HR diagramme of the Lupus sample (black dots) with 2MASS J15491331 overplotted in green. The PMS evolutionary tracks of Baraffe et al. (2015) are overplotted with the dashed blue lines, while isochrones (1 Myr, 3 Myr, 30 Myr and 10 Gyr) are the red lines. Subluminous objects are overplotted with encircled dots (2MASS J15491331 in green). The green non-encircled dot is 2MASS J15491331 when luminosity is corrected by disc obscuration.