Lupus disks with faint CO isotopologues: Low gas/dust or high carbon depletion?
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Abstract
An era has started in which gas and dust can be observed independently in
protoplanetary disks, thanks to the recent surveys with ALMA. The first
near-complete high-resolution disk survey in both dust and gas in a single
star-forming region has been carried out in Lupus, finding surprisingly low
gas/dust ratios. The goal of this work is to fully exploit CO isotopologues
observations in Lupus, comparing them with physical-chemical model results, in
order to obtain gas masses for a large number of disks. We have employed
physical-chemical models to analyze continuum and CO isotopologues observations
of Lupus disks, including isotope-selective processes and freeze-out. Employing
also the ALMA 13CO-only detections, disk gas masses have been calculated for a
total of 34 sources, expanding the sample of 10 disks studied by Ansdell et al.
(2016), where also C18O was detected. We confirm that overall gas-masses are
very low, often smaller than 1
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1432-0746