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Identifying Anticyclonic Vortex Features Produced by the Rossby Wave Instability in Protoplanetary Disks

Journal Article · · The Astrophysical Journal (Online)
 [1];  [2];  [3];  [3];  [4]
  1. Chinese Academy of Sciences, Nanjing (People's Republic of China); Univ. of Chinese Academy of Sciences, Beijing (People's Republic of China); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Rice Univ., Houston, TX (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Chinese Academy of Sciences, Nanjing (People's Republic of China)
Several nearby protoplanetary disks have been observed to display large-scale crescents in the (sub)millimeter dust continuum emission. One interpretation is that these structures correspond to anticyclonic vortices generated by the Rossby wave instability within the gaseous disk. Such vortices have local gas overdensities and are expected to concentrate dust particles with a Stokes number around unity. This process might catalyze the formation of planetesimals. Whereas recent observations showed that dust crescents are indeed regions where millimeter-size particles have abnormally high concentration relative to the gas and smaller grains, no observations have yet shown that the gas within the crescent region counterrotates with respect to the protoplanetary disk. Here we investigate the detectability of anticyclonic features through measurement of the line-of-sight component of the gas velocity obtained with ALMA. We carry out 2D hydrodynamic simulations and 3D radiative transfer calculations of a protoplanetary disk characterized by a vortex created by the tidal interaction with a massive planet. As a case study, the disk parameters are chosen to mimic the IRS 48 system, which has the most prominent crescent observed to date. We generate synthetic ALMA observations of both the dust continuum and 12CO emission around the frequency of 345 GHz. We find that the anticyclonic features of the vortex are weak but can be detected if both the source and the observational setup are properly chosen. We provide a recipe for maximizing the probability of detecting such vortex features and present an analysis procedure to infer their kinematic properties.
Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
LDRD; USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1542839
Report Number(s):
LA-UR--18-26756
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 867; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Signatures of an eccentric disc cavity: Dust and gas in IRS 48 journal October 2019
High-resolution ALMA Observations of HD 100546: Asymmetric Circumstellar Ring and Circumplanetary Disk Upper Limits journal January 2019
Observational Signatures of Planets in Protoplanetary Disks: Planet-induced Line Broadening in Gaps journal January 2019
New Constraints on the Dust and Gas Distribution in the LkCa 15 Disk from ALMA journal August 2019
Including Dust Coagulation in Hydrodynamic Models of Protoplanetary Disks: Dust Evolution in the Vicinity of a Jupiter-mass Planet journal November 2019
Kinematic Detections of Protoplanets: A Doppler Flip in the Disk of HD 100546 journal October 2019
Spiral Structure in the Gas Disk of TW Hya journal October 2019
Ring Morphology with Dust Coagulation in Protoplanetary Disks journal January 2020
High-Resolution ALMA Observations of HD100546: Asymmetric Circumstellar Ring, and Circumplanetary Disk Upper Limits text January 2018
New constraints on the dust and gas distribution in the LkCa 15 disk from ALMA text January 2019
High-resolution ALMA Observations of HD 100546: Asymmetric Circumstellar Ring and Circumplanetary Disk Upper Limits text January 2019

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