Table 4
Ice mantles composition.
| Standard models | Observations | |||||
|---|---|---|---|---|---|---|
| Species | N2 | N3 | N4 | N5 | Elias 16(a) | W33A(a) |
| H2O | 100 | 100 | 100 | 100 | 100 | 100 |
| CO | 51 | 44 | 55 | 52 | 25 | 8 |
| CO2 | 29 | 49 | 25 | 27 | 18 | 13 |
| NH3 | 15 | 24 | 9 | 13 | ≤9 | 15 |
| CH4 | 3 | 4 | 1 | 2 | _ | 1.5 |
| H2CO | 0.07 | 0.3 | 0.02 | 0.05 | _ | 6 |
| CH3OH | 0.07 | 0.8 | 0.03 | 0.05 | <3 | 18 |
Notes. Abundancesof the main ice constituents, summed over all the ice layers formed at the end of the quasi-static contraction phase. These results are for the standard models and are given in percentage of the water ice value.
References.(a) Observational values from Gibb et al. (2000) and references therein.
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