Discovery of a disk gap candidate at 20 AU in TW Hydrae

E. Akiyama, T. Muto, N. Kusakabe, A. Kataoka, J. Hashimoto, T. Tsukagoshi, J. Kwon, T. Kudo, R. Kandori, C. A. Grady, M. Takami, M. Janson, M. Kuzuhara, T. Henning, M. L. Sitko, J. C. Carson, S. Mayama, T. Currie, C. Thalmann, J. WisniewskiM. Momose, N. Ohashi, L. Abe, W. Brandner, T. D. Brandt, S. Egner, M. Feldt, M. Goto, O. Guyon, Y. Hayano, M. Hayashi, S. Hayashi, K. W. Hodapp, M. Ishi, M. Iye, G. R. Knapp, T. Matsuo, M. W. Mcelwain, S. Miyama, J. I. Morino, A. Moro-Martin, T. Nishimura, T. S. Pyo, G. Serabyn, T. Suenaga, H. Suto, R. Suzuki, Y. H. Takahashi, N. Takato, H. Terada, D. Tomono, E. L. Turner, M. Watanabe, T. Yamada, H. Takami, T. Usuda, M. Tamura

Research output: Contribution to journalArticlepeer-review

57 Scopus citations


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.

Original languageEnglish (US)
Article numberL17
JournalAstrophysical Journal Letters
Issue number2
StatePublished - Apr 1 2015


  • Planetary systems
  • Protoplanetary disks
  • Stars: individual (TW Hydrae)
  • Stars: pre-main sequence
  • Techniques: polarimetric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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