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Fig. 16

image

12CO2 (thin lines) and 13CO2 spectra (thick lines) of models with an enhanced CO2 abundance around the CO2 iceline. The models have a constant abundance of CO2 of 10-8 throughout most of the disk. The grey lines denote the model without any local enhancements in the CO2 abundance in an annulus around the CO2 iceline. The cyan, red and blue lines show the models with an enhanced abundance of 10-6, 10-5 and 10-4, respectively. The 12CO2 flux is enhanced by a factor of 2 to 4 over the complete range of the spectra. The 13CO2Q-branch however becomes more than an order of magnitude stronger, and the peak flux of the feature becomes higher than the peak flux of the neighbouring 12CO2 lines for the highest abundances. The spectra with enhanced CO2 abundances are shifted vertically for clarity.

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