Table 1
Condensation temperatures and volume mixing ratios of the chemical species.
| Species (Y) | Tcond (K) | vY |
|---|---|---|
| CO | 20 | 0.45 × C/H (0.9 × C/H for T < 70 K) |
| CH4 | 30 | 0.45 × C/H (0 for T > 70 K) |
| CO2 | 70 | 0.1 × C/H |
| NH3 | 90(a) | N/H |
| H2O | 150 | O/H - (3 × MgSiO3/H + 4 × Mg2SiO4/H + CO/H |
| + 2 × CO2/H + 3 × Fe2O3/H + 4 × Fe3O4/H) | ||
| Fe3O4 | 371 | (1/6) × (Fe/H–S/H) |
| C (carbon grains) | 500 | 0 |
| FeS | 704 | S/H |
| Mg2SiO4 | 1354 | 0.75 × Si/H |
| Fe2O3 | 1357(b) | 0.25 × (Fe/H–S/H) |
| MgSiO3 | 1500 | 0.25 × Si/H |
Notes.Condensation temperatures for molecules from Lodders (2003). (a) Condensation temperature for NH3 from Thiabaud et al. (2015). (b)For Fe2 O3 the condensation temperature for pure iron is adopted (Lodders 2003). Volume mixing ratios vY (i.e. by number) adopted for the species as a function of disc elemental abundances (see e.g. Madhusudhan et al. 2014).
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