Mid-infrared ( MIR ) images of the Herbig Ae star HD 142527 were obtained at 18.8 and 24.5 \micron with the Subaru/COMICS .
Bright extended arc-like emission ( outer disk ) is recognized at r = 0 \farcs 85 together with a strong central source ( inner disk ) and a gap around r = 0 \farcs 6 in the both images .
Thermal emission of the eastern side is much brighter than that of the western side in the MIR .
We estimate the dust size as a few \micron from the observed color of the extended emission and the distance from the star .
The dust temperature T and the optical depth \tau of the MIR emitting dust are also derived from the two images as T = 82 \pm 1 K , \tau = 0.052 \pm 0.001 for the eastern side and T = 85 \pm 3 K , \tau = 0.018 \pm 0.001 for the western side .
The observed asymmetry in the brightness can be attributed to the difference in the optical depth of the MIR emitting dust .
To account for the present observations , we propose an inclined disk model , in which the outer disk is inclined along the east-west direction with the eastern side being in the far side and the inner rim of the outer disk in the eatern side is exposed directly to us .
The proposed model can successfully account for the MIR observations as well as near-infrared ( NIR ) images of the scattering light , in which the asymmetry is seen in the opposite sense and the forward scattering light ( near side – western side ) is brighter .