Orion Source I's disk is salty
  We report the detection of NaCl, KCl, and their $^{37}$Cl and $^{41}$K
isotopologues toward the disk around Orion SrcI. About 60 transitions of these
molecules were identified. This is the first detection of these molecules in
the interstellar medium not associated with the ejecta of evolved stars. It is
also the first ever detection of the vibrationally excited states of these
lines in the ISM above v = 1, with firm detections up to v = 6. The salt
emission traces the region just above the continuum disk, possibly forming the
base of the outflow. The emission from the vibrationally excited transitions is
inconsistent with a single temperature, implying the lines are not in LTE. We
examine several possible explanations of the observed high excitation lines,
concluding that the vibrational states are most likely to be radiatively
excited via rovibrational transitions in the 25-35 {\mu}m (NaCl) and 35-45
{\mu}m (KCl) range. We suggest that the molecules are produced by destruction
of dust particles. Because these molecules are so rare, they are potentially
unique tools for identifying high-mass protostellar disks and measuring the
radiation environment around accreting young stars.
