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SUMMARY:Planet migration in weakly magnetised laminar discs - Clément Bar
 uteau and Jérôme Guilet (DAMTP)
DTSTART:20120501T120000Z
DTEND:20120501T130000Z
UID:TALK37987@talks.cam.ac.uk
CONTACT:Clement Baruteau
DESCRIPTION:Planet migration plays a crucial role in shaping planetary sys
 tems\, and has therefore received a lot of attention in recent years in an
  effort to compare the statistical properties of observed exoplanets with 
 the predictions of planet formation and migration theories. By modifying t
 he propagation properties of the waves induced by the planet in the disk\,
  the presence of a strong magnetic field can dramatically influence planet
  migration\, in some cases reversing its direction. The more realistic cas
 e of a weaker magnetic field is less clear\, although turbulent MHD simula
 tions by Baruteau et al (2011) suggest an effect on the corotation torque.
  We will describe a detailed study of the corotation torque in 2D laminar 
 disks containing a toroidal magnetic field. We performed MHD simulations t
 o study the interaction between the magnetic field and the horseshoe motio
 n of the gas\, and found that this results in an additional corotation tor
 que. This additional torque can be strong enough to reverse migration even
  for a field which pressure is only one percent of the thermal pressure.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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