MINDS. Hydrocarbons detected by JWST/MIRI in the inner disk of Sz28 consistent with a high C/O gas-phase chemistry

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Volume 689 (September 2024)

A&A, 689 (2024) A231

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Table 3

Best-fit slab model parameters for the molecules detected in Sz28.

Molecules	T (K)	log₁₀ N (cm⁻²)	R_em (au)	$N$ $\[\mathcal{N}\]$
C₂H₂	$425_{- 225}^{+ 175}$ $\[425_{-225}^{+175}\]$	20.67_−2.17	${0.015}_{- 0.005}^{+ 0.015}$ $\[0.015_{-0.005}^{+0.015}\]$
		${18.33}_{- 1.03}^{+ 1.67}$ $\[18.33_{-1.03}^{+1.67}\]$	${0.03}_{- 0.02}^{+ 0.07}$ $\[0.03_{-0.02}^{+0.07}\]$
C₆H₆	$225_{- 115}^{+ 325}$ $\[225_{-115}^{+325}\]$	${18.17}_{- 0.67}^{+ 1.33}$ $\[18.17_{-0.67}^{+1.33}\]$	${0.07}_{- 0.06}^{+ 0.53}$ $\[0.07_{-0.06}^{+0.53}\]$	5 × 10⁴²
C₃H₄	$250_{- 50}^{+ 200}$ $\[250_{-50}^{+200}\]$	${15.83}_{- 0.83}^{+ 1.67}$ $\[15.83_{-0.83}^{+1.67}\]$	${0.38}_{- 0.33}^{+ 0.62}$ $\[0.38_{-0.33}^{+0.62}\]$	1.2 × 10⁴¹
C₄H₂	$250_{- 50}^{+ 200}$ $\[250_{-50}^{+200}\]$	${16.33}_{- 0.83}^{+ 1.67}$ $\[16.33_{-0.83}^{+1.67}\]$	${0.067}_{- 0.017}^{+ 0.93}$ $\[0.067_{-0.017}^{+0.93}\]$	6.7 × 10⁴⁰

HCN	detected
CO₂	detected
HC₃N	detected
C₂H₆	detected
CH₃	detected
CH₄	detected

Notes. For optically thin emission, $N$ $\[\mathcal{N}\]$ represents the number of molecules obtained as a product of $N \times π R_{e m}^{2}$ $\[N \times \pi R_{\mathrm{em}}^2\]$ . The values for the optically thick and thin component of C₂H₂ are provided. The fitting procedure did not yield a well-constrained solution for the molecules labelled as “detected”.

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