High CO/H2 ratio supports an exocometary origin for a CO-rich debris disc

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Table 3

CRIRES+ CO/H₂ modelling results.

Parameter	HD 110058	HD 131488
log(N_CO (cm⁻²))	${20.0}_{- 0.2}^{+ 0.3}$ $Mathematical equation: $20.0^{+0.3}_{-0.2}$$	${18.05}_{- 0.04}^{+ 0.06}$ $Mathematical equation: $18.05^{+0.06}_{-0.04}$$
v_r (km s⁻¹)	${12.53}_{- 0.01}^{+ 0.01}$ $Mathematical equation: $12.53^{+0.01}_{-0.01}$$	${5.87}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $5.87^{+0.05}_{-0.05}$$
T_kin (K)	$133_{- 18}^{+ 19}$ $Mathematical equation: $133^{+19}_{-18}$$	$142_{- 55}^{+ 103}$ $Mathematical equation: $142^{+103}_{-55}$$
T_rot (K)	$74_{- 7}^{+ 7}$ $Mathematical equation: $74^{+7}_{-7}$$	$45_{- 3}^{+ 3}$ $Mathematical equation: $45^{+3}_{-3}$$
log(N_H₂ (cm⁻²))	<22.84	<22.55
CO/H₂ Ratio	>1.35 × 10⁻³	>3.09 × 10⁻⁵

Notes. Best-fit values correspond to the highest log posterior probability with 1σ uncertainties (16^th and 84^th percentiles of the posterior distributions). The H₂ column density (upper limits at the 99.7^th percentile) and CO/H₂ ratios assume the H₂ shares the same kinetic temperature as the CO.

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