Masayuki Kuzuhara

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023 Protoplanetary disks are believed to be the birthplaces of planets [1]. Among them, disks which have substantial infrared excesses but reduced uxes at wavelengths < 20 µm, i.e., transitional disks [2], could be related to the early phases of planet formation [3] and are therefore particularly important for understanding how, where, and when planets(More)
We present results from the first three years of observations of moving group (MG) targets in the Strategic Exploration of Exoplanets and Disks with Subaru (SEEDS) high-contrast imaging survey of exoplanets and disks using the Subaru telescope. We achieve typical contrasts of ∼10 5 at 1 and ∼10 6 beyond 2 around 63 proposed members of nearby kinematic MGs.(More)
057 We report high-resolution (0.07 arcsec) near-infrared polarized intensity images of the circumstellar disk around the star 2MASS J16042165-2130284 obtained with HiCIAO mounted on the Subaru 8.2 m telescope [1]. We present our H-band data, which clearly exhibits a resolved, face-on disk with a large inner hole for the first time at infrared wavelengths(More)
Studies of the structure and evolution of protoplanetary disks are important for understanding star and planet formation. Here we present the direct image of an interacting binary protoplanetary system. Both circumprimary and circumsecondary disks are resolved in the near-infrared. There is a bridge of infrared emission connecting the two disks and a long(More)
We present high-contrast images of HR 4796 A taken with Subaru/HiCIAO in the H band, resolving the debris disk in scattered light. The application of specialized angular differential imaging methods allows us to trace the inner edge of the disk with high precision and reveals a pair of " streamers " extending radially outward from the ansae. Using a simple(More)
HiCIAO is a high contrast instrument which works with a 188 element adaptive optics system (AO188) for the Subaru Telescope. The instrument is specifically designed for extrasolar planet search and studies of proto-planetary or debris disks. A coronagraph technique and some differential observing modes implemented in HiCIAO extract faint objects from the(More)
We present the results of a H− and K−band multi-object and long-slit spectroscopic survey of substellar mass candidates in the outer regions of the Orion Nebula Cluster. The spectra were obtained using MOIRCS on the 8.2-m Subaru telescope and ISLE on the 1.88-m telescope of Okayama Astronomical Observatory. Eight out of twelve spectra show strong water(More)
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