Table 5
Fit(Y/N) to current H2O, CO, and CO2 observations with models developed in this work.
| H2O | CO | CO2 | |
|---|---|---|---|
| Steady sourcea | Y | Y | Y |
| 6.0 × 104 cm−2 s−1 | 2.7 × 105 cm−2 s−1 | 4.5 × 103 cm−2 s−1 | |
| Cometary impactb | N | Y | N |
| (D, timpact) | (2 km, 629 yr)c | ||
| Combined sourcec | Y | Y | N |
| Influx | 6.0 × 104 cm−2 s−1 | (2 km, 629 yr)c | |
| Y | Y | Y | |
| Influx / (D, timpact) | 6.0 × 104 cm−2 s−1 | (2 km, 629 yr)c | 4.5 × 103 cm−2 s−1 |
| Influx | 6.0 × 104 cm−2 s−1 | (2.45 × 104 cm−2 s−1)d | 4.5 × 103 cm−2 s−1 |
 |
(2 km, 639 yr)d | ||
Notes. (a) Steady source due to ice grain ablation with integrated fluxes as indicated. (b) Cometary impact delivering CO and H2O. (c) Impactor size and time of the event listed in Table 4 as case 3. We note the degeneracy in (D, t) for the cometary impact cases in Table 4. (d)Scenarios in which theoxygen is supplied both by a cometary impact and by ice grain ablation.
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