The interaction of binary stars and their accretion disc

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• Anna Penzlin (Imperial College London)
• Monday 02 December 2024, 14:00-15:00
• MR14 DAMTP and online.

If you have a question about this talk, please contact Loren E. Held.

About half of all stars are part of a binary or multiple configuration, and many of them form together surrounded by a common circumbinary disc is shaped by the interaction with the binary and changes the binary’s orbit. One of the complications in this system is to understand the effects of the viscosity and temperature in this system. We will look at this problem using numerical hydrodynamic simulations in 2D over long time-scales 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 disc 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 changes depending on how effective the disc can cool and relax. And this can explain the current observation of stellar circumbinary disc.

This talk is part of the DAMTP Astrophysics Seminars series.

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