SCExAO/MEC and CHARIS Discovery of a Low-mass, 6 au Separation Companion to HIP 109427 Using Stochastic Speckle Discrimination and High-contrast Spectroscopy

Sarah Steiger; Thayne Currie; Timothy D. Brandt; Olivier Guyon; Masayuki Kuzuhara; Jeffrey Chilcote; Tyler D. Groff; Julien Lozi; Alexander B. Walter; Neelay Fruitwala; John I. Bailey,; Nicholas Zobrist; Noah Swimmer; Isabel Lipartito; Jennifer Pearl Smith; Clint Bockstiegel; Seth R. Meeker; Gregoire Coiffard; Rupert Dodkins; Paul Szypryt; Kristina K. Davis; Miguel Daal; Bruce Bumble; Sebastien Vievard; Ananya Sahoo; Vincent Deo; Nemanja Jovanovic; Frantz Martinache; Greg Doppmann; Motohide Tamura; N. Jeremy Kasdin; Benjamin A. Mazin

doi:10.3847/1538-3881/ac02cc

SCExAO/MEC and CHARIS Discovery of a Low-mass, 6 au Separation Companion to HIP 109427 Using Stochastic Speckle Discrimination and High-contrast Spectroscopy

Sarah Steiger, Thayne Currie, Timothy D. Brandt, Olivier Guyon, Masayuki Kuzuhara, Jeffrey Chilcote, Tyler D. Groff, Julien Lozi, Alexander B. Walter, Neelay Fruitwala, John I. Bailey,, Nicholas Zobrist, Noah Swimmer, Isabel Lipartito, Jennifer Pearl Smith, Clint Bockstiegel, Seth R. Meeker, Gregoire Coiffard, Rupert Dodkins, Paul SzyprytKristina K. Davis, Miguel Daal, Bruce Bumble, Sebastien Vievard, Ananya Sahoo, Vincent Deo, Nemanja Jovanovic, Frantz Martinache, Greg Doppmann, Motohide Tamura, N. Jeremy Kasdin, Benjamin A. Mazin

Optical Sciences

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

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.

Original language	English (US)
Article number	44
Journal	Astronomical Journal
Volume	162
Issue number	2
DOIs	https://doi.org/10.3847/1538-3881/ac02cc
State	Published - Aug 2021

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-3881/ac02cc

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Steiger, S., Currie, T., Brandt, T. D., Guyon, O., Kuzuhara, M., Chilcote, J., Groff, T. D., Lozi, J., Walter, A. B., Fruitwala, N., Bailey, J. I., Zobrist, N., Swimmer, N., Lipartito, I., Smith, J. P., Bockstiegel, C., Meeker, S. R., Coiffard, G., Dodkins, R., ... Mazin, B. A. (2021). SCExAO/MEC and CHARIS Discovery of a Low-mass, 6 au Separation Companion to HIP 109427 Using Stochastic Speckle Discrimination and High-contrast Spectroscopy. Astronomical Journal, 162(2), [44]. https://doi.org/10.3847/1538-3881/ac02cc

Steiger, S, Currie, T, Brandt, TD, Guyon, O, Kuzuhara, M, Chilcote, J, Groff, TD, Lozi, J, Walter, AB, Fruitwala, N, Bailey, JI, Zobrist, N, Swimmer, N, Lipartito, I, Smith, JP, Bockstiegel, C, Meeker, SR, Coiffard, G, Dodkins, R, Szypryt, P, Davis, KK, Daal, M, Bumble, B, Vievard, S, Sahoo, A, Deo, V, Jovanovic, N, Martinache, F, Doppmann, G, Tamura, M, Kasdin, NJ & Mazin, BA 2021, 'SCExAO/MEC and CHARIS Discovery of a Low-mass, 6 au Separation Companion to HIP 109427 Using Stochastic Speckle Discrimination and High-contrast Spectroscopy', Astronomical Journal, vol. 162, no. 2, 44. https://doi.org/10.3847/1538-3881/ac02cc

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title = "SCExAO/MEC and CHARIS Discovery of a Low-mass, 6 au Separation Companion to HIP 109427 Using Stochastic Speckle Discrimination and High-contrast Spectroscopy",

abstract = "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.",

author = "Sarah Steiger and Thayne Currie and Brandt, {Timothy D.} and Olivier Guyon and Masayuki Kuzuhara and Jeffrey Chilcote and Groff, {Tyler D.} and Julien Lozi and Walter, {Alexander B.} and Neelay Fruitwala and Bailey,, {John I.} and Nicholas Zobrist and Noah Swimmer and Isabel Lipartito and Smith, {Jennifer Pearl} and Clint Bockstiegel and Meeker, {Seth R.} and Gregoire Coiffard and Rupert Dodkins and Paul Szypryt and Davis, {Kristina K.} and Miguel Daal and Bruce Bumble and Sebastien Vievard and Ananya Sahoo and Vincent Deo and Nemanja Jovanovic and Frantz Martinache and Greg Doppmann and Motohide Tamura and Kasdin, {N. Jeremy} and Mazin, {Benjamin A.}",

year = "2021",

month = aug,

doi = "10.3847/1538-3881/ac02cc",

language = "English (US)",

volume = "162",

journal = "Astronomical Journal",

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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.

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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JO - Astronomical Journal

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ER -

SCExAO/MEC and CHARIS Discovery of a Low-mass, 6 au Separation Companion to HIP 109427 Using Stochastic Speckle Discrimination and High-contrast Spectroscopy

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Near-IR spectrum of HIP 109427 with SCExAO/CHARIS

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SCExAO/MEC and CHARIS Discovery of a Low-mass, 6 au Separation Companion to HIP 109427 Using Stochastic Speckle Discrimination and High-contrast Spectroscopy

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ASJC Scopus subject areas

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Near-IR spectrum of HIP 109427 with SCExAO/CHARIS

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