SEEDS Adaptive Optics Imaging of the Asymmetric Transition Disk Oph IRS 48 in Scattered Light
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 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 0.8-5.4m IRTF SpeX spectra of this object, which allow us to constrain the spectral class to A01 and measure a low mass accretion rate of 10M/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.
Keywords
Cite
@article{arxiv.1411.0671,
title = {SEEDS Adaptive Optics Imaging of the Asymmetric Transition Disk Oph IRS 48 in Scattered Light},
author = {Katherine B. Follette and Carol A. Grady and Jeremy R. Swearingen and Michael L. Sitko and Elizabeth H. Champney and Nienke van der Marel and Michihiro Takami and Marc J. Kuchner and Laird M. Close and Takayuki Muto and Satoshi Mayama and Michael W. McElwain and Misato Fukagawa and Koen Maaskant and Michiel Min and Ray W. Russell and Tomoyuki Kudo and Nobuhiko Kusakabe and Jun Hashimoto and Lyu Abe and Eiji Akiyama and Wolfgang Brandner and Timothy D. Brandt and Joseph Carson and Thayne Currie and Sebastian E. Egner and Markus Feldt and Miwa Goto and Olivier Guyon and Yutaka Hayano and Masahiko Hayashi and Saeko Hayashi and Thomas Henning and Klaus Hodapp and Miki Ishii and Masanori Iye and Markus Janson and Ryo Kandori and Gillian R. Knapp and Masayuki Kuzuhara and Jungmi Kwon and Taro Matsuo and Shoken Miyama and Jun-Ichi Morino and Amaya Moro-Martin and Tetsuo Nishimura and Tae-Soo Pyo and Eugene Serabyn and Takuya Suenaga and Hiroshi Suto and Ryuji Suzuki and Yasuhiro Takahashi and Naruhisa Takato and Hiroshi Terada and Christian Thalmann and Daigo Tomono and Edwin L. Turner and Makoto Watanabe and John P. Wisniewski and Toru Yamada and Hideki Takami and Tomonori Usuda and Motohide Tamura},
journal= {arXiv preprint arXiv:1411.0671},
year = {2015}
}
Comments
Accepted by ApJ. 19 pages, 15 figures