Numerical analysis of processes for the formation of moonlets confining the arcs of Neptune
arXiv:2204.01063 · doi:10.1093/mnras/stac944
Abstract
The arcs of Neptune - Fraternité, Egalité, Liberté, and Courage - are four incomplete rings immersed in the Adams ring. A recent confinement model for the arcs proposes that the structures are azimuthally confined by four co-orbital moonlets. In this work, we intend to approach some points related to the dynamics of co-orbital moonlets and suggest a model for their formation. We study the equilibrium configurations for 1+N co-orbital satellites under the 42:43 Lindblad resonance with Galatea. We obtained three distinct configurations with 1+3 and 1+4 moonlets able to confine and reproduce the location of the arcs. The moonlets' formation is analysed by the disruption of an ancient body at a Lagrangian point of a moon. The disruption fragments spread out in horseshoe orbits and collide to form moonlets, which reach an equilibrium configuration due to a non-conservative effect. In such a scenario, the arcs likely formed through a mixture of different processes, with impacts between disruption outcomes and meteoroid impacts with the moonlets being possibilities.
Accepted for publication in Monthly Notices of the Royal Astronomical Society Main Journal (MNRAS)
References in corpus (7)
- Formation of bi-lobed shapes by sub-catastrophic collisions: A late origin of comet 67P/C-G's structure
- Building the Galilean moons system via pebble accretion and migration: A primordial resonant chain
- The rings of Neptune
- Effects of immersed moonlets in the ring arc particles of Saturn
- Neptune's ring arcs confined by coorbital satellites: dust orbital evolution through solar radiation
- Analysing the region of the rings and small satellites of Neptune
- Modeling Saturn's D68 clumps as a co-orbital satellite system