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SUMMARY:Streaming instabilities in vortices - Nathan Magnan\, DAMTP
DTSTART:20221124T130000Z
DTEND:20221124T140000Z
UID:TALK192530@talks.cam.ac.uk
CONTACT:Callum William Fairbairn
DESCRIPTION:Vortices\, as non-axisymmetric dust traps\, are a popular opti
 on to bridge the meter gap of planet formation. In particular\, vortices a
 re thought to concentrate dust to the point where the streaming instabilit
 y (SI) becomes viable. But the SI is a disk instability\, and it is not kn
 own whether it is active in vortices. In the first half of the talk\, I in
 vestigate this question from the analytical front\, by building a model fo
 r dusty vortices and studying its linear stability. I find that dusty vort
 ices are unstable\, and that the instability is a resonant drag instabilit
 y (RDI)\, similar in some regards to the SI. My new instability offers a w
 ay to interpret simulations of dusty vortices\, and strengthens the case f
 or vortex-catalysed planet formation.\n\nIn the second half of the talk\, 
 I build a simple physical picture for RDIs\, in particular the SI. I find 
 that RDIs are built on two familiar mechanisms: In the first one\, a gas w
 ave concentrates dust.  In the second one\, a drifting dust clump excites 
 gas waves. These mechanisms are usually transient and independent of each 
 other\, but at resonance they both become algebraically unstable\, and the
 y start feeding into each other. My model closes a long discussion on the 
 mechanism behind the SI\, and provides a solid footing upon which to base 
 future RDI investigations.
LOCATION:In Person MR12
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