Open Access
Table 1
Abundances n(X)/n(H) for different molecules X of interest.
| Species | Abundance | Mass fraction ƒm | Initial phase |
|---|---|---|---|
| H2 | 0.5 | 0.7 | non-condensable gas |
| He | 0.11 | 0.3 | non-condensable gas |
| CO | 8.9 × 10−6 | 1.75 × 10−4 | non-condensable gas |
| CH4 | 8.9 × 10−6 | 10−4 | ice-rich pebbles |
Notes. Similar values are used in recent modeling (e.g., Bosman et al. 2021a; Schneider & Bitsch 2021), and are consistent with cometary ices in forming protoplanetary disk midplanes (Drozdovskaya et al. 2016).
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