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Title: DISCOVERY OF A DISK GAP CANDIDATE AT 20 AU IN TW HYDRAE

We present a new Subaru/HiCIAO high-contrast H-band polarized intensity (PI) image of a nearby transitional disk associated with TW Hydrae. The scattered light from the disk was detected from 0.″ 2 to 1.″ 5 (11–81 AU) and the PI image shows a clear axisymmetric depression in PI at ∼0.″ 4 (∼20 AU) from the central star, similar to the ∼80 AU gap previously reported from Hubble Space Telescope images. The azimuthal PI profile also shows that the disk beyond 0.″ 2 is almost axisymmetric. We discuss two possible scenarios explaining the origin of the PI depression: (1) a gap structure may exist at ∼20 AU from the central star because of a shallow slope seen in the PI profile, and (2) grain growth may be occurring in the inner region of the disk. Multi-band observations at near-infrared and millimeter/submillimeter wavelengths play a complementary role in investigating dust opacity and may help reveal the origin of the gap more precisely.
Authors:
; ;  [1] ;  [2] ; ;  [3] ; ;  [4] ;  [5] ;  [6] ; ;  [7] ;  [8] ;  [9] ;  [10] ; ;  [11] ;  [12] ;  [13] ;  [14] more »; « less
  1. National Astronomical Observatory of Japan, 2-21-1, Osawa, Mitaka, Tokyo 181-8588 (Japan)
  2. Division of Liberal Arts, Kogakuin University, 1-24-2, Nishi-Shinjuku, Shinjuku-ku, Tokyo 163-8677 (Japan)
  3. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1, Oklahoma, Ookayama, Meguro-ko, Tokyo 152-8551 (Japan)
  4. Department of Physics and Astronomy, The University of Oklahoma, 440 W. Brooks Street, Norman, OK 73019 (United States)
  5. College of Science, Ibaraki University, 2-1-1, Bunkyo, Mito, Ibaraki 310-8512 (Japan)
  6. Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)
  7. Subaru Telescope, National Astronomical Observatory of Japan, 650, North A'ohoku Place, Hilo, HI 96720 (United States)
  8. Eureka Scientific, 2452 Delmer, Suite 100, Oakland, CA 96002 (United States)
  9. Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan (China)
  10. Department of Astronomy, Stockholm University, AlbaNova University Center, Stockholm, SE-106 91 (Sweden)
  11. Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg (Germany)
  12. Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301 (United States)
  13. The Center for the Promotion of Integrated Sciences, The Graduate University for Advance Studies, Shonan International Village, Hayama-cho, Miura-gun, Kanagawa 240-0115 (Japan)
  14. Institute for Astronomy, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich (Switzerland)
Publication Date:
OSTI Identifier:
22518830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 802; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AXIAL SYMMETRY; COSMIC DUST; GRAIN GROWTH; IMAGES; INTERSTELLAR GRAINS; OPACITY; PROTOPLANETS; SPACE; STARS; TELESCOPES; VISIBLE RADIATION