Table 2
Comparison of theoretical results with available observations versus the integrated flux of oxygen due to ice grain ablation.
| H2O | ||||
|---|---|---|---|---|
| ISOa | Φ | q | Column | |
| q, cm−2 | cm−2 s−1 | at 0.03 mbar | cm−2 | |
| 4.0 × 10−9, (5 − 12) × 1013 | ||||
| TW18 | 6.0 × 104 | 4.4 × 10−9 | 4.3 × 1013 | |
| MP17b | 1.2 × 105 | 7.9 × 10−9 | 1.3 × 1014 | |
| CO2 | ||||
| Spitzer | Φ | q | Column | |
| q, cm−2 | cm−2 s−1 | at 0.15 mbar | cm−2 | |
| 8.0 × 10−11c, 1.7 ± 0.2 × 1013 | ||||
| TW18 | 4.5 × 103 | 8.3 × 10−11 | 9.6 × 1012 | |
| MP17b | 3.0 × 103 | 6.0 × 10−11 | 6.9 × 1012 | |
Notes. (a) Mixing ratio at 0.03 mbar and column density in cm−2 by Feuchtgruber et al. (1997). (b)Our model run with the CO, H2O, and CO2 integrated flux as in Moses & Poppe (2017). (c)Best-fit mixing ratioat 0.15 mbar from photochemical modelling in Orton et al. (2014b).
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