Physics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..284k&link_type=abstract
Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam
Physics
Scientific paper
We carried out 2.5-dimensional resistive magnetohydrodynamic simulations to study the effects of magnetic diffusivity on the magnetically driven mass accretion and jet formation. When a constant angular momentum torus is threaded by large-scale vertical magnetic fields, the angular momentum of the torus is extracted due to magnetic braking and the torus medium falls toward the central region. The large-scale magnetic fields twisted by the infalling matter drives bipolar jets. We studied the dependence of the mass accretion rate and the mass out flow rate on magnetic diffusivity η0=η/(vK0r0), where r0 is the reference radius and vK0 is the Keplerian rotation speed at r=r0. We found that (1) in non-diffusive or low diffusive model (η0 < 10-3), the mass accretion and the jet formation take place intermittently, (2) in mildly diffusive model (10-3< η0 <10-2), the system evolves toward a quasi-steady state, (3) in highly diffusive model (η0>10-2), accretion/mass outflow rate reduces with η0 and approaches 0.
Kuwabara Takao
Matsumoto Ryo
Shibata Kazunari
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