Table 7
Detected species (only the main isotopologues) in Class I protostars with IRAM-30 m surveys.
| Species | L1527 | SVS 13A | L1489 1RS | B5 IRS 1 | L1455 IRS 1 | L1551 IRS 5 (a) | L1551 IRS 5 (This work) | |
|---|---|---|---|---|---|---|---|---|
| CCH | Y | Y | Y | Y | Y | Y | Y | |
| C2H3CN | Y | N | – | – | – | – | N | |
| CCS | Y | Y | N | N | Y | Y | Y | |
| C3H | Y | N | h | h | h | h | Y | |
| c-C3H | Y | N | N | N | N | Y | Y | |
| c-C3H2 | Y | Y | Y | Y | Y | Y | Y | |
| l-C3H2 | Y | N | h | h | h | h | Y | |
| C3N | Y | N | h | h | h | h | Y | |
| C3O | Y | N | h | h | h | h | Y | |
| C3S | Y | Y | r | r | r | r | Y | |
| C4H | Y | Y | h | h | h | h | Y | |
| l-C4H2 | Y | N | h | h | h | h | Y | |
| C5H | Y | N | r | r | r | r | N | |
| C6H | Y | N | r | r | r | r | N | |
| CH3CCH | Y | Y | N | N | N | Y | Y | |
| CH3CHO | Y | Y | N | N | N | Y | Y | |
| CH3CN | Y | Y | N | N | N | Y | Y | |
| CH3OCH3 | Y | Y | – | – | – | – | Y | |
| CH3OCHO | Y | Y | N | N | N | Y | Y | |
| CH3OH | Y | Y | N | Y | Y | Y | Y | |
| CN | Y | Y | Y | Y | Y | Y | Y | |
| CO | Y | Y | Y | Y | Y | Y | Y | |
| CS | Y | Y | – | Y | Y | Y | Y | |
| HCCCHO | Y | N | N | N | N | N | N | |
| HC3N | Y | Y | h | h | h | h | Y | |
| HC5N | Y | Y | r | r | r | r | Y | |
| HCCNC | Y | Y | h | h | h | h | N | |
| HCN | Y | Y | Y | Y | Y | Y | Y | |
| HCNO | Y | N | h | h | h | h | N | |
| HCO | Y | Y | – | – | – | – | Y | |
| HCO+ | Y | Y | Y | Y | Y | Y | Y | |
| HCS+ | Y | Y | r | r | r | r | Y | |
| H2CO | Y | Y | Y | Y | Y | Y | Y | |
| H2CCN | Y | Y | h | h | h | h | N | |
| H2CCO | Y | N | N | N | N | Y | Y | |
| H2CS | Y | Y | N | Y | Y | Y | Y | |
| H2S | h | h | N | N | Y | Y | r | |
| HNC | Y | Y | r | r | r | r | Y | |
| HNCCC | Y | N | h | h | h | h | N | |
| HNCO | Y | Y | N | N | Y | Y | Y | |
| HNO | Y | N | r | r | r | r | Y | |
| HOCN | Y | N | h | h | h | h | Y | |
| HOCO+ | Y | N | h | h | h | h | Y | |
| HSCN | Y | N | h | h | h | h | N | |
| NH2CHO | N | Y | – | – | – | – | N | |
| NH3/NH2D | Y | Y | h | h | h | h | Y | |
| N2H+/N2D+ | Y | Y | N | Y | Y | Y | Y | |
| NS | – | – | r | r | r | r | Y | |
| OCS | Y | Y | N | N | Y | Y | Y | |
| SiO | N | Y | N | N | Y | N | N | |
| SO | Y | Y | Y | Y | Y | Y | Y | |
| SO2 | Y | Y | N | Y | Y | Y | Y | |
| Total | 48/50 | 33/50 | 7/23 | 12/24 | 17/24 | 23/25 | 41/52 | |
| Fraction | 96% | 66% | 30% | 50% | 71% | 92% | 72% | |
Notes. Data for L1527 and SVS 13A are taken from Lefloch et al. (2018) in the [80 – 116] GHz frequency range, and data for L1489 IRS, B5 1RS 1, L1455 1RS 1 and L1551 1RS 1 (with the superscript a) are taken from Mercimek et al. (2022) in the [214.5 – 238] GHz range. Bold-font letters stand for confirmed detections (Y) and non-detections (N). Dashes (–) stand for species that have not been reported. The letter r (as in “range”) indicates that the species that do not have transitions in the frequency ranges of the studies. The letter h (as in “hot”) indicates that the species have transitions within the frequency range of the studies but only with high Eup values (≥50 K) and they were not reported. The “total” line counts the number of Y over the number of Y+ N for each source.
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