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Young, nearby stars are ideal targets to search for planets using the directimaging technique. The determination of stellar parameters is crucial for theinterpretation of imaging survey results particularly since the luminosity ofsubstellar objects has a strong dependence on system age. We have conducted alarge program with NaCo at the VLT in order to search for planets and browndwarfs in wide orbits around 86 stars. A large fraction of the targets observedwith NaCo were poorly investigated in the literature. We performed a study tocharacterize the fundamental properties (age, distance, mass) of the stars inour sample. To improve target age determinations, we compiled and analyzed acomplete set of age diagnostics. We measured spectroscopic parameters and agediagnostics using dedicated observations acquired with FEROS and CORALIEspectrographs at La Silla Observatory. We also made extensive use of archivalspectroscopic data and results available in the literature. Additionally, weexploited photometric time-series, available in ASAS and Super-WASP archives,to derive rotation period for a large fraction of our program stars. Weprovided updated characterization of all the targets observed in the VLT NaCoLarge program, a survey designed to probe the occurrence of exoplanets andbrown dwarfs in wide orbits. The median distance and age of our program starsare 64 pc and 100 Myr, respectively. Nearly all the stars have masses between0.70 and 1.50sun, with a median value of 1.01 Msun. The typical metallicity isclose to solar, with a dispersion that is smaller than that of samples usuallyobserved in radial velocity surveys. Several stars are confirmed or proposedhere to be members of nearby young moving groups. Eight spectroscopic binariesare identified.

The VLT/NaCo Large program to probe the occurrence of exoplanets and brown dwarfs in wide orbits: I- Sample definition and characterization