Condensation temperatures and volume mixing ratios of the chemical species.
|Species (Y)||Tcond [K]||vY, no C||vY, w C|
|CO||20||0.45 × C/H||0.45 × C/H|
|CH4||30||0.45 × C/H||0.25 × C/H|
|CO2||70||0.1 × C/H||0.1 × C/H|
|H2O||170||O/H - (3 × MgSiO3/H + 4 × Mg2SiO4/H + CO/H|
|+ 2 × CO2/H + 3 × Fe2O3/H + 4 × Fe3O4/H)||see vY, no C|
|Fe3O4||371||(1/6) × (Fe/H - S/H)||(1/6) × (Fe/H - S/H)|
|C (carbon grains)||626||0||0.2 × C/H|
|Mg2SiO4||1354||Mg/H - Si/H||Mg/H - Si/H|
|Fe2O3||1357||0.25 × (Fe/H - S/H)||0.25 × (Fe/H - S/H)|
|MgSiO3||1500||Mg/H - 2 × (Mg/H - Si/H)||Mg/H - 2 × (Mg/H - Si/H)|
Notes. Condensation temperatures for molecules are taken from Lodders (2003). For Fe2 O3 the condensation temperature for pure iron is adopted (Lodders 2003). Volume mixing ratios vY (i.e. by number) are adopted for the species as a function of disc elemental abundances (see e.g. Madhusudhan et al. 2014). We note that the Mgabundance is always larger than the Si abundance. We follow here the different mixing ratios from Bitsch & Battistini (2020).
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