Orateur
Description
Understanding the evolution of dust properties in molecular clouds is important for tracing the star formation process through submm observations. We aim at constraining the evolution of dust grains from star-forming filaments to prestellar and protostellar cores to T Tauri stars. Using the NIKA2 continuum camera on the IRAM 30~m telescope, we observed the Taurus B211/B213 filament in the 1.2mm and 2mm wavebands with unprecedented sensitivity and used the resulting continuum maps to derive the dust emissivity index beta. Based on a sample of ~ 50 cores protostellar and prestellar cores in the B211/B213 filament, our results indicate that the dust emissivity index decreases from filaments and prestellar cores (beta~2) to protostellar cores (beta~1.7) to T Tauri stars (beta~1). This tentatively suggests that dust grains start to grow significantly in size only after the onset of the gravitational contraction/collapse of prestellar cores to protostars, reaching big sizes in T Tauri protoplanetary disks.
