Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, EpiSciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation
Journal articles

Cassini INMS constraints on the composition and latitudinal fractionation of Saturn ring rain material

Abstract : During Cassini's Grand Finale, the spacecraft flew between Saturn's upper atmosphere and its innermost ring, the D ring. Throughout these final orbits, Cassini encountered material flowing from the D ring into Saturn's atmosphere. Here, we present a compositional analysis of this material using data collected by Cassini's Ion Neutral Mass Spectrometer. We confirm the identification of CH4, CO2, CO, N2, H2O, NH3, and organics in the ring material, and provide upper limits for organic compounds of interest. The H/C, O/C, N/C, and S/C ratios of ring material are constrained using three different kinds of model spectra: automated fits, hand fits of inorganics + hydrocarbons, and hand fits of inorganics + organics with priority given to O-, N-, and S-bearing organics. Additionally, we compare data from the final plunge to earlier orbits, and find that ring material can be divided into gas and dust constituents, with CO2 at the volatility boundary between the two phases. At increasing distance above the equatorial plane, the gas/dust molar ratio increases.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03667121
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Friday, May 13, 2022 - 10:09:02 AM
Last modification on : Saturday, June 25, 2022 - 3:17:10 AM

Identifiers

Collections

Citation

K. E. Miller, J. H. Waite, R. S. Perryman, M. E. Perry, A. Bouquet, et al.. Cassini INMS constraints on the composition and latitudinal fractionation of Saturn ring rain material. Icarus, 2020, 339, ⟨10.1016/j.icarus.2019.113595⟩. ⟨insu-03667121⟩

Share

Metrics

Record views

4