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The nearby M-dwarf AP Col was recently identified by Riedel et al. 2011 as apre-main sequence star (age 12 - 50 Myr) situated only 8.4 pc from the Sun. Thecombination of its youth, distance, and intrinsically low luminosity make it anideal target to search for extrasolar planets using direct imaging. We reportdeep adaptive optics observations of AP Col taken with VLT/NACO and Keck/NIRC2in the L-band. Using aggressive speckle suppression and background subtractiontechniques, we are able to rule out companions with mass m >= 0.5 - 1M_Jup forprojected separations a>4.5 AU, and m >= 2 M_Jup for projected separations assmall as 3 AU, assuming an age of 40 Myr using the COND theoreticalevolutionary models. Using a different set of models the mass limits increaseby a factor of ~2. The observations presented here are the deepestmass-sensitivity limits yet achieved within 20 AU on a star with directimaging. While Doppler radial velocity surveys have shown that Jovian bodieswith close-in orbits are rare around M-dwarfs, gravitational microlensingstudies predict that ~17% of these stars host massive planets with orbitalseparations of 1-10 AU. Sensitive high-contrast imaging observations, likethose presented here, will help to validate results from complementarydetection techniques by determining the frequency of gas giant planets on wideorbits around M-dwarfs.

Searching for young Jupiter analogs around AP Col: L-band high-contrast imaging of the closest pre-main sequence star