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Title:
Angular momentum transport in protostellar discs
Authors:
Salmeron, Raquel; Königl, Arieh; Wardle, Mark
Affiliation:
AA(Department of Astronomy & Astrophysics, The University of Chicago, Chicago, IL 60637, USA; Research School of Astronomy & Astrophysics and Research School of Earth Sciences, The Australian National University), AB(Department of Astronomy & Astrophysics, The University of Chicago, Chicago, IL 60637, USA), AC(Physics Department, Macquarie University, Sydney, NSW 2109, Australia)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 375, Issue 1, pp. 177-183. (MNRAS Homepage)
Publication Date:
02/2007
Origin:
MNRAS
MNRAS Keywords:
accretion, accretion discs , MHD , stars: formation , ISM: jets and outflows
Abstract Copyright:
(c) 2006 The Authors. Journal compilation © 2006 RAS
DOI:
10.1111/j.1365-2966.2006.11277.x
Bibliographic Code:
2007MNRAS.375..177S

Abstract

Angular momentum transport in protostellar discs can take place either radially, through turbulence induced by the magnetorotational instability (MRI), or vertically, through the torque exerted by a large-scale magnetic field that threads the disc. Using semi-analytic and numerical results, we construct a model of steady-state discs that includes vertical transport by a centrifugally driven wind as well as MRI-induced turbulence. We present approximate criteria for the occurrence of either one of these mechanisms in an ambipolar diffusion-dominated disc. We derive `strong field' solutions in which the angular momentum transport is purely vertical and `weak field' solutions that are the stratified-disc analogues of the previously studied MRI channel modes; the latter are transformed into accretion solutions with predominantly radial angular momentum transport when we implement a turbulent-stress prescription based on published results of numerical simulations. We also analyse `intermediate field strength' solutions in which both modes of transport operate at the same radial location; we conclude, however, that significant spatial overlap of these two mechanisms is unlikely to occur in practice. To further advance this study, we have developed a general scheme that incorporates also the Hall and Ohm conductivity regimes in discs with a realistic ionization structure.
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