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Fig. 8

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N2/CO (top panel) and CO/H2O (bottom panel) abundance ratios in pebbles represented as a function of heliocentric distance in the case of scenario 2, and compared with those measured in R2’s coma (blue bar) at 0.1, 0.5 and 1 Myr of the PSN evolution. Only the N2/CO ratio is reproduced in R2 at 8 au and 1 Myr. The CO/H2O ratio is however approached by our model at the same location and epoch of the PSN evolution.

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