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Table 3.
Deuteration enhancement in TMC-1 for selected molecules compared to our gas-phase chemical model.
Model (a) | Model (a) | Model (a) | ||
---|---|---|---|---|
Molecule | TMC-1 | N/O = 0.5 | N/O = 1 | N/O = 1.5 |
H2CCN/HDCCN | 20 (b) | 17.6 | 16.2 | 15.2 |
HC3N/DC3N (c) | 62 | 78.8 | 75.3 | 73.0 |
HNCCC/DNCCC (c) | 43 | 34.8 | 35.9 | 37.2 |
HCCNC/DCCNC (c) | 30 | 71.7 | 68.3 | 65.9 |
HCNCC/DCNCC (d) | 21.2 | 20.9 | 20.6 | |
HC5N/DC5N (c) | 82 | 27.8 | 28.3 | 29.4 |
CH3CCH/CH3CCD | 49 | 204.6 | 210. | 213.3 |
CH3CCH/CH2DCCH | 10 (e) | 68.2 | 70.1 | 71.1 |
CH3CN/CH2DCN | 11 (e) | 10.2 | 9.9 | 9.7 |
c-C3H2/c-C3HD | 27 (b) | 45.5 | 45.1 | 45.1 |
H2C4/HDC4 | 83 (b) | 114.4 | 113.6 | 114.4 |
C4H/C4D | 118 | 104.3 | 107.1 | 109.5 |
Notes.
(a)
See text for the assumed physical conditions. [O/H] = 8 × 10−6, D/H = 1.5 × 10−5, and C/O = 0.75.
(c)
These H/D abundance ratios are from Cernicharo et al. (2020c).
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