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Table 6

Parameters allowing the calculation of the ice and clathrate line position rice(x) (AU) for each volatile molecule x (see Eq. (16)) in non-irradiated discs.

Molecules ν(Tc) μ(Tc) Tc* (K)

Pure ices
H2O 38.65 ± 0.21 0.582 ± 0.002 160
CH3OH 35.34 ± 0.21 0.587 ± 0.002 134
NH3 28.93 ± 0.19 0.585 ± 0.002 93
CO2 26.81 ± 0.19 0.584 ± 0.002 81
H2S 24.58 ± 0.19 0.582 ± 0.002 70
CH4 13.30 ± 0.18 0.555 ± 0.0023 33
CO 11.96 ± 0.18 0.55 ± 0.003 29
N2 8.846 ± 0.179 0.54 ± 0.0036 23

Clathrates
H2S–6 H2O 27.21 ± 0.19 0.582 ± 0.002 84
CH4–6 H2O 22.37 ± 0.19 0.579 ± 0.0022 61
CO–6 H2O 20.47 ± 0.18 0.576 ± 0.0023 53
N2–6 H2O 18.59 ± 0.18 0.572 ± 0.0024 47

Notes.

(*)

Temperature of condensation or clathrate formation of volatile molecules at 1 AU.

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