M. Honda et al 2009 ApJ 690 L110 doi:10.1088/0004-637X/690/2/L110
M. Honda1, A. K. Inoue2, M. Fukagawa3, A. Oka4, T. Nakamoto4, M. Ishii5, H. Terada5, N. Takato5, H. Kawakita6, Y. K. Okamoto7, H. Shibai3, M. Tamura8, T. Kudo8 and Y. Itoh9
Show affiliationsCoronagraphic 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 (λ = 3.08 μm) using adaptive optics (AO), and in the L' band 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 μm in size, according to the prediction model by Inoue et al. This grain size is consistent with previous observational study by Fukagawa et al. and Fujiwara et al. The present result demonstrates that high-resolution imaging of disk-scattered light in the ice band is useful for detecting H2O ice grain distributions in circumstellar disks.
95.75.Qr Adaptive and segmented optics
97.82.Jw Infrared excess; debris disks; protoplanetary disks; exo-zodiacal dust
97.82.Cp Photometric and spectroscopic detection; coronographic detection; interferometric detection
Issue 2 (2009 January 10)
Received 2008 July 31, accepted for publication 2008 November 18
Published 2008 December 19
M. Honda et al 2009 ApJ 690 L110
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