Q-branch profiles of different models shown at JWST-MIRI resolving power. All fluxes are normalized to the maximum of the feature. In panel a) LTE point models with a temperature of 200K (cyan), 400 K (red) and 800 K (blue) are shown. Panel b) shows DALI disk models with a constant abundance profile for which the product of abundance times gas-to-dust ratio is constant. All these models have very similar total fluxes. The models shown are g/dgas = 100, xCO2 = 3 × 10-7 in red; g/dgas = 1000, xCO2 = 3 × 10-8 in blue and g/dgas = 10000, xCO2 = 3 × 10-9 in cyan. The spectra are virtually indistinguishable. Panel c) shows DALI disk models with a jump abundance profile, a g/ddust = 1000, an outer CO2 abundance of 3 × 10-8 and an inner abundance of 3 × 10-7 (red), 3 × 10-8 (blue), 3 × 10-9 (cyan). The model with the highest inner abundance shows a profile that is slightly broader than those of the other two. Panel d) shows DALI disk models with the same, constant abundance of xCO2 = 3 × 10-8, but with different g/ddust ratios. Removing dust from the upper layers of the disk preferentially boosts the high J lines in the tail of the feature as emission from the dense and hot inner regions of the disk is less occulted by dust.
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