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arXiv · 1411.0671

SEEDS Adaptive Optics Imaging of the Asymmetric Transition Disk Oph IRS 48 in Scattered Light

Katherine B. Follette·Carol A. Grady·Jeremy R. Swearingen·Michael L. Sitko·Elizabeth H. Champney·Nienke van der Marel·Michihiro Takami·Marc J. Kuchner·Laird M. Close·Takayuki Muto·Satoshi Mayama·Michael W. McElwain·Misato Fukagawa·Koen Maaskant·Michiel Min·Ray W. Russell·Tomoyuki Kudo·Nobuhiko Kusakabe·Jun Hashimoto·Lyu Abe·Eiji Akiyama·Wolfgang Brandner·Timothy D. Brandt·Joseph Carson·Thayne Currie·Sebastian E. Egner·Markus Feldt·Miwa Goto·Olivier Guyon·Yutaka Hayano·Masahiko Hayashi·Saeko Hayashi·Thomas Henning·Klaus Hodapp·Miki Ishii·Masanori Iye·Markus Janson·Ryo Kandori·Gillian R. Knapp·Masayuki Kuzuhara·Jungmi Kwon·Taro Matsuo·Shoken Miyama·Jun-Ichi Morino·Amaya Moro-Martin·Tetsuo Nishimura·Tae-Soo Pyo·Eugene Serabyn·Takuya Suenaga·Hiroshi Suto·Ryuji Suzuki·Yasuhiro Takahashi·Naruhisa Takato·Hiroshi Terada·Christian Thalmann·Daigo Tomono·Edwin L. Turner·Makoto Watanabe·John P. Wisniewski·Toru Yamada·Hideki Takami·Tomonori Usuda·Motohide Tamura
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Abstract

We present the first resolved near infrared imagery of the transition disk Oph IRS 48 (WLY 2-48), which was recently observed with ALMA to have a strongly asymmetric sub-millimeter flux distribution. H-band polarized intensity images show a $\sim$60AU radius scattered light cavity with two pronounced arcs of emission, one from Northeast to Southeast and one smaller, fainter and more distant arc in the Northwest. K-band scattered light imagery reveals a similar morphology, but with a clear third arc along the Southwestern rim of the disk cavity. This arc meets the Northwestern arc at nearly a right angle, revealing the presence of a spiral arm or local surface brightness deficit in the disk, and explaining the East-West brightness asymmetry in the H-band data. We also present 0.8-5.4$\mu$m IRTF SpeX spectra of this object, which allow us to constrain the spectral class to A0$\pm$1 and measure a low mass accretion rate of 10$^{-8.5}$M$_{\odot}$/yr, both consistent with previous estimates. We investigate a variety of reddening laws in order to fit the mutliwavelength SED of Oph IRS 48 and find a best fit consistent with a younger, higher luminosity star than previous estimates.

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Katherine B. Follette, Carol A. Grady, Jeremy R. Swearingen, Michael L. Sitko, Elizabeth H. Champney, Nienke van der Marel, Michihiro Takami, Marc J. Kuchner, Laird M. Close, Takayuki Muto, Satoshi Mayama, Michael W. McElwain, Misato Fukagawa, Koen Maaskant, Michiel Min, Ray W. Russell, Tomoyuki Kudo, Nobuhiko Kusakabe, Jun Hashimoto, Lyu Abe, Eiji Akiyama, Wolfgang Brandner, Timothy D. Brandt, Joseph Carson, Thayne Currie, Sebastian E. Egner, Markus Feldt, Miwa Goto, Olivier Guyon, Yutaka Hayano, Masahiko Hayashi, Saeko Hayashi, Thomas Henning, Klaus Hodapp, Miki Ishii, Masanori Iye, Markus Janson, Ryo Kandori, Gillian R. Knapp, Masayuki Kuzuhara, Jungmi Kwon, Taro Matsuo, Shoken Miyama, Jun-Ichi Morino, Amaya Moro-Martin, Tetsuo Nishimura, Tae-Soo Pyo, Eugene Serabyn, Takuya Suenaga, Hiroshi Suto, Ryuji Suzuki, Yasuhiro Takahashi, Naruhisa Takato, Hiroshi Terada, Christian Thalmann, Daigo Tomono, Edwin L. Turner, Makoto Watanabe, John P. Wisniewski, Toru Yamada, Hideki Takami, Tomonori Usuda, Motohide Tamura. 2014-11-03. SEEDS Adaptive Optics Imaging of the Asymmetric Transition Disk Oph IRS 48 in Scattered Light. https://doi.org/10.1088/0004-637x/798/2/132

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