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Table 7
Comparison at 300 AU between the observed ratios H2S/CO in the three disks of MWC480, DM Tau and LkCa15 and the same ratios in comet Hale-Bopp.
| Source | Σ300 (cm-2) | H2S/CO |
|
|
||
| DM Tau | 3.7 × 1017 | ≤ 4 × 10-5 |
| LkCa15 | 1.8 × 1017 | ≤ 10-6 |
| MWC 480 | 2.3 × 1017 | ≤ 10-5 |
|
|
||
| Hale-Bopp | – | 0.07 |
Notes. The CO surface densities at 300 AU (Piétu et al. 2007) are extrapolated from 13CO and multiplied by 70.
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