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Particle Trapping and Streaming Instability in Vortices in Protoplanetary Disks

Raettig, Natalie and Klahr, Hubert and Lyra, Wladimir (2015) Particle Trapping and Streaming Instability in Vortices in Protoplanetary Disks. Astrophysical Journal, 804 (1). Art. No. 35. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20150605-135643040

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Abstract

We analyze the concentration of solid particles in vortices created and sustained by radial buoyancy in protoplanetary disks, e.g., baroclinic vortex growth. Besides the gas drag acting on particles, we also allow for back-reaction from dust onto the gas. This becomes important when the local dust-to-gas ratio approaches unity. In our two-dimensional, local, shearing sheet simulations, we see high concentrations of grains inside the vortices for a broad range of Stokes numbers, St. An initial dust-to-gas ratio of 1:100 can easily be reversed to 100:1 for St = 1.0. The increased dust-to-gas ratio triggers the streaming instability, thus counter-intuitively limiting the maximal achievable overdensities. We find that particle trapping inside vortices opens the possibility for gravity assisted planetesimal formation even for small particles (St = 0.01) and a low initial dust-to-gas ratio of 1:10^4, e.g., much smaller than in the previously studied magnetohydrodynamic zonal flow case.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/804/1/35DOIArticle
http://iopscience.iop.org/0004-637X/804/1/35/PublisherArticle
ORCID:
AuthorORCID
Lyra, Wladimir0000-0002-3768-7542
Additional Information:© 2015 The American Astronomical Society. Received 12 August 2013, accepted for publication 22 November 2014; Published 28 April 2015. The authors gratefully acknowledge the Gauss Centre for Supercomputing (GCS) for providing computing time for a GCS Large Scale Project on the GCS share of the supercomputer JUQUEEN at Jülich Supercomputing Centre (JSC). GCS is the alliance of the three national supercomputing centres HLRS (Universität Stuttgart), JSC (Forschungszentrum Jülich), and LRZ (Bayerische Akademie der Wissenschaften), funded by the German Federal Ministry of Education and Research (BMBF) and the German State Ministries for Research of Baden-Württemberg (MWK), Bayern (StMWFK), and Nordrhein-Westfalen (MIWF).
Funders:
Funding AgencyGrant Number
German Federal Ministry of Education and Research (BMBF)UNSPECIFIED
German State Ministries for Research of Baden-Württemberg (MWK)UNSPECIFIED
Bayern (StMWFK)UNSPECIFIED
Nordrhein-Westfalen (MIWF)UNSPECIFIED
Subject Keywords:accretion, accretion disks; hydrodynamics; instabilities; methods: numerical; turbulence
Issue or Number:1
Record Number:CaltechAUTHORS:20150605-135643040
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150605-135643040
Official Citation:Particle Trapping and Streaming Instability in Vortices in Protoplanetary Disks Natalie Raettig et al. 2015 ApJ 804 35
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58057
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:08 Jun 2015 21:23
Last Modified:09 Mar 2020 13:19

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