Journal Article

Linear transport in fully stratified discs

Francesco Volponi

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 1, pages 551-557
Published in print July 2010 | ISSN: 0035-8711
Published online July 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16688.x
Linear transport in fully stratified discs

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We consider the evolution of linear non-axisymmetric perturbations in discs with radially and vertically stratified equilibria. We work in the shearing sheet and Boussinesq approximations. We choose density and pressure equilibrium fields compatible with a background flow depending only on the radial pseudo-Cartesian coordinate x. We find that, for unstable vertical and radial stratifications, trailing waves can transport angular momentum outwardly. This occurs when entropy gradients with respect to x and z coordinates have the same sign and the wavenumbers ratio kz/ky is less than a critical value, which depends on the radial Richardson number and the shear parameter.

Keywords: accretion, accretion discs; convection; hydrodynamics; instabilities

Journal Article.  3563 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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