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High resolution imaging is an important tool for follow-up study of exoplanetcandidates found via transit detection with the Kepler Mission. We discuss hereHST imaging with the WFC3 of 23 stars that host particularly interesting Keplerplanet candidates based on their small size and cool equilibrium temperatureestimates. Results include detections, exclusion of background stars that couldbe a source of false positives for the transits, and detection ofphysically-associated companions in a number of cases providing dilutionmeasures necessary for planet parameter refinement. For six KOIs, we find thatthere is ambiguity in which star hosts the transiting planet(s), withpotentially strong implications for planetary characteristics. Our sample isevenly distributed in G, K, and M spectral types. Albeit with a small samplesize, we find that physically-associated binaries are more common than expectedat each spectral type, reaching a factor of 10 frequency excess at M. Wedocument the program detection sensitivities, detections, and deliverables tothe Kepler follow-up program archive.

Hubble Space Telescope High Resolution Imaging of Kepler Small and Cool Exoplanet Host Stars