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In anticipation of the VLT/SPHERE planet imager guaranteed time programs, wehave conducted a preparatory survey of 86 stars between 2009 and 2013 in orderto identify new faint comoving companions to ultimately carry out acomprehensive analysis of the occurence of giant planets and brown dwarfcompanions at wide (10-2000 AU) orbits around young, solar-type stars. We usedNaCo at VLT to explore the occurrence rate of giant planets and brown dwarfsbetween typically 0.1 and 8''. Diffraction-limited observations in H-bandcombined with angular differential imaging enabled us to reach primarystar-companion brightness ratios as small as 10-6 at 1.5''. 12 systems wereresolved as new binaries, including the discovery of a new white dwarfcompanion to the star HD8049. Around 34 stars, at least one companion candidatewas detected in the observed field of view. More than 400 faint sources weredetected, 90% of them in 4 crowded fields. With the exception of HD8049B, wedid not identify any new comoving companions. The survey also led to spatiallyresolved images of the thin debris disk around HD\,61005 that have beenpublished earlier. Finally, considering the survey detection limits, we derivea preliminary upper limit on the frequency of giant planets for semi-major axesof [10,2000] AU: typically less than 15% between 100 and 500 AU, and less than10% between 50 and 500 AU for exoplanets more massive than 5 MJup and 10 MJuprespectively, considering a uniform input distribution and with a confidencelevel of 95%.

The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits: II- Survey description, results and performances