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We report the direct imaging discovery of a low-mass companion to the nearbyaccelerating A star, HIP 109427, with the Subaru Coronagraphic Extreme AdaptiveOptics (SCExAO) instrument coupled with the MKID Exoplanet Camera (MEC) andCHARIS integral field spectrograph. CHARIS data reduced with reference star PSFsubtraction yield 1.1-2.4 $\mu$m spectra. MEC reveals the companion in $Y$ and$J$ band at a comparable signal-to-noise ratio using stochastic specklediscrimination, with no PSF subtraction techniques. Combined with complementaryfollow-up $L_{\rm p}$ photometry from Keck/NIRC2, the SCExAO data favors aspectral type, effective temperature, and luminosity of M4-M5.5, 3000-3200 $K$,and $\log_{10}(L/L_{\rm \odot}) = -2.28^{+0.04}_{-0.04}$, respectively.Relative astrometry of HIP 109427 B from SCExAO/CHARIS and Keck/NIRC2, andcomplementary Gaia-Hipparcos absolute astrometry of the primary favor asemimajor axis of $6.55^{+3.0}_{-0.48}$ au, an eccentricity of$0.54^{+0.28}_{-0.15}$, an inclination of $66.7^{+8.5}_{-14}$ degrees, and adynamical mass of $0.280^{+0.18}_{-0.059}$ $M_{\odot}$. This work shows thepotential for extreme AO systems to utilize speckle statistics in addition towidely-used post-processing methods to directly image faint companions tonearby stars near the telescope diffraction limit.

the astronomical journal

SCExAO/MEC and CHARIS Discovery of a Low Mass, 6 AU-Separation Companion  to HIP 109427 using Stochastic Speckle Discrimination and High-Contrast  Spectroscopy