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SUMMARY:How planets make swirls: vorticity generation by oblique spiral sh
 ocks - Nicolas Cimerman (DAMTP\, Cambridge)
DTSTART:20191119T130000Z
DTEND:20191119T140000Z
UID:TALK129217@talks.cam.ac.uk
CONTACT:Chris Hamilton
DESCRIPTION:Recent high-resolution observations of protoplanetary discs ha
 ve shown that sub-structures like rings\, gaps and lopsided features are c
 ommon in their continuum dust emission. Using molecular lines\, the gas ki
 nematics have been shown to display similarly interesting features. One me
 chanism to explain such signatures is the interaction of one or more plane
 ts\nwith their birth environment\, driving waves due at resonances and ope
 ning gaps in the disc. From a theoretical point of view\, gap formation is
  important to understand as it determines the torque on the planet and aff
 ects its ability to excite waves and drive global disc evolution.\nI will 
 discuss a semi-analytical approach to try and predict the stability of pla
 net-induced gaps with regards to the Rossby-wave instability\, that leads 
 to vortex formation.\nFurthermore\, I will give an overview of recent deve
 lopments in the theory of Type II migration and discuss open questions.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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