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Proceedings Paper

Coronagraph imager with adaptive optics (CIAO): description and first results
Author(s): Motohide Tamura; Hiroshi Suto; Yoichi Itoh; Noboru Ebizuka; Yoshiyuki Doi; Koji Murakawa; Saeko S. Hayashi; Yumiko Oasa; Hideki Takami; Norio Kaifu
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Paper Abstract

We describe a near-IR coronagraphic camera built for use with the Subaru 8.2-m telescope and its adaptive optics system. The purpose of this instrument CIAO is to obtain high-resolution images of faint objects in close vicinity of bright objects at IR wavelengths. Such a desire is strong in astronomy, especially in the study of companion brown dwarfs and extra-solar planets, circumstellar disks around both young stellar objects and main-sequence stars, jets and outflows form both young stellar objects and main-sequence stars, jets and outflows from both young stars and evolved stars, circumnuclear regions around AGNs, and host galaxies of QSOs. CIAO is a 1-5 micron camera with tow focal plate scales: 22 milli-arcsec/pixel and 11 milli-arcsec/pixel. The camera is equipped with the standard broad-band filters as well as a number of narrow-band filters. Choice of masks, filters and camera lenses and optical alignment with collimator and detector are made with cryogenic motors. CIAO utilizes one ALLADIN II 'science'-grade detector array manufactured by SBRC. Occulting masks whose diameter ranges from 0.1 to 3 arcsec and several types of pupil masks are selectable, all cooled down to about 60 K and the detector is cooled to about 30 K. Also available are a R <EQ 1000 grism with coronagraphic slits and a polarimetric module. We also present preliminary results from the first commissioning run at the Subaru telescope.

Paper Details

Date Published: 16 August 2000
PDF: 9 pages
Proc. SPIE 4008, Optical and IR Telescope Instrumentation and Detectors, (16 August 2000); doi: 10.1117/12.395434
Show Author Affiliations
Motohide Tamura, National Astronomical Observatory of Japan (Japan)
Hiroshi Suto, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Yoichi Itoh, Subaru Telescope/National Astronomical Observatory of Japan (Japan)
Noboru Ebizuka, Communications Research Lab. (Japan)
Yoshiyuki Doi, Subaru Telescope/National Astronomical Observatory Japan (United States)
Koji Murakawa, Univ. of Hertfordshire (United States)
Saeko S. Hayashi, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Yumiko Oasa, Univ. of Tokyo (Japan)
Hideki Takami, National Astronomical Observatory of Japan (United States)
Norio Kaifu, Subaru Telescope/National Astronomical Observatory of Japan (Japan)


Published in SPIE Proceedings Vol. 4008:
Optical and IR Telescope Instrumentation and Detectors
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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