Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.404..415d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 404, Issue 1, pp. 415-432.
Astronomy and Astrophysics
Astronomy
Convection, Hydrodynamics, Line: Formation, Waves, Planets And Satellites: Rings, Planet-Disc Interactions
Scientific paper
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.
Dranikov I. L.
Fridman Alexei M.
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