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Table 2
Abundance and D/H ratio of methyl formate and formaldehyde isotopologues observed towards IRAS 16293A and B and in the model used in the discussion.
| IRAS 16293A | IRAS 16293B | |||
|---|---|---|---|---|
| Species | Ntot ratios (× 10−2) | D/H ratio (×10−2) | Ntot ratios (×10−2) | D/H ratio (×10−2) |
| CH2 DOCHO/CH3 OCHO | 8.5 ± 3.6 | 2.8 ± 0.4 | 18 ± 2.7a | 6.1 ± 0.3a |
| CH3 OCDO/CH3 OCHO | 1.7 ± 0.7 | 1.7 ± 0.7 | 5.7 ± 0.9a | 5.7 ± 0.9a |
| CHD2 OCHO/CH3 OCHO | 2.0 ± 0.8 | 8.2 ± 0.6 | 4.2 ± 0.6 | 12.0 ± 0.3 |
| HDCO/H2 CO | – | – | 6.8 ± 1.2b | 3.3 ± 1.0b |
| D2 CO/H2 CO | – | – | 0.9 ± 0.2b | 9.2 ± 1.0b |
| modelc “early time” | modelc “late time” | |||
| Species | Ntot ratios (× 10−2) | D/H ratio (×10−2) | Ntot ratios (×10−2) | D/H ratio (×10−2) |
| CH2 DOCHO/CH3 OCHO | 21 | 7.0 | 0.65 | 0.22 |
| CH3 OCDO/CH3 OCHO | 9.2 | 9.2 | 0.0025 | 0.0025 |
| CHD2 OCHO/CH3 OCHO | 2.4d | 8.9d | 0.0016d | 0.19d |
| HDCO/H2 CO | 4.1 | 2.1 | 0.42 | 0.21 |
| D2 CO/H2 CO | 0.18 | 2.4 | 0.00064 | 0.15 |
References. (a) Jørgensen et al. (2018); (b)Persson et al. (2018); (c)Taquet et al. (2014); (d)V. Taquet, priv. comm.
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