We report deep imaging observations of the young , nearby star AB Pic , a member of the large Tucana-Horologium association .
We have detected a faint , red source 5.5 ~ { } " South of the star with JHK colors compatible with that of a young substellar L dwarf .
Follow-up observations at two additional epochs confirm , with a confidence level of 4.7 \sigma , that the faint red object is a companion to AB Pic rather than it being a stationary background object .
A low resolution K-band spectrum indicates an early-L spectral type for the companion .
Finally , evolutionary model predictions based on the JHK photometry of AB Pic b indicate a mass of 13 to 14 MJup if its age is \sim 30 Myr .
Is AB Pic b a massive planet or a minimum mass brown dwarf ?