Radial and vertical angular momentum transport in protostellar discs

Article

Salmeron, Raquel, Konigl, Arieh and Wardle, Mark. 2007. "Radial and vertical angular momentum transport in protostellar discs." Astrophysics and Space Science: an international journal of astronomy, astrophysics and space science. 311 (1-3), pp. 81-85. https://doi.org/10.1007/s10509-007-9563-z
Article Title

Radial and vertical angular momentum transport in protostellar discs

ERA Journal ID1059
Article CategoryArticle
AuthorsSalmeron, Raquel (Author), Konigl, Arieh (Author) and Wardle, Mark (Author)
Journal TitleAstrophysics and Space Science: an international journal of astronomy, astrophysics and space science
Journal Citation311 (1-3), pp. 81-85
Number of Pages5
Year2007
PublisherSpringer
Place of PublicationNetherlands
ISSN0004-640X
1572-946X
Digital Object Identifier (DOI)https://doi.org/10.1007/s10509-007-9563-z
Web Address (URL)https://link.springer.com/article/10.1007/s10509-007-9563-z
Abstract

Angular momentum in protostellar discs can be transported either radially, through turbulence induced by the magnetorotational instability (MRI), or vertically, through the torque exerted by a large-scale magnetic field. We present a model of steady-state discs where these two mechanisms operate at the same radius and derive approximate criteria for their occurrence in an ambipolar diffusion dominated disc. We obtain 'weak field' solutions-which we associate with the MRI channel modes in a stratified disc-and transform them into accretion solutions with predominantly radial angular-momentum transport by implementing a turbulent-stress prescription based on published results of numerical simulations. We also analyze 'intermediate field strength' solutions in which both radial and vertical transport operate at the same radial location. Our results suggest, however, that this overlap is unlikely to occur in real discs.

KeywordsAccretion; Accretion discs; ISM: jets and outflows; MHD; Stars: formation
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020510109. Stellar astronomy and planetary systems
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Byline AffiliationsAustralian National University
University of Chicago, United States
Macquarie University
Institution of OriginUniversity of Southern Queensland
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