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Two-dimensional distributions and column densities of gaseous molecules in protoplanetary disks

Two-dimensional distributions and column densities of gaseous molecules in protoplanetary disks

We have investigated the two-dimensional () distribution of deuterated molecular species in circumstellar disks around young stellar objects. The abundance ratios between singly deuterated and normal molecules ("D/H ratios") in disks evolve in a similar way as in molecular clouds. Fractionation is caused by rapid exchange reactions that are exothermic …