Detailed structure of the outer disk around HD 169142 with polarized light in H-band

Munetake Momose, Ayaka Morita, Misato Fukagawa, Takayuki Muto, Taku Takeuchi, Jun Hashimoto, Mitsuhiko Honda, Tomoyuki Kudo, Yoshiko K. Okamoto, Kazuhiro D. Kanagawa, Hidekazu Tanaka, Carol A. Grady, Michael L. Sitko, Eiji Akiyama, Thayne Currie, Katherine B. Follette, Satoshi Mayama, Nobuhiko Kusakabe, Lyu Abe, Wolfgang BrandnerTimothy D. Brandt, Joseph C. Carson, Sebastian Egner, Markus Feldt, Miwa Goto, Olivier Guyon, Yutaka Hayano, Masahiko Hayashi, Saeko S. Hayashi, Thomas Henning, Klaus W. Hodapp, Miki Ishii, Masanori Iye, Markus Janson, Ryo Kandori, Gillian R. Knapp, Masayuki Kuzuhara, Jungmi Kwon, Taro Matsuo, Michael W. Mcelwain, Shoken Miyama, Jun Ichi Morino, Amaya Moro-Martin, Tetsuo Nishimura, Tae Soo Pyo, Eugene Serabyn, Takuya Suenaga, Hiroshi Suto, Ryuji Suzuki, Yasuhiro H. Takahashi, Michihiro Takami, Naruhisa Takato, Hiroshi Terada, Christian Thalmann, Daigo Tomono, Edwin L. Turner, Makoto Watanabe, John Wisniewski, Toru Yamada, Hideki Takami, Tomonori Usuda, Motohide Tamura

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34 Scopus citations

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 λ = 7 mm. This can be regarded as another sign of a protoplanet in the TZ. The observed radial profile of the PI is reproduced by a minimally flaring disk with an irregular surface density distribution, an irregular temperature distribution, or with a 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 a shadowing effect by a puffed-up structure in the inner power-law region.

Original languageEnglish (US)
Article number83
JournalPublications of the Astronomical Society of Japan
Volume67
Issue number5
DOIs
StatePublished - Jun 30 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • infrared: planetary systems
  • planet disk interactions
  • protoplanetary disks
  • stars: individual (HD 169142)
  • stars: pre-main-sequence

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