Table 4
Gradient of the spectral index of the dust opacity 
and a representative value of βenv at 500 au for the envelope of each source.
| Source |  |
β^{env} (500 au) |
|---|---|---|
| IRAS15398–3359 | −0.17 ± 0.20 | 1.41 ± 0.09 |
| VLA1623A | 0.45 ± 0.25 | 1.43 ± 0.05 |
| CB68 | 0.07 ± 0.84 | 1.58 ± 0.42 |
| Elias 29 | 0.48 ± 0.99 | 1.42 ± 0.50 |
| BHB07–11 | −0.26 ± 0.30 | 1.50 ± 0.08 |
| L483 | −0.15 ± 0.79 | 1.69 ± 0.40 |
| IRAS4A | 0.76 ± 0.11 | 1.10 ± 0.03 |
| IRAS4C | − | >1.4 |
| L1551-IRS5 | −0.04 ± 0.11 | 0.94 ± 0.04 |
| RCrA-IRS7B (a) | − | 1.3 ± 0.1 |
| L1527 (a) | 0.39 ± 0.17 | 1.24 ± 0.06 |
Notes. The value of β was extrapolated from the uv-plane for all sources except for IRAS4A, where the image plane value was used (see Section 4.3). Since IRAS4C is detected only at 1.2 mm, a lower limit was derived. For RCrA-IRS7B, the spectral index was derived from the image plane (see Section 4). Moreover, (a) was taken from Cacciapuoti et al. (2023).
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