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Table 4
Ice ratios in comets compared to our results at two different epochs.
| Ratio | Cometary | c_cb: [C/O] = 0.45 | c_cc: [C/O] = 0.16 | |
| measurementsa | 106 yr | 107 yr | 107 yr | |
|
|
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| nCO2#/nCO# | <0.6 | 0.65 | 1 | 0.43 |
| nCO#/nH2O# | <0.2 | 0.6 | 0.45 | 0.14 |
| nCO2#/nH2O# | 0.02–0.12 | 0.39 | 0.6 | 0.06 |
| nCH4#/nH2O# | 0.003–0.015 | 0.001 | 0.06 | <0.001 |
Notes.
(a)
Abundances compiled from cometary measurements in Bockelée-Morvan et al. (2004); Bockelée-Morvan (2010).
(b)
Ratios from our chem_compact (c_c) model using a [C/O] ratio of 0.45 (see Fig. 3).
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