Table 3
Best-fitting column densities, excitation temperatures, and D/H ratios (with statistical correction) of CHD2OH toward IRAS 16293-2422 B and A.
| Best-fitting parameters | I16293B | I16293A |
|---|---|---|
| Tex (K) | 90.0 ± 9 | 127 ± 13 |
| N (cm−2) | (1.78 ± 0.36) × 1017 | (2.22 ± 0.44) × 1017 |
| D/H of CH3OH (w/ stat. corr.) | (7.7 ± 1.2) × 10−2 | (7.5 ± 1.1) × 10−2 |
| N (cm−2) at Tex = 150 K | (1.07 ± 0.21) × 1017 | ⋯ |
| D/H of CH3OH (w/ stat. corr.) | (6.0 ± 0.9) × 10−2 | ⋯ |
| N (cm−2) at Tex = 300 K | (6.62 ± 1.32) × 1016 | ⋯ |
| D/H of CH3OH (w/ stat. corr.) | (4.7 ± 0.7) × 10−2 | ⋯ |
| N(CH3OH) (cm−2) | (1.0 ± 0.2) × 1019 | (1.3 ± 0.4) × 1019 |
| Reference | Jørgensen et al. (2018) | Manigand et al. (2020) |
Notes. Top two rows are the best-fitting column density and excitation temperature of CHD2OH obtained during simultaneous fitting of these two parameters. The associated D/H ratio with statistical correction is in the third row (Appendix C). The cases of constant Tex = 150 and 300 K have also been computed with the corresponding derived column densities and D/H ratios in rows four and five, and six and seven, respectively.The second column contains the values for the one-beam offset position in the SW direction from IRAS 16293-2422 B (0.5′′ or 70 au away from the dust peak of B). The third column contains the values for the one-beam offset position in the NE direction from IRAS 16293-2422 A (0.6′′ or 85 au away from the dust peak of A). The last two rows give the methanol column densities adopted for the calculations of D/H ratios and the corresponding references. The stated errors on N and Tex are assumed 20% and 10% errors, respectively. The errors derived with the MCMC routine in this work are much smaller, refer to Sects. 2.3 and 3.1 for a discussion about that. For N(CH3OH) in I16293A, the error is 30% as derived in Manigand et al. (2020).
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