We study the effect of poloidal magnetic field on type I planetary migration by linear perturbation analysis with the shearing-sheet approximation and the analytic results are compared with numerical calculation. We investigate the cases where magneto-rotational instability (MRI) does not occur: either the disk is two-dimensional, or a very strong field is exerted. We derive formulae for torque exerted on the planet for both cases. We find that two-dimensional torque is suppressed when plasma beta is less than 1 and three-dimensional modes dominate, in contrast to unmagnetized case.
|Number of pages||6|
|Journal||Proceedings of the International Astronomical Union|
|Publication status||Published - Oct 2007|
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science