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In recent years, the disk populations in a number of young star-formingregions have been surveyed with ALMA. Understanding the disk properties andtheir correlation with those of the central star is critical to understandplanet formation. In particular, a decrease of the average measured disk dustmass with the age of the region has been observed. We conductedhigh-sensitivity continuum ALMA observations of 43 Class II young stellarobjects in CrA at 1.3 mm (230 GHz). The typical spatial resolution is 0.3". Thecontinuum fluxes are used to estimate the dust masses of the disks, and asurvival analysis is performed to estimate the average dust mass. We alsoobtained new VLT/X-Shooter spectra for 12 of the objects in our sample. 24disks are detected, and stringent limits have been put on the average dust massof the non-detections. Accounting for the upper limits, the average disk massin CrA is $6\pm3\,\rm M_\oplus$, significantly lower than that of disks inother young (1-3 Myr) star forming regions (e.g. Lupus) and appears consistentwith the 5-10 Myr old Upper Sco. The position of the stars in our sample on theHR diagram, however, seems to confirm that that CrA has age similar to Lupus.Neither external photoevaporation nor a lower than usual stellar massdistribution can explain the low disk masses. On the other hand, a low-massdisk population could be explained if the disks are small, which could happenif the parent cloud has a low temperature or intrinsic angular momentum, or ifthe the angular momentum of the cloud is removed by some physical mechanismsuch as magnetic braking. In order to fully explain and understand the dustmass distribution of protoplanetary disks and their evolution, it may also benecessary to take into consideration the initial conditions of star and diskformation process, which may vary from region to region, and affect planetformation.

ALMA survey of Class II protoplanetary disks in Corona Australis: a young region with low disk masses