The top panels compare images taken by HiCIAO and CIAO. Both images have a field of view of 7.5" by 7.5". Top left: Image taken by HiCIAO using a coronagraphic occulting mask with a 0.3" diameter. Top right: Image taken by CIAO using a software mask with a 1.7” diameter. The bottom panels show close-up views of the inner part of AB Aur's disk. Both images have a field of view of 2.0” by 2.0". Bottom left: Image has a coronagraphic occulting mask with a 0.3" diameter. Bottom right: Image includes labels of its prominent features. The central position (0, 0) refers to the location of the star. Ellipsoids in dashed lines show the outer and inner rings. The solid ellipsoid indicates the wide gap between the rings. The "+" shows where the star is. The filled circle is the center of the outer ring.
Subaru Telescope, National Astronomical Observatory of Japan (NAOJ)