Redevelopment of Polarimetry Mode for NIC

• Takahashi Jun

  Nishi-Harima Astronomical Observatory, Center for Astronomy, University of Hyogo

• Zenno Takahiro

  Miyako Electronics

• Saito Tomoki

  Nishi-Harima Astronomical Observatory, Center for Astronomy, University of Hyogo

• Itoh Yoichi

  Nishi-Harima Astronomical Observatory, Center for Astronomy, University of Hyogo

Bibliographic Information

Other Title

• NIC 偏光観測モードの再開発

Abstract

We redeveloped the polarimetry mode for the Nishiharima Infrared Camera (NIC). A calcite polarizing beam displacer was adopted. The holder for the displacer was designed considering anisotropy in thermal expansion of calcite. We installed the new polarizing beam displacer into the cryostat in February, 2018. Observations for unpolarized standard stars yielded instrumental (including telescope) polarization degrees of 0.01±0.37% (J), 0.02±0.82% (H), and 0.04±0.39% (Ks). We did not find any significant dependence of the instrumental polarization on either the image position, the rotator’s angle, or the telescope altitude. Our evaluation shows that the NIC has a potential to detect a 1% polarization degree in at least J and Ks bands.

Journal

• Stars and Galaxies

  Stars and Galaxies 1 (0), 17-27, 2018

  Center for Astronomy, University of Hyogo

Keywords

• science instrument
• near-infrared
• polarimetry

Details

• CRID: 1390001288140613760
• NII Article ID: 130007620366
• DOI: 10.32231/starsandgalaxies.1.0_17
• ISSN: 2434270X
• Text Lang: ja
• Data Source:
  • JaLC
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed