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First two-micron imaging polarimetry of beta Pictoris

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Title: First two-micron imaging polarimetry of beta Pictoris
Authors: Tamura, Motohide Browse this author
Fukagawa, Misato Browse this author
Kimura, Hiroshi Browse this author
Yamamoto, Tetsuo Browse this author →KAKEN DB
Suto, Hiroshi Browse this author
Abe, Lyu Browse this author
Keywords: circumstellar matter
infrared: stars
planetary system: protoplanetary disks
stars: individual (βPic)
Issue Date: 20-Apr-2006
Journal Title: The astrophysical journal. Part 1
Volume: 641
Issue: 2
Start Page: 1172
End Page: 1177
Publisher DOI: 10.1086/500575
Abstract: 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
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山本 哲生

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