Evolutionary tracks from the model of Baraffe et al. (2003) showing the temporal evolution of (top) the luminosity and (bottom) the effective temperature (T_eff) for cool brown dwarfs and giant exoplanets. Each curve corresponds to a specific mass (in M_⊙), as labelled at the end of the tracks. The red data point represents the companion V2376 Ori b, plotted with its age and luminosity (top panel), and its effective temperature (bottom panel), with associated uncertainties, using the black body model fitted to the SED.