The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) - VII. Optically thick gas with broad CO gaussian local line profiles in the HD 121617 disc

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Volume 705 (January 2026)

A&A, 705 (2026) A201

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Table 3

Best-fit values derived from fitting a simple toy model to an ¹²CO and ¹³CO local line profiles.

	Best-fit value
¹²CO τ₀	${0.50}_{- 0.33}^{+ 0.13}$ $\[0.50_{-0.33}^{+0.13}\]$
¹³CO τ₀	${0.30}_{- 0.32}^{+ 0.12}$ $\[0.30_{-0.32}^{+0.12}\]$
T_exc (K)	$80_{- 14}^{+ 66}$ $\[80_{-14}^{+66}\]$
T_kin (K)	$600_{- 27}^{+ 38}$ $\[600_{-27}^{+38}\]$
v_BARY (m s⁻¹)	$7858_{- 3}^{+ 2}$ $\[7858_{-3}^{+2}\]$
ln (f₁₂)	$- {1.4}_{- 0.12}^{+ 0.02}$ $\[-1.4_{-0.12}^{+0.02}\]$
ln (f₁₃)	$- {1.1}_{- 0.13}^{+ 0.12}$ $\[-1.1_{-0.13}^{+0.12}\]$

Notes. The local line profiles were created from an annulus extracted at the peak gas surface density ( $0_{\cdot}^{''} 61$ $\[0^{\prime\prime}_\cdot61\]$ – $0_{\cdot}^{''} 63$ $\[0^{\prime\prime}_\cdot63\]$ ). The quoted best-fit values are the median of the marginalised distribution. The uncertainties are based on the 16th and 84th percentiles of the marginalised distributions.

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