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DiskMINT: A Tool to Estimate Disk Masses with CO Isotopologues

Presentation #500.08 in the session Origin of Planetary Systems (Oral Presentation)

Published onOct 23, 2023
DiskMINT: A Tool to Estimate Disk Masses with CO Isotopologues

CO is one of the most abundant molecules in protoplanetary disks, and optically thin emission from its isotopologues has been detected in many of them. However, several past works have argued that reproducing the relatively low emission of CO isotopologues requires a very low disk mass or significant CO depletion. Here, we present a Python code, DiskMINT (Disk Model for INdividual Targets), which includes gas density and temperature structures that are both consistent with the thermal pressure gradient, isotope-selective chemistry, and conversion of CO into CO2 ice on grain-surfaces. The code generates a self-consistent disk structure, where the gas disk distribution is obtained from a Spectral Energy Distribution (SED)-derived dust disk structure with multiple grain sizes. The DiskMINT tool is then applied to the disk of RU~Lup as an example. RU~Lup is a high-accreting star whose disk was previously inferred to have only a Jupiter mass (~1.5×10-3 M) and gas-to-dust mass ratio of ~4. However, with DiskMINT, our model explains the total C18O luminosity as well as the C18O velocity and radial intensity profiles, and obtains a gas mass of ~1.2×10-2 M, an order of magnitude higher than previous results, and larger than the Minimum Mass Solar Nebula. We confirm that optically thin C18O rotational lines provide reasonable estimates of the disk mass and can therefore be used as gas disk tracers. The DiskMINT code is also released so that the community can extend this approach to other disks.

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