S18A0054abst

S18A0054

Icy grains play an important role on planetesimal/planet formation and related matters. Therefore, to reveal ice dust distribution within a protoplanetary disk is an important work for understanding planet formation. However, observations of icy grain IN THE DISK are scarce due to various observational limitations. Thanks to the high spatial resolution of the 8m class telescope, it is now possible to resolve scattered light from the disks. Here we propose observations to trace the icy grains by L-band spectropolarimetric observations of disk scattered light to derive H₂O ice dust distribution in a disk surface via 3.1 µm absorption. We have already demonstrated the effectiveness of similar observing method toward some sources, but ice distribution at the inner disk region was impossible due to the speckle noise. By making use of the dual beam polarimetric capability by Subaru/IRCS, we can trace inner region of the disk, which is an important step toward direct detection of water snowline.

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