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Table 5
Observed molecular column density ratios relative to C2H2 in disks compared with different chemical models and cometary observations.
| Ratio rel to C2H2 | C2H4 | C2H6 | C6H6 | CH3 | HNC | C3H4 | HC3N | CH4 |
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| IRS 46 | <1.5 | <52 | <0.2 | <0.8 | <0.6 | <3.0 | <0.6 | – |
| GV Tau | <0.6 | <27 | <0.2 | <0.9 | <0.9 | <4.4 | <0.9 | – |
| DR Tau | – | – | – | – | – | – | – | <2.3a |
| R = 3000b | <0.9 | <24 | <0.08 | <0.2 | <0.4 | <1.5 | <0.2 | – |
| R = 50 000b | <0.3 | <14 | <0.04 | <0.03 | <0.04 | <0.9 | <0.1 | – |
| Markwick et al. (2002) 1 AU | – | – | – | 1.0 | 1.0 | 1.0 | 1.0 | 1.1 |
| Markwick et al. (2002) 5 AU | – | – | – | – | 1.0 | 1.0 | 1.0 | 1.1 |
| Najita et al. (2011) ref | – | – | – | 4.0E-4 | – | – | – | 0.09 |
| Najita et al. (2011) O/C = 1.0 | – | – | – | 2.5E-6 | – | – | – | 3.2E-5 |
| Agúndez et al. (2008) 1 AU | – | – | – | – | 0.03 | – | – | 0.01 |
| Agúndez et al. (2008) 3 AU | – | – | – | – | 0.03 | – | – | 0.2 |
| Mumma & Charnley (2011) | – | 0.2–20 | – | – | 0.01–0.5 | – | 0.01–0.7 | 0.2–15 |
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| Ratio rel to C2H2 | HCN | C4H2 | CH3CN | SO2 | NH3 | CO2 | ||
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| IRS 46 | 1.8 | <0.3 | <370 | <11.9 | <1.9 | 4.0 | ||
| GV Tau | 1.3 | <0.2 | <190 | <13.6 | <1.4 | 3.6 | ||
| DR Tau | – | – | – | – | – | – | ||
| R = 3000b | – | <0.1 | <150 | <4.0 | <0.7 | – | ||
| R = 50 000b | – | <0.1 | <22 | <1.2 | <0.1 | – | ||
| Markwick et al. (2002) 1 AU | 1.0 | 1.0 | 1.0 | 0.9 | 1.0 | 1.0 | ||
| Markwick et al. (2002) 5 AU | 1.0 | 1.0 | 1.0 | 0.9 | 1.1 | 1.1 | ||
| Najita et al. (2011) ref | 70 | – | – | 8700 | 310 | 110 | ||
| Najita et al. (2011) O/C = 1.0 | 0.9 | – | – | 1.1 | 0.01 | 0.06 | ||
| Agúndez et al. (2008) 1 AU | 3.0 | – | – | – | 2.0E-4 | 20 | ||
| Agúndez et al. (2008) 3 AU | 1.0 | – | – | – | 0.03 | 2000 | ||
| Mumma & Charnley (2011) | 0.2−5.0 | – | 0.02−0.4 | 0.2−1.0 | 0.6−20 | 5.0−300 | ||
Notes.
(a)
From 3 μm emission data (Mandell et al. 2012).
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