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Table 4
Species included in our model ordered by volatility, with their binding energies Ebind , desorption prefactors ν, and abundances with respect to H.
| Species | Ebind (K) | v (s−1) | Initial abundance |
|---|---|---|---|
| Si-grains | – | – | Si/H = 3.2 × 10−5 |
| C-grains | – | – | 0.39 × C/H = 9.0 × 10−5 |
| H2O | 6722(a) | 1.3 × 1018 | 0.2 × O/H = 1.1 × 10−4 |
| CH3OH | 4850 (b) | 5.0 × 1014 | 0.01 × C/H = 2.3 × 10−6 |
| CO2 | 2980 (c) | 1.1 × 1015(e) | 0.09 × C/H = 2.1 × 10−5 |
| CH4 | 1190 (d) | 2.5 × 1014 | 0.01 × C/H = 2.3 × 10−6 |
| O2 | 1030 (d) | 1.3 × 1014 | 0.16 × O/H = 0.85 × 10−4 |
| CO | 910 (d) | 4.1 × 1013 | 0.50 × C/H = 1.2 × 10−4 |
Notes. (a)Smith et al. (2011), (b)Doronin et al. (2015), (c)Edridge et al. (2013),(d)Smith et al. (2016),(e) Assuming 1 × 1015 mol cm−2.
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