Table 3 Column densities and column density ratios of water isotopologues

From: Pristine ices in a planet-forming disk revealed by heavy water

Method

N(D2O)

N(HDO)

N(H218O)

D2O/H2O

D2O/HDO

\(\frac{{{\mathbf{D}}}_{\mathbf{2}}{\mathbf{O}}/{\mathbf{HDO}}}{{{\mathbf{HDO}}/{\mathbf{H}}}_{\mathbf{2}}{{\mathbf{O}}}}\)

(1013 cm−2)

(1014 cm−2)

(1014 cm−2)

(×10−5)

(×10−3)

 

Keplerian mask

4.2 ± 1.2

49.5 ± 6.9

23.7 ± 5.7

3.2 ± 1.2

8.5 ± 2.8

2.3 ± 1.0

Shifted spectrum

4.9 ± 1.4

56.4 ± 7.7

32.3 ± 6.3

2.7 ± 1.0

8.6 ± 2.8

2.8 ± 1.1

  1. All uncertainties include the absolute flux calibration uncertainty of ALMA, the uncertainty on the assumed excitation temperature and the uncertainty on the 16O/18O ratio.
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