Fine Structures of Giant Planet Forming Regions around a Young Star of AB AUr

Details Fine Structures of Giant Planet Forming Regions around a Young Star of AB AUr Fine Structures of Giant Planet Forming Regions around a Young Star of AB AUr

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010lyot.confe..32h&link_type=abstract

Proceedings of the conference In the Spirit of Lyot 2010: Direct Detection of Exoplanets and Circumstellar Disks. October 25 -

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We present the results of the high-resolution near-infrared dual-beam polarimetry of the circumstellar disk around AB Aur (2.4 Mo) using a new high contrast instrument HiCIAO mounted on the Subaru 8.2 m telescope. As a result of stellar evolution, it is widely known that planets are formed in circumstellar disks around young stars. Thus, investigating the detailed structures of circumstellar disks and their evolutions are of great importance in understanding the nature of planet formation mechanisms. However, since the speckle noise is dominant in the inner disk regions (r <1 arcsec) around bright central young star, the observations at the planet forming radius (r <100 AU) are quite challenging so far. The dual-beam polarimetry enable us to suppress the speckle noise and to approach the inner disk regions tens AU in nearby star forming regions. Thanks to the better polarimetry performance of both the inner working angle (22 AU) and the resolution (9 AU) at the distance of AB Aur, we detect the rich structure including a bumpy double ring and a ring-like gap at the possible giant-planet location. Our results suggest giant-planet formation in the disk and provides essential information for understanding disk instability and planet formation models.

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