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SUMMARY:The interaction of binary stars and their accretion disc - Anna Pe
 nzlin (Imperial College London)
DTSTART:20241202T140000Z
DTEND:20241202T150000Z
UID:TALK222931@talks.cam.ac.uk
CONTACT:Loren E. Held
DESCRIPTION:About half of all stars are part of a binary or multiple confi
 guration\, and many of them form together surrounded by a common circumbin
 ary disc is shaped by the interaction with the binary and changes the bina
 ry's orbit. One of the complications in this system is to understand the e
 ffects of the viscosity and temperature in this system. We will look at th
 is problem using numerical hydrodynamic simulations in 2D over long time-s
 cales that allow the binary to excite eccentricities in the disc and show 
 the variation in the binary-disc interaction during the precession of the 
 circumbinary disc. Scanning a wide parameter spaces of viscosities reveals
  a non-monotonic behaviour in the excitation of the disc. The impact of di
 sc thermodynamics can further change how effective this excitation can be.
  By looking at different scale ranges from close Kepler binary planet-like
  systems to wide binary systems like GG Tau\, the shape of the disc change
 s depending on how effective the disc can cool and relax. And this can exp
 lain the current observation of stellar circumbinary disc.
LOCATION:MR14 DAMTP and online
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