We present new optical spectroscopy with FLAMES/VLT , near-IR imaging with HAWK-I/VLT , and 870 \mu m mapping with APEX/LABOCA of the Coronet cluster .
The optical data allow to estimate spectral types , extinction and the presence of accretion in 6 more M-type members , in addition to the 12 that we had previously studied .
The submillimeter maps and near-IR data reveal the presence of nebular structures and high extinction regions , which are in some cases associated to known IR , optical , and X-ray sources .
Most star formation is associated to two elongated structures crossing in the central part of the cluster .
Placing all the 18 objects with known spectral types and extinction in the HR diagram suggests that the cluster is younger than previously thought ( < 2 Myr , and probably \sim 0.5-1 Myr ) .
The new age estimate is in agreement with the evolutionary status of the various protostars in the region and with its compactness ( < 1.3 pc across ) , but results in a conflict with the low disk and accretion fraction ( only 50-65 % of low-mass stars appear to have protoplanetary disks , and most transitional and homologously depleted disks are consistent with no accretion ) and with the evolutionary features observed in the mid-IR spectra and spectral energy distributions of the disks .