Near-Infrared Polarimetry of the GG Tauri A Binary System
Abstract
A high angular resolution near-infrared polarized-intensity image of the GG Tau A binary system was obtained with the Subaru Telescope. The image shows the circumbinary disk scattering the light from the central binary. The azimuthal profile of the polarized intensity of the circumbinary disk is roughly reproduced by a simple disk model with the Henyey-Greenstein function and the Rayleigh function, indicating small dust grains at the surface of the disk. Combined with a previous observation of the circumbinary disk, our image indicates that the gap structure in the circumbinary disk orbits anti-clockwise, while material in the disk orbit clockwise. We propose a shadow of material located between the central binary and the circumbinary disk. The separations and position angles of the stellar components of the binary in the past 20 years are consistent with the binary orbit with a = 33.4 AU and e = 0.34.
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Cite
@article{arxiv.1508.07834,
title = {Near-Infrared Polarimetry of the GG Tauri A Binary System},
author = {Yoichi Itoh and Yumiko Oasa and Tomoyuki Kudo and Nobuhiko Kusakabe and Jun Hashimoto and Lyu Abe and Wolfgang Brandner and Timothy D. Brandt and Joseph C. Carson and Sebastian Egner and Markus Feldt and Carol A. Grady and Olivier Guyon and Yutaka Hayano and Masahiko Hayashi and Saeko S. Hayashi and Thomas Henning and Klaus W. Hodapp and Miki Ishii and Masanori Iye and Markus Janson and Ryo Kandori and Gillian R. Knapp and Masayuki Kuzuhara and Jungmi Kwon and Taro Matsuo and Michael W. McElwain and Shoken Miyama and Jun-Ichi Morino and Amaya Moro-Martin and Tetsuo Nishimura and Tae-Soo Pyo and Eugene Serabyn and Takuya Suenaga and Hiroshi Suto and Ryuji Suzuki and Yasuhiro H. Takahashi and Naruhisa Takato and Hiroshi Terada and Christian Thalmann and Daigo Tomono and Edwin L. Turner and Makoto Watanabe and John Wisniewski and Toru Yamada and Satoshi Mayama and Thayne Currie and Hideki Takami and Tomonori Usuda and Motohide Tamura},
journal= {arXiv preprint arXiv:1508.07834},
year = {2015}
}
Comments
10 pages, 3 figures