Detailed structure of the outer disk around HD 169142 with polarized light in H-band
Abstract
Coronagraphic imagery of the circumstellar disk around HD 169142 in H-band polarized intensity (PI) with Subaru/HiCIAO is presented. The emission scattered by dust particles at the disk surface in 0.2" <= r <= 1.2", or 29 <= r <= 174 AU, is successfully detected. The azimuthally-averaged radial profile of the PI shows a double power-law distribution, in which the PIs in r=29-52 AU and r=81.2-145 AU respectively show r^{-3}-dependence. These two power-law regions are connected smoothly with a transition zone (TZ), exhibiting an apparent gap in r=40-70 AU. The PI in the inner power-law region shows a deep minimum whose location seems to coincide with the point source at \lambda = 7 mm. This can be regarded as another sign of a protoplanet in TZ. The observed radial profile of the PI is reproduced by a minimally flaring disk with an irregular surface density distribution or with an irregular temperature distribution or with the combination of both. The depletion factor of surface density in the inner power-law region (r< 50 AU) is derived to be <= 0.16 from a simple model calculation. The obtained PI image also shows small scale asymmetries in the outer power-law region. Possible origins for these asymmetries include corrugation of the scattering surface in the outer region, and shadowing effect by a puffed up structure in the inner power-law region.
Keywords
Cite
@article{arxiv.1505.04937,
title = {Detailed structure of the outer disk around HD 169142 with polarized light in H-band},
author = {Munetake Momose and Ayaka Morita and Misato Fukagawa and Takayuki Muto and Taku Takeuchi and Jun Hashimoto and Mitsuhiko Honda and Tomoyuki Kudo and Yoshiko K. Okamoto and Kazuhiro D. Kanagawa and Hidekazu Tanaka and Carol A. Grady and Michael L. Sitko and Eiji Akiyama and Thayne Currie and Katherine B. Follette and Satoshi Mayama and Nobuhiko Kusakabe and Lyu Abe and Wolfgang Brandner and Timothy D. Brandt and Joseph C. Carson and Sebastian Egner and Markus Feldt and Miwa Goto 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 Michihiro Takami 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 Hideki Takami and Tomonori Usuda and Motohide Tamura},
journal= {arXiv preprint arXiv:1505.04937},
year = {2015}
}
Comments
26 pages, 7 figures, accepted for publication in PASJ