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Hubble Space Telescope ACS Images of the GG Tauri Circumbinary Disk
Hubble Space Telescope Advanced Camera for Surveys images of the youngbinary GG Tauri and its circumbinary disk in V and I bandpasses wereobtained in 2002 and are the most detailed of this system to date. Theyconfirm features previously seen in the disk including a ``gap''apparently caused by shadowing from circumstellar material, anasymmetrical distribution of light about the line of sight on the nearedge of the disk, enhanced brightness along the near edge of the diskdue to forward scattering, and a compact reflection nebula near thesecondary star. New features are seen in the ACS images: two shortfilaments along the disk, localized but strong variations in the diskintensity (``gaplets''), and a ``spur'' or filament extending from thereflection nebulosity near the secondary. The back side of the disk isdetected in the V band for the first time. The disk appears redder thanthe combined light from the stars, which may be explained by a varieddistribution of grain sizes. The brightness asymmetries along the disksuggest that it is asymmetrically illuminated by the stars due toextinction by nonuniform circumstellar material or that the illuminatedsurface of the disk is warped by tidal effects (or perhaps both).Localized, time-dependent brightness variations in the disk are alsoseen.
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