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SUMMARY:Dynamics in gas is different - Mor Rozner\, IoA / DAMTP
DTSTART:20241009T124000Z
DTEND:20241009T130500Z
UID:TALK222484@talks.cam.ac.uk
CONTACT:Xander Byrne
DESCRIPTION:Gas-rich environments are abundant in the Universe and include
  AGN disks\, star-forming regions\, protoplanetary disks and regions of la
 te star formation in globular clusters. While the dynamics of binaries in 
 gas-free environments have been studied extensively\, gas-rich environment
 s are fertile ground for phenomena that are still largely unexplored\, and
  in this talk\, we will discuss some of the unique phenomena of dynamics i
 n gas.\nBinaries tend statistically to get softer as they encounter other 
 stars\, according to Heggie's law. However\, in gas-rich environments\, th
 is law should be modified as gas-hardening could lead to a significant ene
 rgy dissipation that could dominate over stellar softening. Here we explor
 e the effect of gas hardening on the softening rate of binaries and its im
 plications. \nWe will also discuss gas-assisted binary formation. In gaseo
 us media\, interactions between two initially unbound objects could result
  in gas-assisted binary formation\, induced by a loss of kinetic energy to
  the ambient gas medium. Here\, we derive analytically the criteria for ga
 s-assisted binary capture through gas dynamical friction dissipation.\nIn 
 some environments\, these captures could occur more than once per object\,
  leading to multicaptures. We will discuss that and further implications.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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