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3D global MHD simulations of a proto-planetary disk: dead zone and large-scale magnetic fields

Published online by Cambridge University Press:  01 November 2008

Natalia Dzyurkevich
Affiliation:
Max-Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: natalia@mpia.de
Mario Flock
Affiliation:
Max-Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: natalia@mpia.de
Hubert Klahr
Affiliation:
Max-Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: natalia@mpia.de
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Abstract

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We present 3D global MHD simulations of proto-planetary disks calculated with the ZeusMP code. We focus on gas dynamics; the magnetic diffusivity and temperature are fixed during the simulation. A zone with low gas ionization at the midplane is included within ±2 scale heights. We mimic the ‘snow’-line radius with one order of magnitude jump in magnetic diffusivity η. Resulting turbulent Maxwell and Reynolds stresses are present at the midplane despite of low ionization. We find no radial inhomogeneities in turbulent α stress for a mild ionization contrast at the ‘snow’-line. A smooth azimuthal magnetic field is produced in the dead zone which may be a driving force for a weak accretion flow.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2009

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