Table 2
O-bearing neutral and non-radical organic molecules containing four or more atoms identified in the ISM compared to the findings of this work, including the level-of-confidence indicator (LCI) of our identifications.
| Molecule | Constitution formula | Mass (Da) | Reference | Presence in 67P (LCI) |
|---|---|---|---|---|
| Formaldehyde | H2CO | 30 | McGuire (2022) | Yes (3) |
| Methanol | CH3OH | 32 | McGuire (2022) | Yes (3) |
| Ketene | H2CCO | 42 | McGuire (2022) | Yes (3) |
| Acetaldehyde | CH3CHO | 44 | McGuire (2022) | Yes (3) |
| Ethylene oxide | c-C2H4O | 44 | McGuire (2022) | Maybe (a) |
| Vinyl alcohol | CH2CHOH | 44 | McGuire (2022) | (b) |
| Formic acid | HCOOH | 46 | McGuire (2022) | Yes (3) |
| Dimethyl ether | CH3OCH3 | 46 | McGuire (2022) | Yes (3) |
| Ethanol | CH3CH2OH | 46 | McGuire (2022) | Yes (3) |
| Propynal | HC2CHO | 54 | McGuire (2022) | Yes (2) |
| Cyclopropenone | c-H2C3O | 54 | McGuire (2022) | (b) |
| Propenal | CH2CHCHO | 56 | McGuire (2022) | Yes (2) |
| 1-propen-1-on | CH3CHCO | 56 | Fuentetaja et al. (2023) | (b) |
| Acetone | CH3COCH3 | 58 | McGuire (2022) | Yes (3) |
| Propanal | CH3CHCH2O | 58 | McGuire (2022) | Yes (3) |
| Propylene oxide | CH3CH2OH | 58 | McGuire (2022) | Maybe (a) |
| Isopropanol | i-C3H7OH | 60 | Belloche et al. (2022) | Yes (2) |
| n-Propanol | n-C3H7OH | 60 | Belloche et al. (2022) | Yes (3) |
| Methyl formate | HCOOCH3 | 60 | McGuire (2022) | Yes (3) |
| Acetic acid | CH3COOH | 60 | McGuire (2022) | Yes (3) |
| Glycolaldehyde | CH2OHCHO | 60 | McGuire (2022) | Yes (3) |
| Z-1,2-ethenediol | HOCHCHOH | 60 | Rivilla et al. (2022) | (b) |
| Ethylene glycol | HOCH2CH2OH | 62 | McGuire (2022) | Yes (3) |
| 3-hydroxypropenal(c) | OHCHCHCHO | 72 | Coutens et al. (2022) | (b) |
| Ethyl formate | C2H5OCHO | 74 | McGuire (2022) | Maybe (c) |
| Methyl acetate | CH3COOCH3 | 74 | McGuire (2022) | Maybe (d) |
| Hydroxyacetone | CH3COCH2OH | 74 | McGuire (2022) | Maybe (d) |
Notes. Original literature for the ISM species can be found in the 2021 census of McGuire (2022), and only more recent detections are referenced specifically. Disputed detections were not considered. (a)May or may not be present at the expense of the structural isomer(s). (b)No reference data available from NIST.(c)Identification tentative. (d)Molecule may or may not be present with low relative abundance, but the fragmentation pattern does not show any significant M or M-H signals for a clear identification.
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