Thermal-infrared adaptive optics imaging- and spectro-polarimetry with the Infrared Camera and Spectrograph (IRCS) for the Subaru Telescope

Hiroshi Terada; Mitsuhiko Honda; Takashi Hattori; Tomoyuki Kudo; Jun Hashimoto; Makoto Watanabe

doi:10.1117/12.2313303

6 July 2018 Thermal-infrared adaptive optics imaging- and spectro-polarimetry with the Infrared Camera and Spectrograph (IRCS) for the Subaru Telescope

Hiroshi Terada, Mitsuhiko Honda, Takashi Hattori, Tomoyuki Kudo, Jun Hashimoto, Makoto Watanabe

Author Affiliations +

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 107022Y (2018) https://doi.org/10.1117/12.2313303
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

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Hiroshi Terada, Mitsuhiko Honda, Takashi Hattori, Tomoyuki Kudo, Jun Hashimoto, and Makoto Watanabe "Thermal-infrared adaptive optics imaging- and spectro-polarimetry with the Infrared Camera and Spectrograph (IRCS) for the Subaru Telescope", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107022Y (6 July 2018); https://doi.org/10.1117/12.2313303

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KEYWORDS

Polarimetry

Polarization

Telescopes

Infrared telescopes

Infrared radiation

Stars

Adaptive optics

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