Table 1
Initial abundances for nine key volatile species, for both radii of drift origin (128 AU and 200 AU).
| Molecule | Initial abundance, wrt H | Ebind (K) | Radius for final abundance (AU) | |
|---|---|---|---|---|
| 128 AU | 200 AU | |||
| H2O | 2.99E-04 | 3.00E-04 | 5770 | 4.8 |
| CH3OH | 4.09E-05 | 4.37E-05 | 4930 | 4.8 |
| SO2 | 1.23E-09 | 4.54E-11 | 5330 | 4.8 |
| CO2 | 6.34E-05 | 6.00E-05 | 2990 | 18.2 |
| NH3 | 2.05E-05 | 2.11E-05 | 3130 | 18.2 |
| HCN | 2.70E-07 | 3.48E-07 | 3610 | 18.2 |
| H2S | 2.68E-06 | 2.67E-06 | 2743 | 18.9 |
| SO | 4.64E-08 | 1.47E-09 | 2600 | 18.9 |
| S2 | 3.17E-12 | 4.89E-11 | 2200 | 31 |
| CH4 | 1.37E-05 | 1.83E-05 | 1090 | − |
| CO | − | 2.21E-05 | 855 | − |
Notes. Fourth column indicates (for reference) the molecular binding energies used for each molecule in the chemical code. Fifth column indicates the radii (outside the iceline radius of a given species) at which the final abundances of these species are evaluated. This set of abundances is not the complete set of species with non-zero initial abundances, but merely the most abundant ice species at the onset of modelling. CO ice is not tracked, but its initial abundance at 200 AU (19.5 K) is shown, for comparison. The binding energies are adopted from the umist rate 12 (McElroy et al. 2013), as described in Walsh et al. (2015).
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