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.3

Reactions from KIDA corrected with the endothermicity found by Tinacci et al. (2023).

Reaction	α [cm³.s⁻¹]	β	γ_KIDA [K]	γ_corrected [K]
$C_{2} H_{3} + {C H}_{3}^{+} \to H_{2} {C C H}^{+} + H_{2} + H$ $Mathematical equation: $\[\mathrm{C}_{2} \mathrm{H}_{3}+\mathrm{CH}_{3}^{+} \rightarrow \mathrm{H}_{2} \mathrm{CCH}^{+}+\mathrm{H}_{2}+\mathrm{H}\]$$	9.50 × 10⁻¹¹	−0.5	0.0	1878
CH₄ + H₂CCC → CH₃ + CH₂CCH	5.90 × 10⁻¹¹	0.0	0.0	2210
H₂ + C₃H₂ → H + CH₂CCH	3.74 × 10⁻¹²	2.0	1740	8766
CH₂ + C₄H₂ → CH₃ + C₄H	2.16 × 10⁻¹¹	0.0	2160	11400
$H_{2} + C_{4} H_{2}^{+} \to H + C_{4} H_{3}^{+}$ $Mathematical equation: $\[\mathrm{H}_{2}+\mathrm{C}_{4} \mathrm{H}_{2}^{+} \rightarrow \mathrm{H}+\mathrm{C}_{4} \mathrm{H}_{3}^{+}\]$$	1.00 × 10⁻⁹	0.0	2000	5339
H₂ + C₅H → H + C₅H₂	1.14 × 10⁻¹¹	0.0	950	9578
H₂ + C₅ → H + C₅H	1.60 × 10⁻¹⁰	0.0	1420	9780

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