ALMA observations of asymmetric molecular gas emission from a protoplanetary disk in the orion nebula

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DOIResolve DOI: http://doi.org/10.3847/1538-3881/aa6c2c
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleThe Astronomical Journal
ISSN‎0004-6256
1538-3881
Volume153
Issue3
Pages# of pages: 17
Subjectplanets and satellite: formation; protoplanetary disks; radio line: planetary systems; stars: individual (V2377 Ori); stars: pre-main sequence
AbstractWe present Atacama Large Millimeter/submillimeter Array (ALMA) observations of molecular line emission from d216-0939, one of the largest and most massive protoplanetary disks in the Orion Nebula Cluster. We model the spectrally resolved HCO+ (4–3), CO (3–2), and HCN (4–3) lines observed at 0".5 resolution to fit the temperature and density structure of the disk. We also weakly detect and spectrally resolve the CS (7–6) line but do not model it. The abundances we derive for CO and HCO+ are generally consistent with expected values from chemical modeling of protoplanetary disks, while the HCN abundance is higher than expected. We dynamically measure the mass of the central star to be 2.17 ± 0.07M., which is inconsistent with the previously determined spectral type of K5. We also report the detection of a spatially unresolved high-velocity blueshifted excess emission feature with a measurable positional offset from the central star, consistent with a Keplerian orbit at 60 ± 20 au. Using the integrated flux of the feature in HCO+ (4–3), we estimate the total H2 gas mass of this feature to be at least 1.8-8MJupiter, depending on the assumed temperature. The feature is due to a local temperature and/or density enhancement consistent with either a hydrodynamic vortex or the expected signature of the envelope of a forming protoplanet within the disk.
Publication date
PublisherThe American Astronomical Society
LanguageEnglish
AffiliationNational Research Council Canada; NRC Herzberg Astronomy and Astrophysics
Peer reviewedYes
NPARC number23002192
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Record identifier1c677a00-55d5-4404-af4d-9eb1d888eba3
Record created2017-08-31
Record modified2017-08-31
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