S22A0118

We propose the continuation of a new-concept direct imaging survey to efficiently discover Jupiter-like companions. The proof of concept of this survey has been already achieved by the discovery of a notable brown dwarf companion (Currie et al. 2020). Our concept largely concentrates on observed proper motion accelerations revealed by the combination of the Hipparcos and Gaia astrometry, an indirect signature suggesting the target hosts a co-moving companion – possibly even exoplanets. We continue the deep SCExAO/CHARIS survey to search for giant planets that cause the accelerations. The proposed targets are nearby Sun-like stars mainly associated with young moving groups and/or having youth indicators, and thus our deep imaging boosted by longer integration (> 90 minutes) reaches the sensitivity limits necessary for most candidates. Our demonstrated approach enables us to overcome the low yield of blind direct imaging surveys, to identify highly promising targets and accelerate giant planet companion discovery and characterization. Even if our new detection is a brown dwarf, the discovery helps exoplanet studies as a benchmark object for atmosphere modeling and testing evolutionary models based on dynamical-mass derivation.

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