Table 3
Geometric properties of the emission for each pure rotational line (see Figure 5).
| rext (au) | Rgeo (au) | θ̄open (deg) | θ0 (deg) | θ1 (deg) | θopen in Tau 042021 (deg) | SY Cha (deg) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| int. | cnv. | int. | cnv. | int. | cnv. | int. | cnv. | int. | cnv. | |||
| S(1) | 288 | 300 | 24.4 | −31.6 | 49.7 | 40.2 | 53.1 | 36.2 | 12.1 | −26.0 | − | − |
| S(2) | 270 | 278 | 32.8 | 3.97 | 42.8 | 37.4 | 48.1 | 36.4 | 22.2 | −9.9 | 35 ± 5 | – |
| S(3) | 239 | 244 | 31.8 | 11.6 | 40.5 | 36.0 | 45.8 | 36.5 | 23.3 | −0.7 | − | 58 ± 3 |
| S(4) | 201 | 206 | 29.3 | 13.0 | 39.0 | 35.2 | 44.1 | 36.0 | 23.0 | 1.7 | − | 52 ± 3 |
| S(5) | 154 | 159 | 26.9 | 14.5 | 39.1 | 34.6 | 43.2 | 35.9 | 22.3 | 4.1 | − | 48 ± 2 |
| S(6) | 127 | 131 | 27.0 | 15.0 | 38.0 | 33.8 | 42.4 | 35.2 | 21.6 | 3.9 | − | 58 ± 3 |
| S(7) | 94.7 | 98.7 | 26.4 | 14.2 | 37.2 | 33.0 | 40.5 | 34.5 | 16.7 | 2.6 | − | 64 ± 3 |
| S(8) | 76.5 | 82.7 | 26.0 | 14.6 | 37.3 | 32.2 | 40.4 | 33.7 | 17.7 | 1.6 | − | − |
| S(9) | 51.1 | 55.2 | 25.7 | 18.5 | 37.1 | 32.6 | 40.3 | 35.1 | 17.9 | 4.7 | 38.5 ± 4.5; 37.6 ± 2.6 | − |
Notes. The emission extent rext, the geometric radius Rgeo, and the average semi-opening angle θ̄open, along with logarithmic fits, θopen = θ0 -θ1 log(r/102 au). “int.” and “cnv.” refer to measurements based on the intrinsic intensity maps (Figure 5) and the maps convolved with 2D Gaussians representing PSFs, respectively. The second rightmost column shows the observed semi-opening angles for the S(2) (Arulanantham et al. 2024) and S(9) (Pascucci et al. 2025) emissions from Tau 042021. The S(9) values are based on a PSF-deconvolved image, with the two measurements corresponding to the blue- and red-shifted lobes. The rightmost column shows the semi-opening angles of SY Cha, taken from Schwarz et al. (2025b).
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