The dynamic mature of the Adams ring arcs - Fraternite, Egalite (2,1), Liberte, Courage

TL;DR

This paper models the dynamic behavior of the Adams ring arcs as a reaction to Lindblad resonances caused by the finite mass of Fraternite, explaining the formation and movement of minor arcs without external resonance constraints.

Contribution

It introduces a dynamic model where the arcs are self-generated through Lindblad resonances, differing from previous models relying on external corotation resonances.

Findings

Locations of test bodies match observed arc positions.

Arc dynamics are explained by resonance reactions, not fixed resonances.

The model accounts for time-dependent arc configurations.

Abstract

By considering the finite mass of Fraternite, the dynamic nature of the Adams ring arcs is regarded as caused by the reaction of a test body (a minor arc) through the Lindblad resonance (LR). Assumming the eccentricity of the test body is larger than that of Galatea, this generates several locations along the ring in the neighborhood of Fraternite where the time averaged force on a test body vanishes. These locations appear to correspond to the time dependent configuration of Egalite (2,1), Liberte, and Courage, and seem to be able to account for the dynamics of the arcs. Such a configuration is a dynamic one because the minor arcs are not bounded by the corotation eccentricity resonance (CER) externally imposed by Galatea, but are self-generated by LR reacting to the external fields.