S22A0095

Brown dwarfs (BD) fill the gap between stars and planets, and revealing their formation and evolution is crucial to understand the difference between them. In this proposal, we plan to take images of brown dwarf candidates, whose masses and orbits are fully or partly constrained by radial velocity data and/or astrometry of Gaia and Hipparcos satellites. Notably, 3 of targets, which can be detectable with SCExAO/CHARIS, have well constrained masses and orbits, and 2 of them are around Jupiter’s orbit, 3.4 and 7.2 au, where scenarios with disk gravitational instability or fragmentation of a collapsing cloud are difficult to form such objects. We also plan to image the recently imaged BD near the snow-line, HD 72964b, to cover a wavelength range that was not covered by the previous observation. Our observation will comprehensively investigate masses, radii, and luminosities of BDs around Jupiter’s orbit, and they will be benchmarks for understanding formation and evolution of BDs and giant planets at those separations (<10AU).

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