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SUMMARY:Dead\, Undead and Zombie Zones in Protoplanetary Disks: Can the MR
 I survive? - Subhanjoy Mohanty (UCL)
DTSTART:20130305T130000Z
DTEND:20130305T140000Z
UID:TALK42692@talks.cam.ac.uk
CONTACT:Clement Baruteau
DESCRIPTION:The magneto-rotational instability (MRI) is currently the best
  candidate for supplying the anomalous viscosity required to drive accreti
 on in protoplanetary disks.  However\, most past studies have examined the
  MRI under ideal MHD conditions\, or considered only Ohmic dissipation.  W
 e show that the inclusion of dust grains and the effects of ambipolar diff
 usion can strongly suppress the MRI.  The resulting accretion rates are at
  least an order of magnitude lower than observed\, indicating that substan
 tial grain growth and settling is required for the MRI to be a viable mech
 anism\; this is consistent with the growth/settling observed in these disk
 s.  Moreover\, the accretion is also spatially and temporally variable\, p
 roducing over- and under-densities in the disk that have strong consequenc
 es for planet formation and inhibition of migration.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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