HR diagram of the sample presented in this work. The sources are color-coded following the same color-coding as in Fig. 1. The isochrones (black dashed lines, shown for 0.5, 2, 10, and 300 Myr) and the lines of constant mass (dark blue dotted lines, shown for 0.04, 0.07, 0.1, and 0.2 M_⊙) shown are from Baraffe et al. (2015). Source CFHTWIR-Oph 77 is shown with a square to highlight its possible subluminous nature.