POLARIMETRIC IMAGING OF LARGE CAVITY STRUCTURES IN THE PRE-TRANSITIONAL PROTOPLANETARY DISK AROUND PDS 70: OBSERVATIONS OF THE DISK

Journal Article · Wed Oct 10 04:00:00 EDT 2012 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/758/1/L19· OSTI ID:22078497

Hashimoto, J; Hayashi, M ^[1]; Dong, R; Zhu, Z; Brandt, T ^[2]; Kudo, T; Egner, S; Guyon, O; Hayano, Y ^[3]; Honda, M ^[4]; McClure, M K ^[5]; Muto, T ^[6]; Wisniewski, J ^[7]; Abe, L ^[8]; Brandner, W; Carson, J; Feldt, M ^[9]; Fukagawa, M ^[10]; Goto, M ^[11]; others, and

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1. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)
2. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)
3. Subaru Telescope, 650 North A'ohoku Place, Hilo, HI 96720 (United States)
4. Kanagawa University, 2946 Tsuchiya, Hiratsuka, Kanagawa 259-1293 (Japan)
5. Department of Astronomy, University of Michigan, 500 Church Street, 830 Dennison Building, Ann Arbor, MI 48109 (United States)
6. Division of Liberal Arts, Kogakuin University, 1-24-2, Nishi-Shinjuku, Shinjuku-ku, Tokyo 163-8677 (Japan)
7. University of Washington, Seattle, WA 98195 (United States)
8. Laboratoire Hippolyte Fizeau, UMR6525, Universite de Nice Sophia-Antipolis, 28, avenue Valrose, F-06108 Nice Cedex 02 (France)
9. Max Planck Institute for Astronomy, D-69117 Heidelberg (Germany)
10. Osaka University, 1-1, Machikaneyama, Toyonaka, Osaka 560-0043 (Japan)
11. Universitaets-Sternwarte Muenchen, Scheinerstr. 1, D-81679 Munich (Germany)

We present high-resolution H-band polarized intensity (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 {approx}70 AU. Our data show that the geometric center of the disk shifts by {approx}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 {approx}30 to {approx}50 M{sub 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.

• OSTI ID: 22078497
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 758; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
CAVITIES
COMPUTERIZED SIMULATION
DISTANCE
ENERGY SPECTRA
GEOMETRY
IMAGES
MONTE CARLO METHOD
PLANETS
POLARIZATION
PROPER MOTION
PROTOPLANETS
RADIANT HEAT TRANSFER
RESOLUTION
T TAURI STARS