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SUMMARY:Dynamics in gas is different - Mor Rozner (Technion-Israel Institu
 te of Technology)
DTSTART:20240226T140000Z
DTEND:20240226T150000Z
UID:TALK209044@talks.cam.ac.uk
CONTACT:Thomas Jannaud
DESCRIPTION:Gaseous environments are abundant in the Universe and include 
 AGN disks\, star-forming regions\, protoplanetary disks and regions of lat
 e star formation in globular clusters. While the dynamics of binaries in g
 as-free environments have been studied extensively\, gas-rich environments
  are fertile ground for phenomena that are still largely unexplored\, and 
 in this talk\, we will discuss some of the unique phenomena of dynamics in
  gas. Binaries tend statistically to get softer as they encounter other st
 ars\, according to Heggie's law. However\, in gaseous environments\, this 
 law should be modified as gas-hardening could lead to a significant energy
  dissipation that could dominate over stellar softening. Here we explore t
 he effect of gas hardening on the softening rate of binaries and its impli
 cations. We will also discuss gas-assisted binary formation. In gaseous me
 dia\, interactions between two initially unbound objects could result in g
 as-assisted binary formation\, induced by a loss of kinetic energy to the 
 ambient gas medium. Here\, we derive analytically the criteria for gas-ass
 isted binary capture through gas dynamical friction dissipation. In some e
 nvironments\, these captures could occur more than once per object\, leadi
 ng to multicaptures. We will discuss that and further implications.
LOCATION:MR14 DAMTP and online
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