Constraints on the Gas-phase C/O Ratio of DR Tau's Outer Disk from CS, SO, and C2H Observations

Millimeter wavelength observations of Class II protoplanetary disks often display strong emission from hydrocarbons and high CS/SO values, providing evidence that the gas-phase C/O ratio commonly exceeds 1 in their outer regions. We present new NOEMA observations of CS 5–4, SO 76–65 and 56–45, C2H N...

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Bibliographic Details
Published in:The Astrophysical journal 2024-10, Vol.973 (2), p.135
Main Authors: Huang, Jane, Bergin, Edwin A., Le Gal, Romane, Andrews, Sean M., Bae, Jaehan, Keyte, Luke, Sturm, J. A.
Format: Article
Language:English
Subjects:
Astrochemistry
Emission
Emissions
Hydrocarbons
Millimeter astronomy
Planet formation
Protoplanetary disks
Sulfur dioxide
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Summary:Millimeter wavelength observations of Class II protoplanetary disks often display strong emission from hydrocarbons and high CS/SO values, providing evidence that the gas-phase C/O ratio commonly exceeds 1 in their outer regions. We present new NOEMA observations of CS 5–4, SO 76–65 and 56–45, C2H N = 3–2, HCN 3–2, HCO+ 3–2, and H13CO+ 3–2 in the DR Tau protoplanetary disk at a resolution of ∼0.″4 (80 au). Estimates for the disk-averaged CS/SO ratio range from ∼0.4 to 0.5, the lowest value reported thus far for a T Tauri disk. At a projected separation of ∼180 au northeast of the star, the SO moment maps exhibit a clump that has no counterpart in the other lines, and the CS/SO value decreases to
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ad6447