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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 720087.0, MPI für Astronomie / Publikationen_mpia
Detailed structure of the outer disk around HD 169142 with polarized light in H-band
Authors:Momose, M.; Morita, A.; Fukagawa, M.; Muto, T.; Takeuchi, T.; Hashimoto, J.; Honda, M.; Kudo, T.; Okamoto, Y. K.; Kanagawa, K. D.; Tanaka, H.; Grady, C. A.; Sitko, M. L.; Akiyama, E.; Currie, T.; Follette, K. B.; Mayama, S.; Kusakabe, N.; Abe, L.; Brandner, W.; Brandt, T. D.; Carson, J. C.; Egner, S.; Feldt, M.; Goto, M.; Guyon, O.; Hayano, Y.; Hayashi, M.; Hayashi, S. S.; Henning, T.; Hodapp, K. W.; Ishii, M.; Iye, M.; Janson, M.; Kandori, R.; Knapp, G. R.; Kuzuhara, M.; Kwon, J.; Matsuo, T.; McElwain, M. W.; Miyama, S.; Morino, J.-I.; Moro-Martin, A.; Nishimura, T.; Pyo, T.-S.; Serabyn, E.; Suenaga, T.; Suto, H.; Suzuki, R.; Takahashi, Y. H.; Takami, M.; Takato, N.; Terada, H.; Thalmann, C.; Tomono, D.; Turner, E. L.; Watanabe, M.; Wisniewski, J.; Yamada, T.; Takami, H.; Usuda, T.; Tamura, M.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Publications of the Astronomical Society of Japan
Issue / Number:5
Start Page:id. 83 (16 pp)
Audience:Not Specified
Abstract / Description: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.
Free Keywords:infrared: planetary systems; planet-disk interactions; protoplanetary disks; stars: individual (HD 169142); stars: pre-main-sequence
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6264 %R 10.1093/pasj/psv051
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