A RESOLVED NEAR-INFRARED IMAGE of the INNER CAVITY in the GM Aur TRANSITIONAL DISK

Daehyeon Oh, Jun Hashimoto, Joseph C. Carson, Markus Janson, Jungmi Kwon, Takao Nakagawa, Satoshi Mayama, Taichi Uyama, Yi Yang, Tomoyuki Kudo, Nobuhiko Kusakabe, Lyu Abe, Eiji Akiyama, Wolfgang Brandner, Timothy D. Brandt, Thayne Currie, Markus Feldt, Miwa Goto, Carol A. Grady, Olivier GuyonYutaka Hayano, Masahiko Hayashi, Saeko S. Hayashi, Thomas Henning, Klaus W. Hodapp, Miki Ishii, Masanori Iye, Ryo Kandori, Gillian R. Knapp, Masayuki Kuzuhara, Taro Matsuo, Michael W. McElwain, Shoken Miyama, Jun Ichi Morino, Amaya Moro-Martin, Tetsuo Nishimura, Tae Soo Pyo, Eugene Serabyn, Takuya Suenaga, Hiroshi Suto, Ryuji Suzuki, Yasuhiro H. Takahashi, Naruhisa Takato, Hiroshi Terada, Christian Thalmann, Edwin L. Turner, Makoto Watanabe, Toru Yamada, Hideki Takami, Tomonori Usuda, Motohide Tamura

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

We present high-contrast H-band polarized intensity (PI) images of the transitional disk around the young solar-like star GM Aur. The near-infrared direct imaging of the disk was derived by polarimetric differential imaging using the Subaru 8.2 m Telescope and HiCIAO. An angular resolution and an inner working angle of 0.″07 and r ∼ 0.″05, respectively, were obtained. We clearly resolved a large inner cavity, with a measured radius of 18 ±2 au, which is smaller than that of a submillimeter interferometric image (28 au). This discrepancy in the cavity radii at near-infrared and submillimeter wavelengths may be caused by a 3-4 M Jup planet about 20 au away from the star, near the edge of the cavity. The presence of a near-infrared inner cavity is a strong constraint on hypotheses for inner cavity formation in a transitional disk. A dust filtration mechanism has been proposed to explain the large cavity in the submillimeter image, but our results suggest that this mechanism must be combined with an additional process. We found that the PI slope of the outer disk is significantly different from the intensity slope obtained from HST/NICMOS, and this difference may indicate the grain growth process in the disk.

Original languageEnglish (US)
Article numberL7
JournalAstrophysical Journal Letters
Volume831
Issue number1
DOIs
StatePublished - Nov 1 2016
Externally publishedYes

Keywords

  • circumstellar matter
  • protoplanetary disks
  • stars: individual (GM Aur)
  • stars: pre-main sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Oh, D., Hashimoto, J., Carson, J. C., Janson, M., Kwon, J., Nakagawa, T., Mayama, S., Uyama, T., Yang, Y., Kudo, T., Kusakabe, N., Abe, L., Akiyama, E., Brandner, W., Brandt, T. D., Currie, T., Feldt, M., Goto, M., Grady, C. A., ... Tamura, M. (2016). A RESOLVED NEAR-INFRARED IMAGE of the INNER CAVITY in the GM Aur TRANSITIONAL DISK. Astrophysical Journal Letters, 831(1), [L7]. https://doi.org/10.3847/2041-8205/831/1/L7