Table 1
Best-fit results of all the detected and tentatively detected species towards IRAS 16293 A.
| Species | #lines | Eup range | Trot | Ntot | Ntot/ Ntot/Nmain |
Isotopic ratio (a) | |
|---|---|---|---|---|---|---|---|
| (K) | (K) | (cm−2) | |||||
| CH3OH | 18 | 61−1201 | 130 ± 26 | 1.3 ± 0.4 × 1019 | |||
CH OH |
7 | 35−338 | 130 ± 26(b) | 2.3 ± 0.6 × 1016 | 1.8 ± 0.8 × 10−3 | 565 ± 237 | |
| 13CH3OH | 8 | 329−653 | 130 ± 26(c) | 2.0 ± 0.7 × 1017 | 1.5 ± 0.6 × 10−2 | 65 ± 27 | |
| CH2DOH | 24 | 61−896 | 130 ± 26 | 1.1 ± 0.3 × 1018 | 8.3 ± 3.6 × 10−2 | 2.8 ± 0.4 % | |
| CH3OD | 6 | 104−288 | 130 ± 26(d) | 2.8 ± 0.8 × 1017 | 2.2 ± 0.9 × 10−2 | 2.2 ± 0.9 % | |
| CH3OCHO (†) | 159 | 86−693 | 115 ± 23 | 2.7 ± 0.8 × 1017 | 2.1 ± 0.9 × 10−2 | ||
| CH3O13CHO | 6 | 255−308 | 115 ± 23(⋆) | 3.6 ± 1.1 × 1015 | 1.3 ± 0.5 × 10−2 | 75 ± 32 | |
| CH2DOCHO (†) | 82 | 62−417 | 115 ± 23 | 2.3 ± 0.7 × 1016 | 8.5 ± 3.6 × 10−2 | 2.8 ± 0.4 % | |
| CH3OCDO (†) | 3 | 282−369 | 115 ± 23 | 4.5 ± 1.3 × 1016 | 1.7 ± 0.7 × 10−2 | 1.7 ± 0.7 % | |
| CHD2OCHO (†) | 5 | 266−319 | 115 ± 23 | 5.3 ± 1.6 × 1015 | 2.0 ± 0.8 × 10−2 | 8.2 ± 0.6 % | |
| CH3OCH3 | 7 | 122−662 | 100 ± 20 | 5.2 ± 1.6 × 1017 | 4.0 ± 1.7 × 10−2 | ||
| CH3O13CH3 | 11 | 47−234 | 100 ± 20 | 1.2 ± 0.4 × 1016 | 2.3 ± 1.0 × 10−2 | 86 ± 18 | |
| s-CH2DOCH3 | 10 | 46−337 | 100 ± 20 | 2.4 ± 0.7 × 1016 | 4.6 ± 1.9 × 10−2 | 2.3 ± 0.5 % | |
| a-CH2DOCH3 | 20 | 68−243 | 100 ± 20(e) | 6.4 ± 2.0 × 1016 | 1.2 ± 0.5 × 10−1 | 3.1 ± 0.3 % | |
| H2CO | 2 | 173−(1542) | 155 ± 31(⋆) | 1.4 ± 0.4 × 1017 | 1.1 ± 0.5 × 10−2 | ||
| H2C18O | 3 | 97−279 | 155 ± 31(⋆) | 2.1 ± 1.0 × 1014 | 1.5 ± 0.6 × 10−3 | 667 ± 280 | |
H CO |
4 | 98−240 | 155 ± 31 | 1.5 ± 0.5 × 1015 | 1.1 ± 0.5 × 10−2 | 93 ± 39 | |
| H2C17O | 4 | 61−157 | 155 ± 31(⋆) | <6.0 × 1013 | <4.3 × 10−4 | > 2333 | |
| HDCO | 4 | 26−219 | 155 ± 31(⋆) | 6.9 ± 2.1 × 1015 | 4.9 ± 2.1 × 10−2 | 2.5 ± 0.5 % | |
| D2CO | 3 | 127−370 | 155 ± 31(⋆) | 5.8 ± 1.7 × 1015 | 4.1 ± 1.7 × 10−2 | 20.2 ± 4.2 % | |
| C2H5OH | 59 | 72−453 | 135 ± 27 | 8.0 ± 2.4 × 1016 | 6.1 ± 2.6 × 10−3 | ||
| CH3CHDOH (f) | 10 | 55−198 | 135 ± 27(g) | 7.0 ± 2.1 × 1015 | 8.8 ± 3.7 × 10−2 | 4.4 ± 0.9 % | |
| CH3CH2OD (f) | 9 | 48−192 | 135 ± 27(⋆) | <3.5 × 1015 | <4.4 × 10−2 | <4.4 % | |
| a-CH2DCH2OH (f) | 9 | 62−205 | 135 ± 27(⋆) | <3.5 × 1015 | <4.4 × 10−2 | <4.4 % | |
