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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 11.0 mag 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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Murakawa et al. (2004) studied this question.
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