S22A0052

Direct imaging of debris disks is essential to reveal its detailed features such as disk morphology and dust grain properties. The radius of debris disk has an empirical relation to the luminosity of host stars, reflecting the outer edge of planet formation or the sublimation temperature of some molecules such as CO snowline. However, the relation relies on a few disks associated with low-mass stars such as the edge-on disk of AU Mic. In order to mitigate the sample bias and to understand the origin of cold debris disks, we propose to detect new debris disk for GKM-type stars via scattered-light imaging with SCExAO. The observation drastically increases the number of imaged debris disks for low-mass stars, and the sample bias in the R_disk−L_* relation is mitigated. According to the imaging survey in the southern sky with Gemini-S/GPI, the direct-detection rate of debris disk is remarkably high for the objects with fractional luminosity L_IR/L_* > 10^−2.75. We have selected the most probable targets from Gaia DR2 and AKARI/FIS to resolve new debris disks by SCExAO. We request a night of the Subaru telescope in S22A.

This document was translated from L^AT_EX by H^EV^EA.