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• W2086827306 abstract "We present a near-infrared image of the Herbig Ae star AB Aur obtained with the Coronagraphic Imager with Adaptive Optics mounted on the Subaru Telescope. The image shows a circumstellar emission extending out to a radius of r = 580 AU, with a double spiral structure detected at r = 200-450 AU. The surface brightness decreases as r-3.0±0.1, steeper than the radial profile of the optical emission possibly affected by the scattered light from the envelope surrounding AB Aur. This result, together with the size of the infrared emission similar to that of the 13CO (J = 1-0) disk, suggests that the spiral structure is indeed associated with the circumstellar disk but is not part of the extended envelope. We identified four major spiral arms, which are trailing if the brighter southeastern part of the disk is the near side. The weak gravitational instability, maintained for millions of years by continuous mass supply from the envelope, might explain the presence of the spiral structure at the relatively late phase of the pre-main-sequence period." @default.
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• W2086827306 date "2004-03-15" @default.
• W2086827306 modified "2023-10-16" @default.
• W2086827306 title "Spiral Structure in the Circumstellar Disk around AB Aurigae" @default.
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• W2086827306 doi "https://doi.org/10.1086/420699" @default.
• W2086827306 hasPublicationYear "2004" @default.
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