Coronagraph imager with adaptive optics (CIAO): description and first results

Motohide Tamura; Hiroshi Suto; Yoichi Itoh; Noboru Ebizuka; Yoshiyuki Doi; Koji Murakawa; Saeko S. Hayashi; Yumiko Oasa; Hideki Takami; Norio Kaifu

doi:10.1117/12.395434

16 August 2000 Coronagraph imager with adaptive optics (CIAO): description and first results

Motohide Tamura, Hiroshi Suto, Yoichi Itoh, Noboru Ebizuka, Yoshiyuki Doi, Koji Murakawa, Saeko S. Hayashi, Yumiko Oasa, Hideki Takami, Norio Kaifu

Author Affiliations +

Proceedings Volume 4008, Optical and IR Telescope Instrumentation and Detectors; (2000) https://doi.org/10.1117/12.395434
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

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.

Citation Download Citation

Motohide Tamura, Hiroshi Suto, Yoichi Itoh, Noboru Ebizuka, Yoshiyuki Doi, Koji Murakawa, Saeko S. Hayashi, Yumiko Oasa, Hideki Takami, and Norio Kaifu "Coronagraph imager with adaptive optics (CIAO): description and first results", Proc. SPIE 4008, Optical and IR Telescope Instrumentation and Detectors, (16 August 2000); https://doi.org/10.1117/12.395434

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