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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.

(b)

The elemental H/D abundance ratio is affected by the presence of two identical nuclei of H.

(c)

These H/D abundance ratios are from Cernicharo et al. (2020c).

(d)

This isomer of HC3N has not yet been detected in space.

(e)

The elemental H/D abundance ratio is affected by the presence of three identical nuclei of H.

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