SEEDS ADAPTIVE OPTICS IMAGING OF THE ASYMMETRIC TRANSITION DISK OPH IRS 48 IN SCATTERED LIGHT

Journal Article · Sat Jan 10 00:00:00 EST 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/798/2/132· OSTI ID:22364614

Follette, Katherine B.; Close, Laird M. ^[1]; Grady, Carol A. ^[2]; Swearingen, Jeremy R.; Sitko, Michael L.; Champney, Elizabeth H. ^[3]; Van der Marel, Nienke; Maaskant, Koen; Min, Michiel ^[4]; Takami, Michihiro ^[5]; Kuchner, Marc J; McElwain, Michael W. ^[6]; Muto, Takayuki ^[7]; Mayama, Satoshi ^[8]; Fukagawa, Misato ^[9]; Russell, Ray W. ^[10]; Kudo, Tomoyuki ^[11]; Kusakabe, Nobuhiko ^[12]; Hashimoto, Jun ^[13]; Abe, Lyu ^[14] ; others, and

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1. Steward Observatory, The University of Arizona, 933 N. Cherry Ave., Tucson, AZ 85721 (United States)
2. Eureka Scientific, 2452 Delmer, Suite 100, Oakland, CA 96002 (United States)
3. Department of Physics, University of Cincinnati, Cincinnati, OH 45221 (United States)
4. Leiden Observatory, Leiden University, P.O. Box 9513, 2300-RA Leiden (Netherlands)
5. Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 106, Taiwan (China)
6. NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics Laboratory, Code 667, Greenbelt, MD 20771 (United States)
7. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551 (Japan)
8. The Graduate University for Advanced Studies (SOKENDAI), Shonan International Village, Hayama-cho, Miura-gun, Kanagawa 240-0193 (Japan)
9. Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043 (Japan)
10. The Aerospace Corporation, Los Angeles, CA 90009 (United States)
11. Subaru Telescope, 650 North A'ohoku Place, Hilo, HI 96720 (United States)
12. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)
13. H. L. Dodge Department of Physics and Astronomy, University of Oklahoma, 440 West Brooks St., Norman, OK 73019 (United States)
14. Laboratoire Lagrange, UMR7293, Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, 28 avenue Valrose, F-06108 Nice Cedex 2 (France)

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 submillimeter flux distribution. H-band polarized intensity images show a ∼60 AU 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 μm IRTF SpeX spectra of this object, which allow us to constrain the spectral class to A0 ± 1 and measure a low mass accretion rate of 10{sup –8.5} M {sub ☉} yr{sup –1}, both consistent with previous estimates. We investigate a variety of reddening laws in order to fit the multiwavelength spectral energy distribution of Oph IRS 48 and find a best fit consistent with a younger, higher luminosity star than previous estimates.

• OSTI ID: 22364614
• Journal Information: Astrophysical Journal, Vol. 798, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASYMMETRY
BRIGHTNESS
ENERGY SPECTRA
IMAGES
LUMINOSITY
MASS
MORPHOLOGY
NEAR INFRARED RADIATION
OPTICS
PLANETS
POLARIMETRY
PROTOPLANETS
SATELLITES
STARS
VISIBLE RADIATION