| s-CH2DCH2OH (f) | 7 | 48−199 | 135 ± 27(⋆) | <5.2 × 1015 | <6.5 × 10−2 | <3.3 % | |
| t-HCOOH | 8 | 35−530 | 90 ± 18 | 1.3 ± 0.4 × 1016 | 1.0 ± 0.4 × 10−3 | ||
| t-H13COOH | 6 | 141−160 | 90 ± 18(⋆) | <3.3 × 1014 | <2.5 × 10−2 | > 39 | |
| t-DCOOH | 7 | 147−225 | 90 ± 18(⋆) | <5.1 × 1014 | <3.9 × 10−2 | <3.9 % | |
| t-HCOOD | 6 | 131−208 | 90 ± 18(⋆) | <2.5 × 1014 | <1.9 × 10−2 | <1.9 % | |
| CH2 CO | 5 | 357− 996 | 135 ± 27 | 9.1 ± 2.7 × 1015 | 7.0 ± 2.9 × 10−4 | ||
| CHDCO | 8 | 161− 313 | 135 ± 27 (⋆) | <3.6 × 1014 | <4.0 × 10−2 | <2.0 % | |
| HNCO | 3 | 333− 794 | 180 ± 36 | 1.5 ± 0.5 × 1016 | 1.2 ± 0.5 × 10−3 | ||
| DNCO | 5 | 51− 366 | 180 ± 36 (⋆) | <2.5 × 1014 | <1.7 × 10−2 | <1.7 % | |
| CH3 CHO | 20 | 153− 385 | 140 ± 28 | 3.5 ± 1.1 × 1015 | 2.7 ± 1.1 × 10−4 | ||
| c-C2 H4 O | 7 | 43− 376 | 95 ± 19 | 6.9 ± 2.1 × 1015 | 5.3 ± 2.2 × 10−4 | ||
| CH3 COCH3 | 85 | 80− 322 | 125 ± 25 | 2.4 ± 0.7 × 1016 | 1.8 ± 0.8 × 10−3 | ||
| CH3 COOH | 17 | 129− 407 | 110 ± 22 | 4.5 ± 1.4 × 1015 | 3.5 ± 1.5 × 10−4 | ||
| CH2 (OH)CHO | 9 | 80− 323 | 155 ± 31 | 1.3 ± 0.4 × 1015 | 1.0 ± 0.4 × 10−4 | ||
| NH2 CHO | 8 | 151− 453 | 145 ± 29 | 1.9 ± 0.6 × 1015 | 1.5 ± 0.6 × 10−4 | ||
| aGg’-(CH2 OH)2 | 20 | 108− 363 | 145 ± 29 | 4.4 ± 1.3 × 1015 | 3.4 ± 1.4 × 10−4 | ||
| gGg’-(CH2 OH)2 | 12 | 97− 115 | 145 ± 29 (⋆) | <4.8 × 1015 | <3.7 × 10−4 | ||
| C2 H5 CHO | 3 | 297–330 | 120 ± 24 | <1.2 × 1015 | <9.2 × 10−5 | ||
Notes. (a) The D/H ratio, including statistics correction, is expressed in %, whereas other isotopic ratios correspond to 12 C/13C or 16 O/18O. (b) Trot converged to 105 K and Ntot = 2.2 ± 0.7 × 1016 cm−2. (c) Trot converged to 120 K and Ntot = 2.3 ± 0.7 × 1017 cm−2. (d) Trot converged to 105 K and Ntot = 3.4 ± 0.7 × 1017 cm−2. (e) Trot converged to 115 K and Ntot = 6.6 ± 2.0 × 1016 cm−2. (f) Abundances of C2 H5OH isotopologues were derived using the anti conformer entries and corrected to take the gauche conformer into account (see spectroscopic data section in Appendix C). (g) Trot converged to 125 K and Ntot = 6.6 ± 2.0 × 1015 cm−2. (b)−(e), (g)The rotational temperature of the main isotopologue was used to derive the column density, despite the convergence to a slightly different Trot. (⋆) The rotational temperature did not converge; the main isotopologue value is assumed.
References. (†) Manigand et al. (2019).
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