Abstract

ALMA line surveys offer a unique opportunity to study large populations of protoplanetary disks with low integration times per source. However, classic image-plane analyses are limited in their ability to accurately extract bulk gas disk properties (i.e. sizes and fluxes) from the resulting moderate angular resolution data. In this talk, I present measurements of key disk properties inferred from parametric modeling of ALMA Band 7 12CO (J=3-2) spectral line visibilities. From these models, I derive gas-disk radii, integrated fluxes, optically thick emission layers, and brightness temperature profiles for the disk population in the old (4–14 Myr) Upper Scorpius star-forming region, using moderate angular resolution observations (0.1–0.3″). Furthermore, I show how disk-based stellar mass estimates can be used to benchmark pre-main-sequence evolutionary tracks.