CIAO: Coronagraphic Imager with Adaptive Optics on the Subaru Telescope

Details CIAO: Coronagraphic Imager with Adaptive Optics on the Subaru Telescope CIAO: Coronagraphic Imager with Adaptive Optics on the Subaru Telescope

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56..509m&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.56, No.3, pp. 509-519

Astronomy and Astrophysics

Astronomy

23

Instrumentation: Coronagraph, Instrumentation: Polarimetry

Scientific paper

We present the performances of direct imaging with adaptive optics, coronagraph, and imaging-polarimetry of the coronagraphic imager with adaptive optics (CIAO) for the Subaru telescope. Combining with the 36-element adaptive optics system, CIAO produces high-resolution images with a full width at half maximum of 0''.072 and a Strehl ratio of 0.28 in the K band. CIAO has a Lyot's-type stellar coronagraph facility with 0''.1 to 4''.0 diameter masks. The limiting magnitude difference of a companion star at the K band is 11.0mag at 5 σ, 10 minutes integration time, and 2''.0 separation from the central star. CIAO also has a polarimetry facility with a rotatable half-wave plate and a wire grid polarizer. Currently, the measurement of JHK band linear polarization is available.

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