Chemistry and IR emission of acetylene in planet-forming regions of T Tauri disks - Impact of elemental abundances and dust properties

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Volume 711 (July 2026)

A&A, 711 (2026) A255

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Table B.4

Reactions corrected with the reaction enthalpy found by Tinacci et al. (2023), but not included in the chemical network.

Reaction	α [cm³.s⁻¹]	β	γ_KIDA [K]	γ_corrected [K]
$H_{2} + C_{5} H^{+} \to H + C_{5} H_{2}^{+}$ $Mathematical equation: $\[\mathrm{H}_{2}+\mathrm{C}_{5} \mathrm{H}^{+} \rightarrow \mathrm{H}+\mathrm{C}_{5} \mathrm{H}_{2}^{+}\]$$	1e-17	0.0	0	20421
$H_{2} + C_{2}^{+} \to C_{2} H + H^{+}$ $Mathematical equation: $\[\mathrm{H}_{2}+\mathrm{C}_{2}^{+} \rightarrow \mathrm{C}_{2} \mathrm{H}+\mathrm{H}^{+}\]$$	1.5e-09	0.0	1260	18358
$C_{4} H_{2} + C_{3} H^{+} \to C_{2} H + C_{5} H_{2}^{+}$ $Mathematical equation: $\[\mathrm{C}_{4} \mathrm{H}_{2}+\mathrm{C}_{3} \mathrm{H}^{+} \rightarrow \mathrm{C}_{2} \mathrm{H}+\mathrm{C}_{5} \mathrm{H}_{2}^{+}\]$$	1e-09	0.0	0	24113
CH₃ + CH₃CCH → C₂H + CH₃CH₃	8.32e-13	0.0	4430	18587
CH₃ + C₄H₃ → C₂H + C₃H₅	1.2e-10	0.0	0	12037
C₂H₂ + C₂H₅ → C₂H + CH₃CH₃	4.5e-13	0.0	11800	16172
$H + C_{5} H_{3}^{+} \to H_{2} + C_{5} H_{2}^{+}$ $Mathematical equation: $\[\mathrm{H}+\mathrm{C}_{5} \mathrm{H}_{3}^{+} \rightarrow \mathrm{H}_{2}+\mathrm{C}_{5} \mathrm{H}_{2}^{+}\]$$	7e-10	0.0	700	13558
H₂ + C₃ → H + C₃H	8e-12	0.0	1420	14287
H + C₄H₂ → C₂H + C₂H₂	9.96e-10	0.0	7750	14194
H + C₅H₂ → C₂H + H₂CCC	4.98e-10	0.0	7750	13973
H₂ + C₄H₂ → H + C₄H₃	4.91e-10	−0.16	27900	29610

Notes. The activation barrier (γ_corrected) is above the threshold of 12000 K.

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