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Physical models of streaming instabilities in protoplanetary disks

Squire, Jonathan and Hopkins, Philip F. (2020) Physical models of streaming instabilities in protoplanetary disks. . (Unpublished)

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We develop simple, physically motivated models for drag-induced dust-gas streaming instabilities, which are thought to be crucial for clumping grains to form planetesimals in protoplanetary disks. The models explain, based on the physics of gaseous epicyclic motion and dust-gas drag forces, the most important features of the streaming instability and its simple generalisation, the disk settling instability. Some of the key properties explained by our models include the sudden change in the growth rate of the streaming instability when the dust-to-gas-mass ratio surpasses one, the slow growth rate of the streaming instability compared to the settling instability for smaller grains, and the main physical processes underlying the growth of the most unstable modes in different regimes. As well as providing helpful simplified pictures for understanding the operation of an interesting and fundamental astrophysical fluid instability, our models may prove useful for analysing simulations and developing nonlinear theories of planetesimal growth in disks.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Squire, Jonathan0000-0001-8479-962X
Hopkins, Philip F.0000-0003-3729-1684
Additional Information:We thank P. Benítez-Llambay, J. Goodman, L. Krapp, and M. Pessah, for helpful discussions. Support for JS was provided by Rutherford Discovery Fellowship RDF-U001804 and Marsden Fund grant UOO1727, which are managed through the Royal Society Te Apārangi. Support for PFH was provided by NSF Collaborative Research Grants 1715847 & 1911233, NSF CAREER grant 1455342, and NASA grants 80NSSC18K0562 and JPL 1589742.
Group:Astronomy Department, TAPIR
Funding AgencyGrant Number
Royal Society Te ApārangiRDF-U001804
Royal SocietyUOO1727
Record Number:CaltechAUTHORS:20200309-151230451
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101796
Deposited By: Tony Diaz
Deposited On:09 Mar 2020 22:42
Last Modified:09 Mar 2020 22:42

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