Constraints on the initial mass, age and lifetime of Saturn's rings from viscous evolutions that include pollution and transport due to micrometeoroid bombardment
arXiv:2305.13609 · doi:10.1016/j.icarus.2022.115296
Abstract
The Cassini spacecraft provided key measurements during its more than twelve year mission that constrain the absolute age of Saturn's rings. These include the extrinsic micrometeoroid flux at Saturn, the volume fraction of non-icy pollutants in the rings, and a measurement of the ring mass. These observations taken together limit the ring exposure age to be < a few 100 Myr if the flux was persistent over that time (Kempf et al., 2023). In addition, Cassini observations during the Grand Finale further indicate the rings are losing mass (Hsu et al., 2018; Waite et al., 2018) suggesting the rings are ephemeral as well. In a companion paper (Durisen and Estrada, 2023), we show that the effects of micrometeoroid bombardment and ballistic transport of their impact ejecta can account for these loss rates for reasonable parameter choices. In this paper, we conduct numerical simulations of an evolving ring in a systematic way in order to determine initial conditions that are consistent with these observations.
31 pages, 19 figures, 2 tables, Published in Icarus
References in corpus (7)
- Formation of Regular Satellites from Ancient Massive Rings in the Solar System
- Resonance locking in giant planets indicated by the rapid orbital expansion of Titan
- Survival of icy grains in debris discs. The role of photosputtering
- Long-term & large-scale viscous evolution of dense planetary rings
- Connections between Spectra and Structure in Saturn's Main Rings Based on Cassini VIMS Data
- A recent impact origin of Saturn's rings and mid-sized moons
- Large mass inflow rates in Saturn's rings due to ballistic transport and mass loading