2013ApJ...767...10F
Mapping H-band Scattered Light Emission in the Mysterious SR21 Transitional Disk
Follette, Katherine B. ( Steward Observatory, The University of Arizona, 933 N Cherry Ave, Tucson, AZ 85721, USA ); Tamura, Motohide ( National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ; Department of Astronomical Science, Graduate University for Advanced Studies (Sokendai), Tokyo 181-8588, Japan ); Hashimoto, Jun ( National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ); Whitney, Barbara ( Astronomy Department, University of Wisconsin-Madison, 475 N. Charter Street, Madison, WI 53706, USA ); Grady, Carol ( Eureka Scientific, 2452 Delmer, Suite 100, Oakland, CA 96002, USA ); Close, Laird ( Steward Observatory, The University of Arizona, 933 N Cherry Ave, Tucson, AZ 85721, USA ); Andrews, Sean M. ( Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA ); Kwon, Jungmi ( National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; Department of Astronomical Science, Graduate University for Advanced Studies (Sokendai), Tokyo 181-8588, Japan ); Wisniewski, John ( H.L. Dodge Department of Physics and Astronomy, University of Oklahoma, 440 W Brooks St Norman, OK 73019, USA ); Brandt, Timothy D. ( Department of Astrophysical Sciences, Princeton University, NJ 08544, USA ); Mayama, Satoshi ( The Center for the Promotion of Integrated Sciences, The Graduate University for Advanced Studies (Sokendai), Shonan International Village, Hayama-cho, Miura-gun, Kanagawa 240-0193, Japan ); Kandori, Ryo ( National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ); Dong, Ruobing ( Department of Astrophysical Sciences, Princeton University, NJ 08544, USA ); Abe, Lyu ( Laboratoire Lagrange, UMR7293, Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, F-06300 Nice, France ); Brandner, Wolfgang ( Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany ); Carson, Joseph ( Department of Physics and Astronomy, College of Charleston, 58 Coming St., Charleston, SC 29424, USA ); Currie, Thayne ( Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street M5S 3H4, Toronto Ontario, Canada ); Egner, Sebastian E. ( Subaru Telescope, 650 North Aohoku Place, Hilo, HI 96720, USA ); Feldt, Markus ( Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany ); Goto, Miwa ( Universitats-Sternwarte Munchen, Ludwig-Maximilians-Universitat, Scheinerstr. 1, D-81679 Munchen, Germany ); Guyon, Olivier ( Subaru Telescope, 650 North Aohoku Place, Hilo, HI 96720, USA ); Hayano, Yutaka ( Subaru Telescope, 650 North Aohoku Place, Hilo, HI 96720, USA ); Hayashi, Masahiko ( Department of Astronomy, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan ); Hayashi, Saeko ( Subaru Telescope, 650 North Aohoku Place, Hilo, HI 96720, USA ); Henning, Thomas ( Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany ); Hodapp, Klaus ( Institute for Astronomy, University of Hawaii, 640 North A'ohoku Place, Hilo, HI 96720, USA ); Ishii, Miki ( Subaru Telescope, 650 North Aohoku Place, Hilo, HI 96720, USA ); Iye, Masanori ( National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ); Janson, Markus ( Department of Astrophysical Sciences, Princeton University, NJ 08544, USA ); Knapp, Gillian R. ( Department of Astrophysical Sciences, Princeton University, NJ 08544, USA ); Kudo, Tomoyuki ( Subaru Telescope, 650 North Aohoku Place, Hilo, HI 96720, USA ); Kusakabe, Nobuhiko ( National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ); Kuzuhara, Masayuki ( National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ); McElwain, Michael W. ( ExoPlanets and Stellar Astrophysics Laboratory, Code 667, Goddard Space Flight Center, Greenbelt, MD 20771, USA ); Matsuo, Taro ( Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan ); Miyama, Shoken ( Office of the President, Hiroshima University, 1-3-2 Kagamiyama, Higashi-Hiroshima, 739-8511, Japan ); Morino, Jun-Ichi ( National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ); Moro-Martin, Amaya ( Departamento de Astrofísica, CAB (INTA-CSIC), Instituto Nacional de Técnica Aeroespacial, Torrejónde Ardoz, E-28850, Madrid, Spain ); Nishimura, Tetsuo ( Subaru Telescope, 650 North Aohoku Place, Hilo, HI 96720, USA ); Pyo, Tae-Soo ( Subaru Telescope, 650 North Aohoku Place, Hilo, HI 96720, USA ); Serabyn, Eugene ( Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA ); Suto, Hiroshi ( National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ); Suzuki, Ryuji ( TMT Observatory Corporation, 1111 South Arroyo Parkway, Pasadena, CA 91105, USA ); Takami, Michihiro ( Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 106, Taiwan ); Takato, Naruhisa ( Subaru Telescope, 650 North Aohoku Place, Hilo, HI 96720, USA ); Terada, Hiroshi ( Subaru Telescope, 650 North Aohoku Place, Hilo, HI 96720, USA ); Thalmann, Christian ( Astronomical Institute "Anton Pannekoek," University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands ); Tomono, Daigo ( Subaru Telescope, 650 North Aohoku Place, Hilo, HI 96720, USA ); Turner, Edwin L. ( Department of Astrophysical Sciences, Princeton University, NJ 08544, USA; Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo, Kashiwa 277-8568, Japan ); Watanabe, Makoto ( Department of Cosmosciences, Hokkaido University, Sapporo 060-0810, Japan ); Yamada, Toru ( Astronomical Institute, Tohoku University, Aoba, Sendai 980-8578, Japan ); Takami, Hideki ( Subaru Telescope, 650 North Aohoku Place, Hilo, HI 96720, USA ); Usuda, Tomonori ( Subaru Telescope, 650 North Aohoku Place, Hilo, HI 96720, USA ) and 43 coauthors show affiliations
The Astrophysical Journal, Volume 767, Issue 1, article id. 10, 26 pp. (2013).
Published in Apr 2013
We present the first near infrared (NIR) spatially resolved images of the circumstellar transitional disk around SR21. These images were obtained with the Subaru HiCIAO camera, adaptive optics, and the polarized differential imaging technique. We resolve the disk in scattered light at H-band for stellocentric 0.''1 <= r <= 0.''6 (12 <~ r <~ 75 AU). We compare our results with previously published spatially resolved 880 μm continuum Submillimeter Array images that show an inner r <~ 36 AU cavity in SR21. Radiative transfer models reveal that the large disk depletion factor invoked to explain SR21's sub-mm cavity cannot be "universal" for all grain sizes. Even significantly more moderate depletions (δ = 0.1, 0.01 relative to an undepleted disk) than those that reproduce the sub-mm cavity (δ ~ 10-6) are inconsistent with our H-band images when they are assumed to carry over to small grains, suggesting that surface grains scattering in the NIR either survive or are generated by whatever mechanism is clearing the disk midplane. In fact, the radial polarized intensity profile of our H-band observations is smooth and steeply inwardly-increasing (r -3), with no evidence of a break at the 36 AU sub-mm cavity wall. We hypothesize that this profile is dominated by an optically thin disk envelope or atmosphere component. We also discuss the compatibility of our data with the previously postulated existence of a sub-stellar companion to SR21 at r ~ 10-20 AU, and find that we can neither exclude nor verify this scenario. This study demonstrates the power of multiwavelength imaging of transitional disks to inform modeling efforts, including the debate over precisely what physical mechanism is responsible for clearing these disks of their large midplane grains.Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
Keywords:
Free Keywords: Astrophysics - Solar and Stellar Astrophysics; planetary systems; protoplanetary disks; stars: individual: SR21; stars: pre-main sequence; techniques: polarimetric
Astronomy: planetary systems; protoplanetary disks; stars: individual: SR21; stars: pre-main sequence; techniques: polarimetric
arXiv: Astrophysics - Solar and Stellar Astrophysics
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