S22B0091

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 help expand the diversity of measured Jovian planet atmospheres, providing better constraints on atmospheric and evolutionary models, as well as vastly expand the number of planets available for direct imaging by both ground and space-based missions, further advancing our scientific understating of these planets. Combining imaging with astrometry across a 25 year baseline will allow dynamical mass measurements for the companions, providing an independent anchor for stellar and planetary evolution models and removing degeneracies between factors derived from spectral model comparison. We present 24 targets selected from the updated HGCA with Gaia eDR3, to optimize the likelihood of substellar companions as well as their detectability, and request 3 nights of SCExAO/CHARIS time for their observation. The increased yield of this program has been demonstrated, with the first 2.5 nights using the eDR3 HGCA targets returning 3 candidate companions, including one candidate planet. We anticipate an average of >∼ 1-2 candidate companions per full night.

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