Table 3
Comparison with other disks(1) .
| AB Aur | DM Tau | LkCa15 | TW Hya | HD163296 | MWC 480 | ||
| Trot = 10 K | Trot = 20 K | ||||||
|
|
|||||||
| X(HCO+)(1) | 1.8 × 10-11 | 2.8 × 10-11 | 7.4 × 10-10 | 5.6 × 10-12 | 2.2 × 10-11 | 7.8 × 10-12 | 1.0 × 10-10 |
| X(CN) | 1.0 × 10-10 | 1.4 × 10-10 | 3.2 × 10-9 | 2.4 × 10-10 | 1.2 × 10-10 | 1.3 × 10-10 | 1.4 × 10-10 |
| X(CS) | 3.6 × 10-11 | 3.4 × 10-11 | 3.3 × 10-10 | <8.5 × 10-11 | |||
| X(C2H) | <2.1 × 10-11 | <1.1 × 10-11 | 1.1 × 10-8 | ||||
| X(H2CO) | 4.5 × 10-11 | 5.3 × 10-11 | 5.0 × 10-10 | <1.4 × 10-12 | 1.0 × 10-11 | <1.4 × 10-11 | |
| X(SO) | 4.4 × 10-11 | 4.6 × 10-11 | <3.0 × 10-11 | <2.0 × 10-11 | <4.1 × 10-11 | ||
| X(HCN) | 1.7 × 10-11 | 1.0 × 10-11 | 4.9 × 10-10 | 3.1 × 10-11 | 1.6 × 10-11 | <9.1 × 10-12 | <1.1 × 10-11 |
| X(c-C3H2) | <2.4 × 10-11 | <1.0 × 10-11 | <1.3 × 10-11 | <1.3 × 10-11 | |||
| X(DCO+) | 7.1 × 10-13 | 7.9 × 10-13 | <7.9 × 10-13 | 7.8 × 10-13 | |||
| X(DCN) | <3.8 × 10-12 | <4.3 × 10-12 | |||||
| X(SiO) | <1.7 × 10-11 | <2.4 × 10-11 | |||||
| X(HCO) | <1.9 × 10-10 | <3.9 × 10-10 | |||||
| X(H2S) | 8.3 × 10-11 | 6.3 × 10-11 | |||||
|
|
|||||||
| X(CN)/X(HCN) | 6 | 14 | 6 | 8 | 7 | >14 | >13 |
| X(CS)/X(SO) | 0.8 | 0.7 | >11 | ||||
| X(DCO+)/X(HCO+) | 0.04 | 0.03 | 0.03 | 0.004 | |||
| X(H2CO)/X(HCO+) | 2.5 | 2 | 0.7 | <0.06 | 1.3 | <0.14 | |
| X(C2H)/X(HCO+) | <1 | <0.4 | 15 | ||||
Notes.
Abundances relative to H2 were calculated assuming a disk diameter of 13′′ for AB Aur (Piétu et al. 2005), 6′′ for LkCa15 (Thi et al. 2004) and 13′′ for DM Tau (Piétu et al. 2007). The assumed disk-averaged molecular hydrogen column densities are N(H2) = 1.1 × 1022 cm-2 for AB Aur, 2.7 × 1022 cm-2 for DM Tau and 1.4 × 1023 cm-2 for LkCa15. In our calculations for DM Tau and LkCa15, we adopt Trot = 10 K. Abundances for the other disks/molecules are taken from Dutrey et al. (1997) (for DM Tau), Thi et al. (2004) and Guilloteau et al. (2006).
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