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SUMMARY:(Pierrehumbert) Climate dynamics of lava planets. (Zanazzi) Circum
 binary Disk Dynamics around Eccentric Binaries - Ray Pierrehumbert (Oxford
 ) &amp\; JJ Zanazzi (Cornell)
DTSTART:20170518T100000Z
DTEND:20170518T113000Z
UID:TALK72242@talks.cam.ac.uk
CONTACT:Ed Gillen
DESCRIPTION:(Zanazzi) It is usually assumed that viscous disk torques work
  to align circumbinary disks with the binary's orbital plane.  However\, M
 artin and Lubow recently used smoothed particle hydrodynamics simulations 
 to show a circumbinary disk may evolve to a configuration perpendicular to
  the binary's orbital plane (polar alignment)\, if the binary is sufficien
 tly eccentric.  In this work\, we generalize previous dynamical studies of
  disk warping in circumbinary disks to arbitrary mutual binary-disk inclin
 ations and binary eccentricities\, calculating the disk warp profile and d
 issipative viscous torques acting on the disk.  We provide a simple analyt
 ic criterion for when a circumbinary disk evolves to be polar with the ecc
 entric binary.  We also calculate the probability a disk will evolve to be
  polar with the binary\, given the initial binary disk inclination and bin
 ary eccentricity.  Due to the ubiquity of order unity binary eccentricitie
 s in circumbinary disk systems\, this work has important implications on t
 he formation and evolution of circumbinary disks\, as well as the inclinat
 ion distribution of circumbinary planets.
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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