Table 2
HDO/H2O, D2O/HDO, and D2O/H2O abundance ratios estimated towards the protostar IRAS 16293.
| Hot corino | Outer envelope | Photodesorption layer | |||
|
|
|||||
| Best-fit | 3σ | Best-fit | 3σ | AV ~ 1–4 mag | |
|
|
|||||
| HDOa | 1.8 × 10-7 | 1.4–2.4 × 10-7 | 8 × 10-11 | 5.5–10.6 × 10-11 | ~0.6–2.4 × 10-8 |
| H2Oa,b | 1 × 10-5 | 4.7–40.0 × 10-6 | 1.5 × 10-8 | 7.0–22.5 × 10-9 | ~1.3–5.3 × 10-7 |
| D2O | 7 × 10-10 | ≤1.3 × 10-9 | 5 × 10-12 | ≤1.3 × 10-11 | ~6.6–27 × 10-10 |
| HDO/H2O | 1.8% | 0.4%–5.1% | 0.5% | 0.3%–1.5% | ~4.8%c |
| D2O/HDO | 0.4% | ≤0.9% | 6.3% | ≤23% | ~10.8%c |
| D2O/H2O | 0.007% | ≤0.03% | 0.03% | ≤0.2% | ~0.5%c |
Notes.
The HDO and H2O abundances from Coutens et al. (2012) were recalculated with the χ2 minimization shown in Eq. (1).
The H2O abundances are obtained from the
H
O
data using the collision rates with H2 calculated by Daniel et al. (2011). The
H
O/HO
ratio is assumed to be 500.
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