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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 660923.0, MPI für Astronomie / Publikationen_mpia
Polarimetric imaging of large cavity structures in the pre-transitional protoplanetary disk around PDS 70: Observations of the disk
Authors:Hashimoto, J.; Dong, R.; Kudo, T.; Honda, M.; McClure, M. K.; Zhu, Z.; Muto, T.; Wisniewski, J.; Abe, L.; Brandner, W.; Brandt, T.; Carson, J.; Egner, S.; Feldt, M.; Fukagawa, M.; Goto, M.; Grady, C. A.; Guyon, O.; Hayano, Y.; Hayashi, M.; Hayashi, S.; Henning, T.; Hodapp, K.; Ishii, M.; Iye, M.; Janson, M.; Kandori, R.; Knapp, G.; Kusakabe, N.; Kuzuhara, M.; Kwon, J.; Matsuo, T.; Mayama, S.; McElwain, M. W.; Miyama, S.; Morino, J. -. I.; Moro-Martin, A.; Nishimura, T.; Pyo, T. -. S.; Serabyn, G.; Suenaga, T.; Suto, H.; Suzuki, R.; Takahashi, Y.; Takami, M.; Takato, N.; Terada, H.; Thalmann, C.; Tomono, D.; Turner, E. L.; Watanabe, M.; Yamada, T.; Takami, H.; Usuda, T.; Tamura, M.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:The Astrophysical Journal Letters
Volume:758
Issue / Number:1
Start Page:id. L19
Audience:Not Specified
Abstract / Description:We present high-resolution H-band polarized intensity (FWHM = 0farcs1: 14 AU) and L'-band imaging data (FWHM = 0farcs11: 15 AU) of the circumstellar disk around the weak-lined T Tauri star PDS 70 in Centaurus at a radial distance of 28 AU (0farcs2) up to 210 AU (1farcs5). In both images, a giant inner gap is clearly resolved for the first time, and the radius of the gap is ~70 AU. Our data show that the geometric center of the disk shifts by ~6 AU toward the minor axis. We confirm that the brown dwarf companion candidate to the north of PDS 70 is a background star based on its proper motion. As a result of spectral energy distribution fitting by Monte Carlo radiative transfer modeling, we infer the existence of an optically thick inner disk at a few AU. Combining our observations and modeling, we classify the disk of PDS 70 as a pre-transitional disk. Furthermore, based on the analysis of L'-band imaging data, we put an upper limit of ~30 to ~50 M J on the mass of companions within the gap. Taking into account the presence of the large and sharp gap, we suggest that the gap could be formed by dynamical interactions of sub-stellar companions or multiple unseen giant planets in the gap. Based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
Free Keywords:planetary systems; polarization; protoplanetary disks; stars: individual: PDS 70; stars: pre-main sequence
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2012ApJ...758L..19H
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