S20A0137abst
S20A0137
Direct imaging has searched for exoplanets so far around more than several hundreds of nearby stars, and revealed that wide-orbit (5β100 au) brown dwarf or Jupiter-like companions are rare. This implies that those substellar companions can be rarely discovered by blind direct-imaging surveys. To overcome this problem, we utilize the catalogue of proper-motion accelerations identified by the combination of Hipparcos and GAIA high-precision astrometry. The proper motion of a star is accelerated if it hosts a companion, and the Hipparcos-GAIA (H-G) catalogue is sensitive to even the acceleration caused by a planet. Here, we propose the deep direct imaging with SCExAO/CHARIS for the five Sun-like stars that are the members of nearby young moving groups and have the proper motion accelerations identified by the H-G catalogue. This program aims to efficiently discover young substellar companions including giant exoplanets. The discoveries can lead to their follow-up characterizations to better understand the various properties of substellar companions. Also, the combinations of the data from this program and the other surveys, and the H-G catalogue help the statistical constraint for wide-orbit substellar companions.
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