Young (sub)stellar obj. X-Shooter spectra

We find the slopes of the accretion relationships (L*-L_acc_, M*-(dM_acc_/dt)) to steepen in the 1-3Myr age range (i.e. between Ophiuchus, Lupus and Chamaeleon-I), and that both relationships may be better described with a single power law. We find that previous claims for a double power law behavior of the M*-(dM_acc_/dt) relationship may have been triggered by the use of a different SpT-Teff scale. We also find the relationship between the protoplanetary disk mass and the mass accretion rate of the stellar population to steepen with time down to the age of Upper Scorpius.

Overall, we observe hints of a faster evolution into low accretion rates of low-mass stars and brown dwarfs. At the same time, we also found that brown dwarfs present larger M_disk_/(dM_acc_/dt) ratios (i.e. longer accretion depletion timescales) than stars in Ophiuchus, Lupus and Cha-I. This apparently contradictory result may imply that the evolution of protoplanetary disks around brown dwarfs may be different than in the stellar regime.