  Dormant comets in the near-Earth object (NEO) population are thought to be
involved in the terrestrial accretion of water and organic materials.
Identification of dormant comets is difficult as they are observationally
indistinguishable from their asteroidal counterparts, however they may have
produced dust during their final active stages which potentially are detectable
today as weak meteor showers at the Earth. Here we present the result of a
reconnaissance survey looking for dormant comets using 13~567~542 meteor orbits
measured by the Canadian Meteor Orbit Radar (CMOR). We simulate the dynamical
evolution of the hypothetical meteoroid streams originated from 407 near-Earth
asteroids in cometary orbits (NEACOs) that resemble orbital characteristics of
Jupiter-family comets (JFCs). Out of the 44 hypothetical showers that are
predicted to be detectable by CMOR, we identify 5 positive detections that are
statistically unlikely to be chance associations, including 3 previously known
associations. This translates to a lower limit to the dormant comet fraction of
$2.0\pm1.7\%$ in the NEO population and a dormancy rate of $\sim
10^{-5}~\mathrm{yr^{-1}}$ per comet. The low dormancy rate confirms disruption
and dynamical removal as the dominant end state for near-Earth JFCs. We also
predict the existence of a significant number of meteoroid streams whose
parents have already been disrupted or dynamically removed.

Earth and Planetary Astrophysics