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

Open Access

Fig. 2

Median, telluric-corrected, normalised spectra of HD 131488 (top) and HD 110058 (bottom), shown in black. The blue line shows a model of the H₂ v=1-0 S(0) line, assuming a temperature corresponding to the CO kinetic temperature we derive from our results and an H₂ column density corresponding to an ISM-like, primordial $\frac{CO}{H_{2}}$ $Mathematical equation: $\frac{\text{CO}}{\text{H}_2}$$ ratio of 10⁻⁴.

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