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All transiting planet observations are at risk of contamination from nearby,unresolved stars. Blends dilute the transit signal, causing the planet toappear smaller than it really is, or produce a false positive detection whenthe target star is blended with an eclipsing binary. High spatial resolutionadaptive optics images are the best way of resolving undetected contaminants.Here we present companions and detection limits for 12 Kepler candidates, ofwhich 4 have companions within 4 arcsec. One system (KOI 1537) consists of twosimilar-magnitude stars separated by 0.1 arcsec, while KOI 174 has a companionat 0.5 arcsec. In addition, observations were made of 15 transiting planetsthat were previously discovered by other surveys. The only companion foundwithin 1 arcsec of a known planet is the previously identified companion toWASP-2b. An additional four systems have companions between 1-4 arcsec:HAT-P-30b (3.7 arcsec, Delta Ks = 2.9), HAT-P-32b (2.9 arcsec, Delta Ks = 3.4),TrES-1b (2.3 arcsec, Delta Ks = 7.7), and WASP-P-33b (1.9 arcsec, Delta Ks =5.5), some of which have not been reported previously. Depending on the spatialresolution of the transit photometry for these systems, these companion starsmay require a reassessment of the planetary parameters derived from transitlight curves. For all systems observed, we report the limiting magnitudes ofadditional objects located 0.1-4 arcsec from the target.

Adaptive Optics Images II: 12 Kepler Objects of Interest and 15 Confirmed Transiting Planets