First Two-Micron Imaging Polarimetry of Beta Pictoris

Details First Two-Micron Imaging Polarimetry of Beta Pictoris First Two-Micron Imaging Polarimetry of Beta Pictoris

2006-03-14

arxiv.org/abs/astro-ph/0603344v1

Astrophys.J. 641 (2006) 1172-1177

Astronomy and Astrophysics

Astrophysics

18 pages, 6 figures, accepted for JpJ

Scientific paper

10.1086/500575

High-resolution K band imaging polarimetry of the beta Pic 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 centro-symmetric 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 beta Pic 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.

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