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SUMMARY:Long-Term Evolution of Circumbinary Accretion Disks - Ryan Miranda
  (IAS\, Princeton)
DTSTART:20171009T130000Z
DTEND:20171009T140000Z
UID:TALK80711@talks.cam.ac.uk
CONTACT:Dr. Yufeng Lin
DESCRIPTION:Disks around binaries may be found in a variety of astrophysic
 al contexts\, including around young stellar binaries and supermassive bla
 ck hole binaries. I will present the results of hydrodynamical simulations
  of circumbinary accretion disks\, focusing on their long-term evolution o
 ver secular and viscous timescales. Carefully chosen initial conditions an
 d boundary conditions are used to ensure that the disk reaches a quasi-ste
 ady state\, in which the time-averaged mass accretion rate onto the binary
  matches the mass supply rate at the outer disk. I will discuss the excita
 tion of disk eccentricity by the binary\, and how the coherent precession 
 of the eccentric disk depends on the binary and disk parameters. I will al
 so discuss the detailed balance of angular momentum transport through the 
 disk by advection\, viscous stress\, and gravitational torque\, from which
  the time-averaged net angular momentum transfer rate to the binary is det
 ermined. The specific angular momentum characterizing the angular momentum
  transfer\, which depends on the binary eccentricity in a non-monotonic ma
 nner\, is usually positive\, implying that the the binary separation may g
 row in time.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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