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; 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

doi:10.1093/pasj/psv133

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arXiv · 1601.00742

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

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Abstract

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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Daehyeon Oh, Jun Hashimoto, Motohide Tamura, John Winsiewski, Eiji Akiyama, Thayne Currie, Satoshi Mayama, Michihiro Takami, 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. 2016-08-21. Near-Infrared Imaging Polarimetry of LkCa 15: A Possible Warped Inner Disk. https://doi.org/10.1093/pasj%2Fpsv133

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