S19B0040abst
S19B0040
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 imaging/spectro-polarimetric observations of disk scattered light to derive H2O ice dust distribution in HL Tau disk surface via 3.1Β΅m absorption. ALMA observations revealed the fascinating rings and gaps in the HL Tau disk, and their origin is a matter of debate. One interesting explanation is the snow line of various ice grains. We would like to apply our observing method toward HL Tau disk to map the ice distribution, which will provide a clue for the possible origin of the structure of HL Tau disk rings and gaps.
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