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If it is commonly agreed that the presence of a (moderately) close stellarcompanion affects the formation and the dynamical evolution of giant planets,the frequency of giant planets residing in binary systems separated by lessthan 100 AU is unknown. To address this issue, we have conducted with VLT/NACOa systematic adaptive optics search for moderately close stellar companions to130 nearby solar-type stars. According to the data from Doppler surveys, halfof our targets host at least one planetary companion, while the other half showno evidence for short-period giant planets. We present here the final resultsof our survey, which include a new series of second-epoch measurements to testfor common proper motion. The new observations confirm the physical associationof two companion candidates and prove the unbound status of many others. Theseresults strengthen our former conclusion that circumstellar giant planets areslightly less frequent in binaries with mean semimajor axes between 35 and 100AU than in wider systems or around single stars.

Probing the impact of stellar duplicity on the frequency of giant planets: final results of our VLT/NACO survey