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Table 1
Modeling parameters, following Woitke et al. (2009).
| Parameter | Symbol | Value |
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| Disk mass | MD | 0.01 M⊙ |
| Dust-to-gas mass ratio | ρd/ρg | 0.01 |
| Minimum dust grain size | amin | 0.1 μm |
| Maximum dust grain size | amax | 10 μm |
| Grain size power-law index | p | 3.5 |
| Grain material mass density | ρgmd | 2.5 g cm-3 |
| Grain mass density | ρd | 2.16 × 10-26n ⟨ H ⟩ g |
| Grain number density | ndust | 4.6 × 10-14n ⟨ H ⟩ |
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| Local UV field strength | χ | 10-3 |
| Dust opacity (UV, 100 nm) | κUV | 6.8 × 103 cm2 g-1 |
| Cosmic ray ionization rate (H2) | ζH2 | 5 × 10-17 s-1 |
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| Adsorption site area | Asite | 6.67 × 10-16 cm2 |
| Number of active layers | NLay | 2 |
| Grain CR “duty-cycle” | f(70 K) | 3.16 × 10-19 |
| Grain albedo at 150 nm | ω | 0.57 |
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| CO photodesorption yield | Yi (CO#) | 2.7 × 10-3 |
| H2O photodesorption yield | Yi (H2O#) | 1.3 × 10-3 |
| CH4 photodesorption yield | Yi (CH4#) | 10-3 |
| CO2 photodesorption yield | Yi (CO2#) | 10-3 |
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| CO adsorption energy |  (CO#) |
960 K |
| H2O adsorption energy | (H2O#) |
4800 K |
| CH4 adsorption energy | (CH4#) |
1100 K |
| CO2 adsorption energy | (CO2#) |
2000 K |
Notes. The symbol # identifies an ice-phase species.
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