hunting grounds. The Sun is discussed as a solar-like star proxy toprovide insights into the nature and cause of photometric variability. It isshown that $Kepler's$ broad, visible light observations are insensitive tovariability caused by chromospheric activity that may be present in theobserved stars.

Variability of Kepler Solar-Like Stars Harboring Small Exoplanets