Centimeter-sized Grains in the Compact Dust Ring around Very-low-mass Star CIDA 1

• Published in: The Astronomical journal Vol. 166; no. 5; pp. 186 - 195
• Main Authors: Hashimoto, Jun, Liu, Hauyu Baobab, Dong, Ruobing, Liu, Beibei, Muto, Takayuki, Terada, Yuka
• Format: Journal Article
• Language: English
• Published: Madison The American Astronomical Society 01-11-2023; IOP Publishing
• Subjects: Astronomy; Deposition; Dust; Emissions; Grain growth; Grain size; Low mass stars; Opacity; Particle size; Planet formation; Protoplanetary disks; Radiative transfer; Radiative transfer calculations; Ring structures; Spatial distribution; Spatial resolution; Spectral energy distribution; Synchrotrons; T Tauri stars; Wavelengths
• ISSN: 0004-6256; 1538-3881
• DOI: 10.3847/1538-3881/acf3e9

Abstract
We examined the grain size in the dust ring encircling the 0.19
M
☉
T Tauri star CIDA 1 using the Karl G. Jansky Very Large Array at multiple centimeter wavelengths, with a spatial resolution of 0.″2–0.″9. We detected distinct partial-ring structures at these wavelengths around CIDA 1. Based on spatial distributions and spectral indices, we determined that these centimeter emissions originated from dust, rather than free–free or synchrotron emissions. To estimate the maximum grain size (
a
max
) within the ring, we compared the observed spectral energy distribution (SED) with SEDs calculated for different
a
max
values using radiative transfer calculations. Our findings indicate an
a
max
value of approximately 2.5 cm in the ring, assuming that the dust opacity can be approximated by the DSHARP models. These results suggest that grain growth took place within the CIDA 1 ring, potentially facilitating more efficient planet formation through pebble accretion scenarios involving centimeter-sized pebbles.