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Fig. 7

image

H2O ice (top) and HDO ice (middle) abundances in the fluid parcels that are located in the disk at t = tacc as functions of the normalized UV fluence. The bottom panel shows HDO/H2O ice ratio (black), D2O/H2O ice ratio (light gray), and the ratio of D2O/HDO to HDO/H2O ice ratio (gray). Only the fluid parcels in which the H2O ice abundance is larger than 10-5 are plotted. The blue and red dashed lines depict the expected H2O (or HDO) ice abundance when only photodesorption is an allowed chemical process and when only photodissociation and photodesorption are included, respectively. See the main text for more details.

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