Title: Water ice on the surface of protoplanetary disks around HD142527 

Author(s): Honda, M
           Inoue, A. K.
           Fukagawa, M.
           Nakamoto, T.
           Ishii, M.
           Terada, H.
           Takato, N.
           Okamoto, Y. K.
           Shibai, H.
           Tamura, M.
           Itoh, Y.

Abstract: 
Coronagraphic imaging for the Herbig Ae star, HD 142527, was performed 
using the Coronagraphic Imager with Adaptive Optics (CIAO) on the 8.2 m 
Subaru Telescope. The images were obtained in the H2O ice filter (3.08 um) 
using adaptive optics (AO36), and in the L' band (3.8um) without AO. 
Combining these data with previous observational results in the H and K bands, 
we derived the spectra of the scattered light from the circumstellar disk 
around HD 142527 and detected an H2O ice absorption feature in the spectra. 
This result can be explained by the presence of silicate and H2O ice grains 
of ~1 um in size, according to the prediction model by Inoue et al. 2008. 
This grain size is consistent with previous observational study by 
Fukagawa et al. 2006 and Fujiwara et al. 2006. The present result 
demonstrates that high-resolution imaging of disk-scattered light in the 
ice band is useful for detecting H2O ice grain and tracing its distributions
 in circumstellar disks.