NIKA2 observations of dust grain evolution from star-forming filament to T-Tauri disk: Preliminary results from NIKA2 observations of the Taurus B211/B213 filament
arxiv(2023)
摘要
To understand the evolution of dust properties in molecular clouds in the
course of the star formation process, we constrain the changes in the dust
emissivity index 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 at 1.2 mm and 2 mm with
unprecedented sensitivity and used the resulting maps to derive the dust
emissivity index β. Our sample of 105 objects detected in the β map
of the B211/B213 filament indicates that, overall, β decreases from
filament and prestellar cores (β∼ 2±0.5) to protostellar cores
(β∼ 1.2 ± 0.2) to T-Tauri protoplanetary disk (β < 1). The
averaged dust emissivity index β across the B211/B213 filament exhibits a
flat (β∼ 2±0.3) profile. This may imply that dust grain sizes are
rather homogeneous in the filament, 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. This
evolution from the parent filament to T-Tauri disks happens on a timescale of
about 1-2 Myr.
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