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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 660777.0, MPI für Astronomie / Publikationen_mpia
Discovery of small-scale spiral structures in the disk of SAO 206462 (HD 135344B): Implications for the physical state of the disk from spiral density wave theory
Authors:Muto, T.; Grady, C. A.; Hashimoto, J.; Fukagawa, M.; Hornbeck, J. B.; Sitko, M.; Russell, R.; Werren, C.; Curé, M.; Currie, T.; Ohashi, N.; Okamoto, Y.; Momose, M.; Honda, M.; Inutsuka, S.; Takeuchi, T.; Dong, R.; Abe, L.; Brandner, W.; Brandt, T.; Carson, J.; Egner, S.; Feldt, M.; Fukue, T.; Goto, M.; Guyon, O.; Hayano, Y.; Hayashi, M.; Hayashi, S.; Henning, T.; Hodapp, K. W.; Ishii, M.; Iye, M.; Janson, M.; Kandori, R.; Knapp, G. R.; Kudo, T.; Kusakabe, N.; Kuzuhara, M.; Matsuo, T.; Mayama, S.; McElwain, M. W.; Miyama, S.; Morino, J. -. I.; Moro-Martin, A.; Nishimura, T.; Pyo, T. -. S.; Serabyn, E.; Suto, H.; Suzuki, R.; Takami, M.; Takato, N.; Terada, H.; Thalmann, C.; Tomono, D.; Turner, E. L.; Watanabe, M.; Wisniewski, J. P.; Yamada, T.; Takami, H.; Usuda, T.; Tamura, M.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:The Astrophysical Journal Letters
Issue / Number:2
Start Page:id. L22
Audience:Not Specified
Abstract / Description:We present high-resolution, H-band imaging observations, collected with Subaru/HiCIAO, of the scattered light from the transitional disk around SAO 206462 (HD 135344B). Although previous sub-mm imagery suggested the existence of a dust-depleted cavity at r <= 46 AU, our observations reveal the presence of scattered light components as close as 0farcs2 (~ 28 AU) from the star. Moreover, we have discovered two small-scale spiral structures lying within 0farcs5 (~ 70 AU). We present models for the spiral structures using the spiral density wave theory, and derive a disk aspect ratio of h ~ 0.1, which is consistent with previous sub-mm observations. This model can potentially give estimates of the temperature and rotation profiles of the disk based on dynamical processes, independently from sub-mm observations. It also predicts the evolution of the spiral structures, which can be observable on timescales of 10-20 years, providing conclusive tests of the model. While we cannot uniquely identify the origin of these spirals, planets embedded in the disk may be capable of exciting the observed morphology. Assuming that this is the case, we can make predictions on the locations and, possibly, the masses of the unseen planets. Such planets may be detected by future multi-wavelength observations. Based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
Free Keywords:circumstellar matter; instrumentation: high angular resolution; polarization; protoplanetary disks; stars: individual: SAO 206462 HD 135344B; waves
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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