Fig. 14.

Vertical structure of the CO photodissociation rate (left panel) and the CO/C/C⁺ interface (right panels) at a radius of 1 au from the star for the T Tauri disk. We show results from our fiducial model, a model in which a 4000 K blackbody stellar spectrum is considered, and a model in which all photodestruction rates are computed using parametric expressions (see text). The dotted lines in the three right panels indicate what is the peak abundance of atomic carbon and at which height it is reached in the fiducial model. The small drop in the abundance of CO seen around z/r ~ 0.15, which is more marked in the 4000 K blackbody star model, is due to a maximum in the abundance of water.