Chemistry in disks I - Deep search for N${}_2$H${}^{+}$ in the protoplanetary disks around LkCa 15, MWC 480, and DM Tau

Anne Dutrey, Thomas Henning, Stephane Guilloteau +7

Aims: To constrain the ionization fraction in protoplanetary disks, we present new high-sensitivity interferometric observations of N${}_2$H${}^{+}$ in three disks surrounding DM Tau, Lk…