We propose to use SCExAO+VAMPIRES polarization differential imaging mode with the Hα narrow-band filter to identify the Hα emission at the location of the protoplanet AB Aur b we discovered. The previous detection of Hα was made from VAMPIRES total intensity high-contrast imaging and there still remains a degeneracy between a signature of the active mass accretion onto AB Aur b or scattered light from AB Aur. As our CHARIS observations could constrain the scattered light scenario at near-infrared wavelengths by comparing total intensity and polarized intensity, we will be able to constrain the scattered light scenario at Hα from the proposed observations. We will also take advantage of the simultaneous use of CHARIS integral field spectroscopy to confirm that the VAMPIRES detection is coincident with the CHARIS result with higher SNRs than Currie et al. (2022).
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