S22A0132

We propose SCExAO/CHARIS imaging of young, astrometrically accelerating BAF stars identified by the Hipparcos-Gaia Catalog of Accelerations (HGCA) to discover and characterize their unseen companions. New discoveries will not only help expand the diversity of Jovian planet atmospheric evolution, providing better constraints on atmospheric models, but it will also vastly expand the number of planets available for direct imaging by both ground and future space-based missions, further advancing our scientific understating of these planets. The combination of imaging with HGCA astrometric acceleration of each system across a 25 year baseline will allow for the derivation of dynamical masses for the companions, providing an independent anchor for stellar and planetary evolution models and removing degeneracies between factors derived from spectral model comparison, such as temperature and atmospheric chemistry. We present a list of 24 targets selected to optimize the likelihood of substellar companions as well as their detectability, and request three nights of SCExAO/CHARIS time for their observation. Observing ∼ 6−8 targets per night, we expect to find, on average, >∼ 1-2 candidate planets per full night.

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