ALMA Survey of Lupus Protoplanetary Disks II: Gas Disk Radii
M. Ansdell, J. P. Williams, L. Trapman, S. E. van Terwisga, S., Facchini, C.F. Manara, N. van der Marel, A. Miotello, M. Tazzari, M., Hogerheijde, G. Guidi, L. Testi, E. F. van Dishoeck

TL;DR
This study uses ALMA observations to measure gas and dust disk sizes in Lupus star-forming region, revealing larger gas disks, diverse viscosity parameters, and grain growth trends, advancing understanding of disk evolution.
Contribution
First comprehensive ALMA survey of gas and dust disk radii in Lupus, providing new insights into disk structure, viscosity, and grain growth.
Findings
Gas disks are on average twice as large as dust disks.
Viscosity parameter alpha_visc shows broad distribution with no clear correlations.
Anti-correlation between mm spectral index and flux suggests faster grain growth in more massive disks.
Abstract
We present ALMA Band 6 observations of a complete sample of protoplanetary disks in the young (1-3 Myr) Lupus star-forming region, covering the 1.33 mm continuum and the 12CO, 13CO, and C18O J=2-1 lines. The spatial resolution is 0.25 arcsec with a medium 3-sigma continuum sensitivity of 0.30 mJy, corresponding to M_dust ~ 0.2 M_earth. We apply "Keplerian masking" to enhance the signal-to-noise ratios of our 12CO zero-moment maps, enabling measurements of gas disk radii for 22 Lupus disks; we find that gas disks are universally larger than mm dust disks by a factor of two on average, likely due to a combination of the optically thick gas emission as well as the growth and inward drift of the dust. Using the gas disk radii, we calculate the dimensionless viscosity parameter, alpha_visc, finding a broad distribution and no correlations with other disk or stellar parameters, suggesting…
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