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SUMMARY:Orbital Evolution of Binaries in Circumbinary Disks - Magdelena Si
 wek\, Harvard University
DTSTART:20230303T130000Z
DTEND:20230303T140000Z
UID:TALK196249@talks.cam.ac.uk
CONTACT:Isobel Romero-Shaw
DESCRIPTION:I will present the to-date largest parameter space exploration
  of binaries in circumbinary disks (CBDs)\, deriving orbital evolution pre
 scriptions for eccentric\, unequal mass binaries from our suite of hydrody
 namic simulations. In all cases\, binary eccentricities evolve towards ste
 ady state values that increase with mass ratio\, and saturate at an equili
 brium eccentricity e_{b\,eq} ~ 0.5 in the large mass ratio regime\, in lin
 e with resonant theory. For binaries accreting at their combined Eddington
  limit\, a steady state eccentricity can be achieved within a few Megayear
 s. Once at their steady state eccentricities\, binaries with mass ratios g
 reater than q_b > 0.3 evolve towards coalescence\, while lower mass ratio 
 systems expand due to CBD torques. I will discuss implications for populat
 ion studies of massive black hole binaries\, protostars in binary systems\
 , and post-common envelope binaries observed by ground-based gravitational
  wave detectors.
LOCATION:Potter room/Zoom
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