SCExAO/MEC and CHARIS Discovery of a Low-mass, 6 au Separation Companion to HIP 109427 Using Stochastic Speckle Discrimination and High-contrast Spectroscopy
- Creators
- Steiger, Sarah
- Currie, Thayne
- Brandt, Timothy D.
- Guyon, Olivier
- Kuzuhara, Masayuki
- Chilcote, Jeffrey
- Groff, Tyler D.
- Lozi, Julien
- Walter, Alexander B.
- Fruitwala, Neelay
- Bailey, III, John I.
- Zobrist, Nicholas
- Swimmer, Noah
- Lipartito, Isabel
- Smith, Jennifer Pearl
- Bockstiegel, Clint
- Meeker, Seth R.
- Coiffard, Gregoire
- Dodkins, Rupert
- Szypryt, Paul
- Davis, Kristina K.
- Daal, Miguel
- Bumble, Bruce
- Vievard, Sebastien
- Sahoo, Ananya
- Deo, Vincent
- Jovanovic, Nemanja
- Martinache, Frantz
- Doppmann, Greg
- Tamura, Motohide
- Kasdin, N. Jeremy
- Mazin, Benjamin A.
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 Lp photometry from Keck/NIRC2, the SCExAO data favors a spectral type, effective temperature, and luminosity of M4–M5.5, 3000–3200 K, and log₁₀(L/L_⊙)= -2.28_(-0.04)^(+0.04), 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 0.54_(-0.15)^(+0.28), an inclination of 66.7_(-14)^(+8.5) degrees, and a dynamical mass of 0.280_(-0.059)^(+0.18) M_⊙. 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.
Additional Information
© 2021. The American Astronomical Society. Received 2021 March 2; revised 2021 April 16; accepted 2021 May 17; published 2021 July 6. S.S. and N.F. are supported by a grant from the Heising-Simons Foundation. K.K.D. is supported by the NSF Astronomy and Astrophysics Postdoctoral Fellowship program under award # 1801983. J.P.S. and N.Z. are both supported by a NASA Space Technology Research Fellowship. I.L. is supported by the National Science Foundation Graduate Research Fellowship under grant # 1650114. T.C. was supported by a NASA Senior Postdoctoral Fellowship and NASA/Keck grant LK-2663-948181. M.T. is supported by JSPS KAKENHI grant # 18H05442, # 15H02063, and # 22000005. We thank the Subaru and NASA Keck Time Allocation Committees for their generous support of this program and Chas Beichman and Dawn Gelino for graciously supporting additional NIRC2 time. This work makes use of the Keck Observatory Archive (KOA), a joint development between the W. M. Keck Observatory and the NASA Exoplanet Science Institute (NExScI). CHARIS was built at Princeton University under a Grant-in-Aid for Scientific Research on Innovative Areas from MEXT of the Japanese government (# 23103002). The development of SCExAO was supported by the Japan Society for the Promotion of Science (Grant-in-Aid for Research #23340051, #26220704, #23103002, #19H00703, and #19H00695), the Astrobiology Center of the National Institutes of Natural Sciences, Japan, the Mt Cuba Foundation and the director's contingency fund at Subaru Telescope. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community, and are most fortunate to have the opportunity to conduct observations from this mountain.Attached Files
Published - Steiger_2021_AJ_162_44.pdf
Submitted - 2103.06898.pdf
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Additional details
- Alternative 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
- Eprint ID
- 109768
- Resolver ID
- CaltechAUTHORS:20210709-222308692
- Heising-Simons Foundation
- AST-1801983
- NSF Astronomy and Astrophysics Fellowship
- NASA Space Technology Research Fellowship
- DGE-1650114
- NSF Graduate Research Fellowship
- NASA Postdoctoral Program
- LK-2663-948181
- NASA
- 18H05442
- Japan Society for the Promotion of Science (JSPS)
- 15H02063
- Japan Society for the Promotion of Science (JSPS)
- 22000005
- Japan Society for the Promotion of Science (JSPS)
- 23103002
- Japan Society for the Promotion of Science (JSPS)
- 23340051
- Japan Society for the Promotion of Science (JSPS)
- 26220704
- Japan Society for the Promotion of Science (JSPS)
- 19H00703
- Japan Society for the Promotion of Science (JSPS)
- 19H00695
- Japan Society for the Promotion of Science (JSPS)
- National Institutes of Natural Sciences of Japan
- Mt. Cuba Foundation
- Subaru Telescope
- Created
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2021-07-09Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field