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    An Exo–Kuiper Belt with an Extended Halo around HD 191089 in Scattered Light

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    Ren_2019_ApJ_882_64.pdf
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    Final Published Version
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    Author
    Schneider, Glenn cc
    Barman, Travis
    Affiliation
    Univ Arizona, Steward Observ
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2019-09-04
    Keywords
    protoplanetary disks
    radiative transfer
    stars: imaging
    stars: individual (HD 191089)
    techniques: image processing
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Bin Ren et al 2019 ApJ 882 64
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    Copyright © 2019. 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 have obtained Hubble Space Telescope STIS and NICMOS and Gemini/GPI scattered-light images of the HD 191089 debris disk. We identify two spatial components: a ring resembling the Kuiper Belt in radial extent (FWHM similar to 25 au, centered at similar to 46 au) and a halo extending to similar to 640 au. We find that the halo is significantly bluer than the ring, consistent with the scenario that the ring serves as the "birth ring" for the smaller dust in the halo. We measure the scattering phase functions in the 30 degrees -150 degrees scattering-angle range and find that the halo dust is more forward- and backward-scattering than the ring dust. We measure a surface density power-law index of -0.68 +/- 0.04 for the halo, which indicates the slowdown of the radial outward motion of the dust. Using radiative transfer modeling, we attempt to simultaneously reproduce the (visible) total and (near-infrared) polarized intensity images of the birth ring. Our modeling leads to mutually inconsistent results, indicating that more complex models, such as the inclusion of more realistic aggregate particles, are needed.
    ISSN
    0004-637X
    DOI
    10.3847/1538-4357/ab3403
    Version
    Final published version
    Sponsors
    NASA through Hubble Fellowship - STScI [HST-HF2-51355, NAS5-26555]; Australian Research CouncilAustralian Research Council [FT170100040, DP180104235]; NSFNational Science Foundation (NSF) [NNX15AD95G/NEXSS, AST-1413718, AST-1616479]; NASANational Aeronautics & Space Administration (NASA) [NAS5-26555, HST-AR-12652, NNX15AD95G/NEXSS, HST-GO-11136, HST-GO-13855, HST-GO-13331, NNX15AC89G, NSF AST-1518332]; STScI Director's Discretionary Research funds; Legacy Archive project, "A Legacy Archive PSF Library And Circumstellar Environments (LAPLACE) Investigation" [HST-AR-11279]
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/ab3403
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