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First two-micron imaging polarimetry of beta Pictoris

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タイトル: First two-micron imaging polarimetry of beta Pictoris
著者: Tamura, Motohide 著作を一覧する
Fukagawa, Misato 著作を一覧する
Kimura, Hiroshi 著作を一覧する
Yamamoto, Tetsuo 著作を一覧する
Suto, Hiroshi 著作を一覧する
Abe, Lyu 著作を一覧する
キーワード: circumstellar matter
infrared: stars
planetary system: protoplanetary disks
stars: individual (βPic)
発行日: 2006年 4月20日
誌名: The astrophysical journal. Part 1
巻: 641
号: 2
開始ページ: 1172
終了ページ: 1177
抄録: High-resolution K-band imaging polarimetry of the βPic dust disk has been conducted with adaptive optics and a coronagraph using the Subaru 8.2 m telescope. Polarization of 10% is detected out to r 120 AU with a centrosymmetric vector pattern around the central star, confirming that the disk is seen as an infrared reflection nebula. We have modeled our near-infrared and previous optical polarization results in terms of dust scattering in the disk and have found that both the degrees of polarization and the radial intensity profiles are well reproduced. We argue that the observed characteristics of the disk dust are consistent with the presence of ice-filled fluffy aggregates consisting of submicron grains in the βPic system. There is a gap around 100 AU in both the intensity and polarization profiles, which suggests a paucity of planetesimals in this region. The radial intensity profile also shows ripple-like structures, which are indicative of the presence of multiple planetesimal belts, as in the case of the M-type Vega-like star AU Mic.
Rights: C2006 The American Astronomical Society. The astrophysical journal. Part 1. vol. 641 p. 1172-1177
Relation (URI):
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 山本 哲生


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