Angular momentum transport in protostellar discs
| dc.creator | Salmeron, Raquel | |
| dc.creator | Konigl, Arieh | |
| dc.creator | Wardle, Mark | |
| dc.date | 2006-11-11 | |
| dc.date.accessioned | 2026-07-07T10:20:46Z | |
| dc.date.available | 2026-07-07T10:20:46Z | |
| dc.description | 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 analyze ``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. | |
| dc.description | 8 pages, 4 figures, 1 table; accepted for publication in MNRAS | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0611359 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0611359 | |
| dc.identifier | Mon.Not.Roy.Astron.Soc.375:177-183,2007 | |
| dc.identifier | doi:10.1111/j.1365-2966.2006.11277.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/174959 | |
| dc.subject | Astrophysics | |
| dc.title | Angular momentum transport in protostellar discs | |
| dc.type | text |