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

Abstract

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. Wemore » 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.« less

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [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)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1542839
Report Number(s):
LA-UR-18-26756
Journal ID: ISSN 1538-4357
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 867; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy and Astrophysics; hydrodynamics; instabilities; line: profiles; planet; disk interactions; protoplanetary disks; submillimeter: planetary systems

Citation Formats

Huang, Pinghui, Isella, Andrea, Li, Hui, Li, Shengtai, and Ji, Jianghui. Identifying Anticyclonic Vortex Features Produced by the Rossby Wave Instability in Protoplanetary Disks. United States: N. p., 2018. Web. doi:10.3847/1538-4357/aae317.
Huang, Pinghui, Isella, Andrea, Li, Hui, Li, Shengtai, & Ji, Jianghui. Identifying Anticyclonic Vortex Features Produced by the Rossby Wave Instability in Protoplanetary Disks. United States. doi:10.3847/1538-4357/aae317.
Huang, Pinghui, Isella, Andrea, Li, Hui, Li, Shengtai, and Ji, Jianghui. Thu . "Identifying Anticyclonic Vortex Features Produced by the Rossby Wave Instability in Protoplanetary Disks". United States. doi:10.3847/1538-4357/aae317. https://www.osti.gov/servlets/purl/1542839.
@article{osti_1542839,
title = {Identifying Anticyclonic Vortex Features Produced by the Rossby Wave Instability in Protoplanetary Disks},
author = {Huang, Pinghui and Isella, Andrea and Li, Hui and Li, Shengtai and Ji, Jianghui},
abstractNote = {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.},
doi = {10.3847/1538-4357/aae317},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 867,
place = {United States},
year = {2018},
month = {10}
}

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    Works referencing / citing this record:

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