  We present the results of a study of the prospect of detecting habitable
Trojan planets in the Kepler Habitable Zone circumbinary planetary systems
(Kepler-16, -47, -453, -1647, -1661). We integrated the orbits of 10,000
separate N-body systems (N=4,6), each with a one Earth-mass body in a randomly
selected orbit near the L4 and L5 Lagrangian points of the host HZ circumbinary
planet. We find that stable Trojan planets are restricted to a narrow range of
semimajor axes in all five systems and limited to small eccentricities in
Kepler-16, -47, and -1661. To assess the prospect of the detection of these
habitable Trojan planets, we calculated the amplitudes of the variations they
cause in the transit timing of their host bodies. Results show that the mean
amplitudes of the transit timing variations (TTVs) correlate with the mass of
the transiting planet and range from 70 minutes for Kepler-16b to 390 minutes
for Kepler-47c. Our analysis indicates that the TTVs of the circumbinary
planets caused by these Trojan bodies fall within the detectable range of
timing precision obtained from the Kepler telescope's long-cadence data. The
latter points to Kepler data as a viable source to search for habitable Trojan
planets.
