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    The Sizes and Depletions of the Dust and Gas Cavities in the Transitional Disk J160421.7-213028

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    Dong_2017_ApJ_836_201.pdf
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    Author
    Dong, Ruobing
    Marel, Nienke van der
    Hashimoto, Jun
    Chiang, Eugene cc
    Akiyama, E. cc
    Liu, Hauyu Baobab cc
    Muto, Takayuki
    Knapp, Gillian R.
    Tsukagoshi, Takashi cc
    Brown, Joanna
    Bruderer, Simon
    Koyamatsu, Shin
    Kudo, Tomoyuki cc
    Ohashi, Nagayoshi cc
    Rich, Evan cc
    Satoshi, Mayama
    Takami, M. cc
    Wisniewski, J. cc
    Yang, Yi cc
    Zhu, Zhaohuan cc
    Tamura, Motohide cc
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    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-02-21
    Keywords
    circumstellar matter
    planets and satellites: formation
    protoplanetary disks
    stars: individual ([PZ99] J160421.7-213028)
    stars: pre-main sequence
    stars: variables: T Tauri, Herbig Ae/Be
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    The Sizes and Depletions of the Dust and Gas Cavities in the Transitional Disk J160421.7-213028 2017, 836 (2):201 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2017. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We report ALMA Cycle 2 observations of 230 GHz (1.3 mm) dust continuum emission, and (CO)-C-12, (CO)-C-13, and (CO)-O-18 J = 2-1 line emission, from the Upper Scorpius transitional disk [PZ99] J160421.7-213028, with an angular resolution of similar to 0''.25 (35 au). Armed with these data and existing H-band scattered light observations, we measure the size and depth of the disk's central cavity, and the sharpness of its outer edge, in three components: sub-mu m-sized "small" dust traced by scattered light, millimeter-sized "big" dust traced by the millimeter continuum, and gas traced by line emission. Both dust populations feature a cavity of radius similar to 70 au that is depleted by factors of at least 1000 relative to the dust density just outside. The millimeter continuum data are well explained by a cavity with a sharp edge. Scattered light observations can be fitted with a cavity in small dust that has either a sharp edge at 60 au, or an edge that transitions smoothly over an annular width of 10 au near 60 au. In gas, the data are consistent with a cavity that is smaller, about 15 au in radius, and whose surface density at 15 au is 10(3 +/- 1) times smaller than the surface density at 70 au; the gas density grades smoothly between these two radii. The CO isotopologue observations rule out a sharp drop in gas surface density at 30 au or a double-drop model, as found by previous modeling. Future observations are needed to assess the nature of these gas and dust cavities (e.g., whether they are opened by multiple as-yet-unseen planets or photoevaporation).
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aa5abf
    Version
    Final published version
    Sponsors
    NASA through Hubble Fellowship - Space Telescope Science Institute [HST-HF-51320.01-A]; NASA [NAS 5-26555]; UC Berkeley Vice Chancellor for Research; Berkeley Center for Integrative Planetary Science
    Additional Links
    http://stacks.iop.org/0004-637X/836/i=2/a=201?key=crossref.be072c3fc1596b8074fd98a03c1196c1
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aa5abf
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