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Near-Infrared Imaging Polarimetry of LkCa 15: A Possible Warped Inner Disk

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arxiv 1601.00742 v4 pith:R4BPUFS6 submitted 2016-01-05 astro-ph.EP

Near-Infrared Imaging Polarimetry of LkCa 15: A Possible Warped Inner Disk

Daehyeon Oh , Jun Hashimoto , Motohide Tamura , John Winsiewski , Eiji Akiyama , Thayne Currie , Satoshi Mayama , Michihiro Takami
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Christian Thalmann Tomoyuki Kudo Nobuhiko Kusakabe Lyu Abe Wolfgang Brandner Timothy D. Brandt Joseph C. Carson Sebastian Egner Markus Feldt Miwa Goto Carol A. Grady Olivier Guyon Yutaka Hayano Masahiko Hayashi Saeko S. Hayashi Thomas Henning Klaus W. Hodapp Miki Ishii Masanori Iye Markus Janson Ryo Kandori Gillian R. Knapp Masayuki Kuzuhara Jungmi Kwon 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 Edwin L. Turner Makoto Watanabe Toru Yamada Hideki Takami Tomonori Usuda
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We present high-contrast H-band polarized intensity images of the transitional disk around the young solar-like star LkCa 15. By utilizing Subaru/HiCIAO for polarimetric differential imaging, both the angular resolution and the inner working angle reach 0.07" and r=0.1", respectively. We obtained a clearly resolved gap (width <~ 27 AU) at ~ 48 AU from the central star. This gap is consistent with images reported in previous studies. We also confirmed the existence of a bright inner disk with a misaligned position angle of 13+/-4 degree with respect to that of the outer disk, i.e., the inner disk is possibly warped. The large gap and the warped inner disk both point to the existence of a multiple planetary system with a mass of <~1Mjup.

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