Table 2
LTE slab model best-fit parameters.
| Species | N (cm−2) | [N/N H2] (a) | T (K) | R (au) | 𝒩 (mol.) |
|---|---|---|---|---|---|
| source A+B | |||||
| 12CO2 |  (17) |
 (−7) |
 (2) |
 (2) |
3.7 (48) |
| 13CO2 (b) | <1.2 (16) | <1.4 (−8) | – | – | 2.6 (47) |
| C2H2 |  (16) |
 (−8) |
 (2) |
 (1) |
1.0 (46) |
| 13CCH2 (c) | <8.5 (15) | <1.0 (−8) | – | – | 1.1 (45) |
| HCN | <2.7 (19) | <3 1 (−5) | <1 0 (2) | >4.0 (2) | 2.4 (49) |
| OH (d) | <7.9 (17) | <9.4 (−7) |  (3) |
>2.0(0) | 4.0 (44) |
| source A | |||||
| CO (e) | <5 6(18) | <6.3 (−6) |  (3) |
>8.8 (−2) | 4.7 (42) |
| source B | |||||
| H2O (f) |  (18) |
 (−5) |
 (2) |
– | – |
| source S1 | |||||
| CO (e) | <5.4 (17) | <5.4 (−7) |  (3) |
>2.2 (−1) | 1.1 (43) |
| OH | <3.8(18) | <3.8 (−6) |  (3) |
>1.2 (0) | 1.4 (45) |
Notes. All numbers are written in the format a (b) = a × 10b, with 1 sigma confidence intervals where appropriate. (a)See discussion of uncertainties and caveats on the column density ratios in Sects. 3.2 and 4.6. (b)Fitting performed with T and R fixed to best-fit values for 12CO2. (c)Fitting performed with T and R fixed to best-fit values for C2H2.(d)Highly non-LTE behaviour likely, see Sect. 4.5. (e)Best-fit temperature can be overestimated, see Sect. 4.4. (f)Seen in absorption.
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