J-band absolute magnitude versus color I−J diagram for the accreting M5.5 dwarf (DENIS1538−1038) and the nonaccreting M3.5 one (DENIS1538−1039). Isochrones and mass tracks from the BT-Settl models (Allard et al. 2013) are shown. The blue hatched area indicates where lithium remains unburnt and detectable in the stellar photosphere. The 45 Myr-old accreting M5 dwarf WISE0808−6443 (Silverberg et al. 2016; Murphy et al. 2018) is also plotted. With a Gaia parallax of 9.8599 ± 0.0551 mas, the age of WISE0808−6443 is ~30 Myr and its mass is ~0.12 M⊙.
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