HR diagrams in H- (panel a) and K-band (panel b) showing stellar tracks for different masses according Baraffe et al. (2015) evolutionary models. Isochrones (red-dashed lines) range from 0.5 to 10 Myr. The evolutionary paths (blue lines) are considered for stellar masses ranging from 0.1 to 0.6 M_⊙, per steps of 0.1 M_⊙. The black and green error bars correspond to the best-fit T_eff and dereddened absolute magnitude of the companion in case all the observed H + K signal is photospheric (case I) or made of a combination of photosphere+hot environment (case II).