Table 2
Best fit parameters acquired through the rotational diagram analysis for the iSHELL data.
| Molecule | Vibr. Trans. | ∆V(α) | FWHM | N | T | Rem | 𝒩(β) |
|---|---|---|---|---|---|---|---|
| (km s−1) | (km s−1) | (cm−2) | (K) | (au) | |||
| 12CO | υ = 1−0 (NC) | −1.2 | 11.6 | 3.2 × 1017 | 1000 | 0.46 | >4.6 × 1043 |
| υ = 1−0 (BC) | −1.2 | 33.5 | 6.3 × 1017 | 1725 | 0.38 | >6.3 × 1044 | |
| υ = 2−1 (NC) | −4.1 | 12.5 | 7.9 × 1017 | 1050 | 0.21 | >2.3 × 1043 | |
| υ = 2−1 (BC) | −0.5 | 35.8 | 5.0 × 1017 | 2175 | 0.22 | >1.6 × 1043 | |
| υ = 3−2 (NC) | −0.7 | 16.9 | 5.0 × 1018 | 1800 | 0.05 | >8.8 × 1042 | |
| υ = 3−2 (BC) | −1.0 | 36.6 | 1.6 × 1018 | 2025 | 0.13 | >1.9 × 1043 | |
| 13CO | υ = 1−0 | −3.2 | 16.5 | 1.6 × 1017 | 725 | 0.47 | >2.4 × 1043 |
| C18O | υ = 1−0 | −1.2 | 10.3 | 2.0 × 1016 | 975 | 0.23 | 7.4 × 1041 |
Notes. (α): ∆V is the offset of the line centre with respect to the heliocentric velocity of DR Tau, ~27.6 km s−1. (β): As both 12CO and 13CO are found to be optically thick (see Sect. 4.2.3), the values listed for the total number of molecules must be treated as lower limits.
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