  We present a bulk sample analysis of the metal polluted white dwarfs which
also host infrared bright dusty debris disks, known to be direct signatures of
an active exoplanetary accretion source. We explore the relative positions of
these systems in a single-temperature blackbody plane, defined as the
temperature and radius of a single-temperature blackbody as fitted to the
infrared excess. We find that the handful of dust systems which also host
gaseous debris in emission congregate along the high temperature boundary of
the dust disk region in the single-temperature blackbody plane. We discuss
interpretations of this boundary and propose the single-temperature blackbody
plane selection technique for use in future targeted searches of gaseous
emission.
