TY - JOUR
T1 - SCExAO/MEC and CHARIS Discovery of a Low-mass, 6 au Separation Companion to HIP 109427 Using Stochastic Speckle Discrimination and High-contrast Spectroscopy
AU - Steiger, Sarah
AU - Currie, Thayne
AU - Brandt, Timothy D.
AU - Guyon, Olivier
AU - Kuzuhara, Masayuki
AU - Chilcote, Jeffrey
AU - Groff, Tyler D.
AU - Lozi, Julien
AU - Walter, Alexander B.
AU - Fruitwala, Neelay
AU - Bailey,, John I.
AU - Zobrist, Nicholas
AU - Swimmer, Noah
AU - Lipartito, Isabel
AU - Smith, Jennifer Pearl
AU - Bockstiegel, Clint
AU - Meeker, Seth R.
AU - Coiffard, Gregoire
AU - Dodkins, Rupert
AU - Szypryt, Paul
AU - Davis, Kristina K.
AU - Daal, Miguel
AU - Bumble, Bruce
AU - Vievard, Sebastien
AU - Sahoo, Ananya
AU - Deo, Vincent
AU - Jovanovic, Nemanja
AU - Martinache, Frantz
AU - Doppmann, Greg
AU - Tamura, Motohide
AU - Kasdin, N. Jeremy
AU - Mazin, Benjamin A.
N1 - Publisher Copyright:
© 2021. The American Astronomical Society. All rights reserved..
PY - 2021/8
Y1 - 2021/8
N2 - We report the direct imaging discovery of a low-mass companion to the nearby accelerating A star, HIP 109427, with the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument coupled with the Microwave Kinetic Inductance Detector Exoplanet Camera (MEC) and CHARIS integral field spectrograph. CHARIS data reduced with reference star point spread function (PSF) subtraction yield 1.1-2.4 μm spectra. MEC reveals the companion in Y and J band at a comparable signal-to-noise ratio using stochastic speckle discrimination, with no PSF subtraction techniques. Combined with complementary follow-up L p photometry from Keck/NIRC2, the SCExAO data favors a spectral type, effective temperature, and luminosity of M4-M5.5, 3000-3200 K, and, respectively. Relative astrometry of HIP 109427 B from SCExAO/CHARIS and Keck/NIRC2, and complementary Gaia-Hipparcos absolute astrometry of the primary favor a semimajor axis of 6.55+3.0-0.48 au, an eccentricity of M o˙. This work shows the potential for extreme AO systems to utilize speckle statistics in addition to widely used postprocessing methods to directly image faint companions to nearby stars near the telescope diffraction limit.
AB - We report the direct imaging discovery of a low-mass companion to the nearby accelerating A star, HIP 109427, with the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument coupled with the Microwave Kinetic Inductance Detector Exoplanet Camera (MEC) and CHARIS integral field spectrograph. CHARIS data reduced with reference star point spread function (PSF) subtraction yield 1.1-2.4 μm spectra. MEC reveals the companion in Y and J band at a comparable signal-to-noise ratio using stochastic speckle discrimination, with no PSF subtraction techniques. Combined with complementary follow-up L p photometry from Keck/NIRC2, the SCExAO data favors a spectral type, effective temperature, and luminosity of M4-M5.5, 3000-3200 K, and, respectively. Relative astrometry of HIP 109427 B from SCExAO/CHARIS and Keck/NIRC2, and complementary Gaia-Hipparcos absolute astrometry of the primary favor a semimajor axis of 6.55+3.0-0.48 au, an eccentricity of M o˙. This work shows the potential for extreme AO systems to utilize speckle statistics in addition to widely used postprocessing methods to directly image faint companions to nearby stars near the telescope diffraction limit.
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U2 - 10.3847/1538-3881/ac02cc
DO - 10.3847/1538-3881/ac02cc
M3 - Article
AN - SCOPUS:85110548214
VL - 162
JO - Astronomical Journal
JF - Astronomical Journal
SN - 0004-6256
IS - 2
M1 - 44
ER -