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Thermal-infrared adaptive optics imaging- and spectro-polarimetry with the Infrared Camera and Spectrograph (IRCS) for the Subaru Telescope
Author(s): Hiroshi Terada; Mitsuhiko Honda; Takashi Hattori; Tomoyuki Kudo; Jun Hashimoto; Makoto Watanabe
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Paper Abstract

A thermal-infrared polarimetric capability of the Infrared Camera and Spectrograph (IRCS) for the Subaru Telescope is described. A new half-wave retarder for the thermal-infrared band in 2–5 µm is introduced into the Waveplate Unit of the Nasmyth platform on the infrared side of the telescope to realize imaging- and low resolution spectro-polarimetry in that wavelength region. Through day-time calibrations using a wire-grid polarizer, the peak efficiency of the polarization is found to be 90-98% consistently in both imaging- and spectro- polarimetry in the thermal-infrared bands. In 2016 May and 2017 June, two engineering observing runs have been carried out to verify the on-sky performance.

Paper Details

Date Published: 6 July 2018
PDF: 11 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107022Y (6 July 2018); doi: 10.1117/12.2313303
Show Author Affiliations
Hiroshi Terada, Thirty Meter Telescope (United States)
National Astronomical Observatory of Japan (Japan)
Mitsuhiko Honda, Kurume Univ. of School of Medicine (Japan)
Takashi Hattori, Subaru Telescope, NAOJ (United States)
Tomoyuki Kudo, Subaru Telescope, NAOJ (United States)
Jun Hashimoto, Astrobiology Ctr., National Institutes of Natural Sciences (Japan)
Makoto Watanabe, Okayama Univ. of Science (Japan)

Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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