5σ detection limit around IM Lup, derived from the Ks-band 2008 data, assuming an age of  ≃ 1 Myr and the COND03 model from Baraffe et al. (2003). The dashed curves show the limits for distances of 140 and 190 pc, respectively. The dashed lines shows the level of contrast for two planet masses: 1, 2 M_Jup. The black circle and associated error bar shows the point-source Ks band absolute magnitude if associated.