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Table 1
New observations of TW Hya and HD 100546 with APEX.
| Transition | ν |
|
|
| (GHz) | (K km s-1) | ||
|
|
|||
| TW Hya | HD 100546 | ||
|
|
|||
| [C i] 1–0 | 492.161 | 0.05 ± 0.01 | 0.49 ± 0.05 |
| CO 6–5 | 691.473 | 1.0 ± 0.1 | 6.4 ± 0.1 |
C2H  |
349.338 | 0.15 ± 0.05 | ≤0.03 |
C2H  |
349.339 | 0.12 ± 0.05 | ≤0.03 |
C2H  |
349.399 | 0.13 ± 0.05 | ≤0.03 |
C2H  |
349.401 | 0.10 ± 0.05 | ≤0.03 |
| HCO+ 4–3 | 356.734 | 0.43 ± 0.01 | 0.14 ± 0.02 |
Notes. Uncertainties are at 1σ and upper limits at 3σ confidence. The quantum numbers for C2H are N,J,F.
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