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We present resolved Plateau de Bure Array observations of DM Tau in lines ofHCO+ (3-2), (1-0) and DCO+ (3-2). A power-law fitting approach allowed aderivation of column densities of these two molecules. A chemical inner hole of~50 AU was found in both HCO+ and DCO+ with DCO+ emission extending to only 450AU. An isotopic ratio of R_D = N(DCO+) / N(HCO+) was found to range from 0.1 at50 AU and 0.2 at 450 AU. Chemical modeling allowed an exploration of thesensitivity of these molecular abundances to physical parameters out withtemperature, finding that X-rays were the domination ionization source in theHCO+ molecular region and that R_D also is sensitive to the CO depletion. Theionization fraction, assuming a steady state system, was found to be x(e-) ~10$^{-7}$. Modeling suggests that HCO+ is the dominant charged molecule in thedisk but its contribution to ionization fraction is dwarfed by atmoic ions suchas C+, S+ and H+.

Chemistry in Disks. IX. Observations and modeling of HCO+ and DCO+ in DM Tau