Probing protoplanetary disk evolution in the Chamaeleon II region

Context. Characterizing the evolution of protoplanetary disks is necessary to improve our understanding planet formation. Constraints on both dust and gas are needed determine dominant disk dissipation mechanisms. Aims. We aim compare masses in Chamaeleon II (Cha II) star-forming region with other regions ages between 1 10Myr. Methods. use ALMA band 6 observations (1.3 mm) survey 29 Cha II. Dust mass estimates derived from continuum data. Results. Out initial sample disks, we detect 22 sources continuum, 10 12CO, 3 13CO, none C18O (J=2-1). Additionally, two companion candidates 12CO emission. Most lower than 10Mearth, assuming thermal emission optically thin dust. consistent estimations distributions disk-to-stellar ratios six low isolated age range 1-10Myr: Upper Sco, CrA, IC 348, I, Lupus, Taurus. When comparing dust-to-stellar ratio, find that statistically different those Sco Taurus, confirm oldest sample, less massive all regions. Performing a second statistical test similar bins, no differences these Conclusions. interpret trends, most simply, as sign decline time or evolution. Different global conditions may also play role, but their impact properties population difficult isolate lacking nearby stars.