Protostellar jets and magnetic diffusion

Details Protostellar jets and magnetic diffusion Protostellar jets and magnetic diffusion

2002-11-22

arxiv.org/abs/astro-ph/0211513v1

Astronomy and Astrophysics

Astrophysics

To appear in A.J.L. Fernandes et al. (eds), Kluwer 2003, proceedings of the JENAM 2002 meeting "Jets 2002: Theory and Observat

Scientific paper

We investigate the evolution of a disk wind into a collimated jet under the influence of magnetic diffusivity. Using the ZEUS-3D code in the axisymmetry option we solve the time-dependent resistive MHD equations for a model setup of a central star surrounded by an accretion disk. The disk is taken as a time-independent boundary condition for the mass flow rate and the magnetic flux distribution. We find that the diffusive jets propagate slower into the ambient medium, most probably due to the lower mass flow rate in axial direction. Close to the star we find that a quasi stationary state evolves after several hundreds (weak diffusion) or thousands (strong diffusion) of disk rotations. Magnetic diffusivity affects the protostellar jet structure de-collimating it. We explain these effects in the framework of the Lorentz force.

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