1. Polarimetric imaging of large cavity structures in the pre-transitional protoplanetary disk around PDS 70: observations of the disk
- Author
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Michael W. McElwain, Tomonori Usuda, Mitsuhiko Honda, Zhaohuan Zhu, Melissa McClure, Carol A. Grady, Markus Janson, Lyu Abe, Miki Ishii, Yutaka Hayano, Masao Hayashi, Ryuji Suzuki, Takuya Suenaga, Naruhisa Takato, John P. Wisniewski, Edwin L. Turner, Jungmi Kwon, Christian Thalmann, Klaus W. Hodapp, Yasuhiro H. Takahashi, Taro Matsuo, Michihiro Takami, Tomoyuki Kudo, Gene Serabyn, Timothy D. Brandt, Misato Fukagawa, Shoken Miyama, Masanori Iye, Masayuki Kuzuhara, Hiroshi Terada, Tetsuro Nishimura, Saeko S. Hayashi, Satoshi Mayama, Joseph C. Carson, Ryo Kandori, Makoto Watanabe, Miwa Goto, Markus Feldt, Hideki Takami, Tae-Soo Pyo, Olivier Guyon, Hiroshi Suto, Motohide Tamura, Toru Yamada, G. R. Knapp, Nobuhiko Kusakabe, Jun-Ichi Morino, Jun Hashimoto, Daigo Tomono, Takayuki Muto, Thomas Henning, Sebastian Egner, Amaya Moro-Martin, Wolfgang Brandner, Ruobing Dong, and Low Energy Astrophysics (API, FNWI)
- Subjects
Earth and Planetary Astrophysics (astro-ph.EP) ,Physics ,Proper motion ,010308 nuclear & particles physics ,Monte Carlo method ,Brown dwarf ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics ,Radius ,Protoplanetary disk ,01 natural sciences ,T Tauri star ,Full width at half maximum ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Planet ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics ,Astrophysics - Earth and Planetary Astrophysics - Abstract
We present high resolution H-band polarized intensity (PI; FWHM = 0."1: 14 AU) and L'-band imaging data (FWHM = 0."11: 15 AU) of the circumstellar disk around the weak-lined T Tauri star PDS 70 in Centaurus at a radial distance of 28 AU (0."2) up to 210 AU (1."5). 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 SED 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 mass of companions at ~30 to ~50MJ within the gap. Taking account of 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., accepted by APJL
- Published
- 2012