Journal Article

Wave angular momentum and the evolution of planetary rings

I. L. Dranikov and A. M. Fridman

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 404, issue 1, pages 415-432
Published in print May 2010 | ISSN: 0035-8711
Published online April 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16301.x
Wave angular momentum and the evolution of planetary rings

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A theory is proposed that provides angular momentum conservation through the acoustic drift mechanism for gap and ringlet formation in planetary rings. In this context, a new variant of drift mechanism is found, which is dominant if the collision frequency is of the order of the orbital frequency or less. An angular pseudo-momentum equation is derived for gravitational acoustic waves with dissipation. An explicit expression for angular pseudo-momentum, taking into account vertical wave structure, is obtained. The relation between Eulerian- and Lagrangian-averaged mass fluxes is also derived, and the advantages of the Lagrangian one are emphasized.

Keywords: convection; hydrodynamics; line: formation; waves; planets and satellites: rings; planet–disc interactions

Journal Article.  7563 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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