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We obtained high-resolution, high-contrast optical imaging in the SDSS $i'$band with the LuckyCam camera mounted on the 2.56m Nordic Optical Telescope, tosearch for faint stellar companions to 16 stars harbouring transitingexoplanets. The Lucky Imaging technique uses very short exposures to obtainnear diffraction-limited images yielding sub-arcsecond sensitivity, allowing usto search for faint stellar companions within the seeing disc of the primaryplanet host. Here we report the detection of two candidate stellar companionsto the planet host TrES-1 at separations $<6.5\arcsec$ and we confirm stellarcompanions to CoRoT-2, CoRoT-3, TrES-2, TrES-4, and HAT-P-7 already known inthe literature. We do not confirm the candidate companions to HAT-P-8 found viaLucky Imaging by \citet{Bergfors2013}, however, most probably because HAT-P-8was observed in poor seeing conditions. Our detection sensitivity limits allowus to place constraints on the spectral types and masses of the putative boundcompanions to the planet host stars in our sample. If bound, the stellarcompanions identified in this work would provide stringent observationalconstraints to models of planet formation and evolution. In addition thesecompanions could affect the derived physical properties of the exoplanets inthese systems.

Lucky Imaging of transiting planet host stars with LuckyCam