Table 4.
Detection status of H I lines observed towards our newly identified protostars.
| H I 9–6 | H I 6–5 | H I 8–6 | H I 10–7 | H I 13–8 | H I 7–6 | H I 8–7 | H I 9–8 | |
|---|---|---|---|---|---|---|---|---|
| λ [ μm ] | 5.908 | 7.460 | 7.502 | 8.760 | 9.392 | 12.372 | 19.062 | 27.803 |
| G28 IRS2 | ✗ | ✗ E | ✓ ✓ | ✗ | ✗ | ✓ ✓ | ✗ E | ✗ |
| G28P1 A | ✗ | ✓ | ✗ | ✗ E | ✗ | ✓ E | ✓ | ✗ |
| G28P1 B | ✗ | ✗ | ✓ | ✓!! | ✗ | ✓ E | ✗ | ✗ |
| IRAS23385 A | ✗ | ✓ | ✓✓ E | ✗ | ✗ | ✓⋆ | ✗ | ✗ |
| G28S | ✗ | E | ✗ | ✗ | ✗ | E | ✗ | A |
| G31 | ✗ | O | ✗ | ✗ | ✗ | O | O | ✗ |
| IRAS18089 A | – | – | – | ✗ | – | ✗ | – | – |
| IRAS18089 mm | – | ✓ ✓† | – | ✗ | ✗ | ✗ | A | – |
| IRAS18089 C | ✗ | ✗ | ✗ E | ✓!! | ✗ | ✗ | ✗ | ✗ |
| Lacc cal. ref. | 3 | 3 | 3 | 2, 3 | 3 | 1, 2, 3 | 2 | white − |
Notes. The last row marks the lines whose calibration was used in this work to quantify accretion parameters with green cells. Symbology: ✓ Line detected at protostar with 3< S/N < 5; ✓✓ Detected at protostar with S/N ≥ 5; ‘E’ detected diffuse at environment − ✗ not detected at protostar; ‘O’ detected due to outflow; ‘A’ in absorption with S/N > 3; ‘⋆’ S/N of 2.5 (lower than reported in Beuther et al. 2023); † likely hyper-compact H II region; ‘–’ undetermined (see Sect. B.2); !! Dubious detection (Appendix A) Lacc calibration references. 1: Rigliaco et al. (2015); 2: Tofflemire et al. (2025); 3: Shridharan et al. (2026).
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