XUE: The CO2-rich terrestrial planet-forming region of an externally irradiated Herbig disk

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Volume 701 (September 2025)

A&A, 701 (2025) A14

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Table 2

Best-fit $χ_{red}^{2}$ $\[\chi_{\text {red }}^{2}\]$ parameters from 0D gas slab modeling of the detected emission of CO (4.9–5.2 μm) and CO₂ (12.9–17.6 μm).

Species	log₁₀(N_tot) [cm⁻²]	T_gas [K]	R_em [au]	$χ_{red, min}^{2}$ $\[\chi_{\text {red, min }}^{2}\]$
¹²CO	${14.0}_{- 0}^{+ 1.4}$ $\[14.0_{-0}^{+1.4}\]$	$1850_{- 1150}^{+ 750}$ $\[1850_{-1150}^{+750}\]$	$10_{- 5}^{+ 0}$ $\[10_{-5}^{+0}\]$	1.1
Fixed emitting radius
¹²CO₂	${20.11}_{- 1.69}^{+ 2.89}$ $\[20.11_{-1.69}^{+2.89}\]$	$365_{- 186}^{+ 438}$ $\[365_{-186}^{+438}\]$	${1.15}_{- 0.14}^{+ 1.89}$ $\[1.15_{-0.14}^{+1.89}\]$	1.6
¹³CO₂	${19.9}_{- 2.9}^{+ 2.7}$ $\[19.9_{-2.9}^{+2.7}\]$	$304_{- 54}^{+ 896}$ $\[304_{-54}^{+896}\]$	1.15	1.8
¹⁶O¹²C¹⁸O	${18.3}_{- 1.3}^{+ 0.8}$ $\[18.3_{-1.3}^{+0.8}\]$	$365_{- 41}^{+ 362}$ $\[365_{-41}^{+362}\]$	1.15	1.6
¹⁶O¹²C¹⁷O	${17.87}_{- 1.29}^{+ 1.03}$ $\[17.87_{-1.29}^{+1.03}\]$	$324_{- 51}^{+ 570}$ $\[324_{-51}^{+570}\]$	1.15	1.2
Free emitting radius
¹³CO₂	${18.7}_{- 3.7}^{+ 4.3}$ $\[18.7_{-3.7}^{+4.3}\]$	$609_{- 475}^{+ 591}$ $\[609_{-475}^{+591}\]$	${0.49}_{- 0.4}^{+ 0.01}$ $\[0.49_{-0.4}^{+0.01}\]$	1.6
¹⁶O¹²C¹⁸O	${18.2}_{- 3.2}^{+ 2.4}$ $\[18.2_{-3.2}^{+2.4}\]$	$344_{- 206}^{+ 540}$ $\[344_{-206}^{+540}\]$	${1.2}_{- 0.7}^{+ 8.8}$ $\[1.2_{-0.7}^{+8.8}\]$	1.6
¹⁶O¹²C¹⁷O	${17.67}_{- 2.70}^{+ 2.04}$ $\[17.67_{-2.70}^{+2.04}\]$	$467_{- 333}^{+ 378}$ $\[467_{-333}^{+378}\]$	${0.8}_{- 0.3}^{+ 9.2}$ $\[0.8_{-0.3}^{+9.2}\]$	1.04

Notes. Column (5) reports the minimum reduced chi-square found for each fit. The ± error bars, where indicated, refer to the 1σ chi-square contours.

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