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CO 2  ice is present on the trailing hemisphere of Ariel but is mostly absent from its leading hemisphere. The leading/trailing hemispherical asymmetry in the distribution of CO 2  ice is consistent with radiolytic production of CO 2 , formed by charged particle bombardment of H 2 O ice and carbonaceous material in Ariel’s regolith. This longitudinal distribution of CO 2  on Ariel was previously characterized using 13 near-infrared reflectance spectra collected at “low” sub-observer latitudes between 30°S and 30°N. Here we investigated the distribution of CO 2  ice on Ariel using 18 new spectra: 2 collected over low sub-observer latitudes, 5 collected at “mid” sub-observer latitudes (31°N–44°N), and 11 collected over “high” sub-observer latitudes (45°N–51°N). Analysis of these data indicates that CO 2  ice is primarily concentrated on Ariel’s trailing hemisphere. However, CO 2  ice band strengths are diminished in the spectra collected over mid and high sub-observer latitudes. This sub-observer latitudinal trend may result from radiolytic production of CO 2  molecules at high latitudes and subsequent migration of this constituent to low-latitude cold traps. We detected a subtle feature near 2.13  μ m in two spectra collected over high sub-observer latitudes, which might result from a “forbidden” transition mode of CO 2  ice that is substantially stronger in well-mixed substrates composed of CO 2  and H 2 O ice, consistent with regolith-mixed CO 2  ice grains formed by radiolysis. Additionally, we detected a 2.35  μ m feature in some low sub-observer latitude spectra, which might result from CO formed as part of a CO 2  radiolytic production cycle.

A CO2 Cycle on Ariel? Radiolytic Production and Migration to Low-latitude Cold Traps

A CO₂ Cycle on Ariel? Radiolytic Production and Migration to Low-latitude Cold Traps