(Proposal ID) S15B-119

(PI) Kudo, Tomoyuki

(Proposal Title)
First direct imaging of disk rotation pattern around young stellar objects.

(Abstract)
Investigation of proto-planetary disks is important to understand the origin 
of the Earth and our solar system. Recently, 8m class ground-based telescopes 
equipped with adaptive optics (AO) and polarimetric differential imaging (PDI) 
technique such as the Subaru telescope and the VLT can probe inner fine 
structures (spiral or gap) within a few arcseconds. The spiral structures and 
offsets for some gaps are indicative of the dynamical processes in a proto-
planetary disk, which are possibly connected to the planet formation processes.
 In order to detect the motion of the disk structures, we propose to observe 3 
Herbig Ae disks and 2 T-Tauri disks with HiCIAO PDI+ADI mode in the H-band 
(1.6 mu m). In this proposal we will focus on a time variation of disk shape 
which has been observed from 2009 through 2015. According to the the density 
wave theory, these spiral patterns are expected to rotate during a few years. 
Considering the HiCIAO+AO188 capability (FWHM ~0.06 arcsec), the pattern 
difference will be detected. Our proposed observations will provide not only 
the information of the disk evolution but also the location and mass of 
forming wide-orbit planets, which will be one of the important progresses to 
understand the diversity of the planet formation.