A Resolved Near-Infrared Image of The Inner Cavity in The GM Aur Transitional Disk

Bibliographic Details
Title: A Resolved Near-Infrared Image of The Inner Cavity in The GM Aur Transitional Disk
Authors: Oh, Daehyeon, Hashimoto, Jun, Carson, Joseph C., Janson, Markus, Kwon, Jungmi, Nakagawa, Takao, Mayama, Satoshi, Uyama, Taichi, Yang, Yi, Kudo, Tomoyuki, Kusakabe, Nobuhiko, Abe, Lyu, Akiyama, Eiji, Brandner, Wolfgang, Brandt, Timothy D., Currie, Thayne, Feldt, Markus, Goto, Miwa, Grady, Carol A., Guyon, Olivier, Hayano, Yutaka, Hayashi, Masahiko, Hayashi, Saeko S., Henning, Thomas, Hodapp, Klaus W., Ishii, Miki, Iye, Masanori, Kandori, Ryo, Knapp, Gillian R., Kuzuhara, Masayuki, Matsuo, Taro, Mcelwain, Michael W., Miyama, Shoken, Morino, Jun-Ichi, Moro-Martin, Amaya, Nishimura, Tetsuo, Pyo, Tae-Soo, Serabyn, Eugene, Suenaga, Takuya, Suto, Hiroshi, Suzuki, Ryuji, Takahashi, Yasuhiro H., Takato, Naruhisa, Terada, Hiroshi, Thalmann, Christian, Turner, Edwin L., Watanabe, Makoto, Takami, Hideki, Usuda, Tomonori, Tamura, Motohide
Source: The Astrophysical Journal Letters, 831, L7 (2016)
Publication Year: 2016
Collection: Astrophysics
Subject Terms: Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics
More Details: 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 3-4M_Jup planet about 20 au away from the star, near the edge of the cavity. The presence of a near-infrared inner 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.
Comment: 12 pages, 3 figures, Accepted for publication in ApJ Letters
Document Type: Working Paper
DOI: 10.3847/2041-8205/831/1/L7
Access URL: http://arxiv.org/abs/1610.03913
Accession Number: edsarx.1610.03913
Database: arXiv
More Details
DOI:10.3847/2041-8205/831/1/L7