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    HD 104860 and HD 192758: Two Debris Disks Newly Imaged in Scattered Light with the Hubble Space Telescope

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    Choquet_2018_ApJ_854_53.pdf
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    Author
    Choquet, É. cc
    Bryden, G.
    Perrin, Marshall cc
    Soummer, Remi cc
    Augereau, J.-C.
    Chen, Christine H. cc
    Debes, John H. cc
    Gofas-Salas, E.
    Hagan, J. B.
    Hines, Dean C. cc
    Mawet, Dimitri cc
    Morales, F. cc
    Pueyo, L.
    Rajan, A.
    Ren, B. cc
    Schneider, Glenn cc
    Stark, C. C.
    Wolff, S.
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2018-02-12
    Keywords
    circumstellar matter
    stars: individual (HD 104860, HD 192758)
    techniques: image processing
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    HD 104860 and HD 192758: Two Debris Disks Newly Imaged in Scattered Light with the Hubble Space Telescope 2018, 854 (1):53 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2018. 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 present the first scattered-light images of two debris disks around the F8 star HD. 104860 and the F0V star HD. 192758, respectively similar to 45 and similar to 67. pc away. We detected these systems in the F110W and F160W filters through our reanalysis of archival Hubble Space Telescope (HST) NICMOS data with modern starlight-subtraction techniques. Our image of HD. 104860 confirms the morphology previously observed by Herschel in thermal emission with a well-defined ring at a radius of similar to 114. au inclined by similar to 58 degrees. Although the outer edge profile is consistent with dynamical evolution models, the sharp inner edge suggests sculpting by unseen perturbers. Our images of HD. 192758 reveal a disk at radius similar to 95. au inclined by similar to 59 degrees, never resolved so far. These disks have low scattering albedos of 10% and 13%, respectively, inconsistent with water ice grain compositions. They are reminiscent of several other disks with similar inclination and scattering albedos: Fomalhaut, HD. 92945, HD. 202628, and HD. 207129. They are also very distinct from brighter disks in the same inclination bin, which point to different compositions between these two populations. Varying scattering albedo values can be explained by different grain porosities, chemical compositions, or grain size distributions, which may indicate distinct formation mechanisms or dynamical processes at work in these systems. Finally, these faint disks with large infrared excesses may be representative of an underlying population of systems with low albedo values. Searches with more sensitive instruments on HST or on the James Webb Space Telescope and using state-of-the art starlight-subtraction methods may help discover more of such faint systems.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aaa892
    Version
    Final published version
    Sponsors
    NASA through Hubble Fellowship - STScI [HF2-51355]; NASA [NAS5-26555, HST-AR-12652, HST-GO-11136, HST-GO-13855, HST-GO-13331, HST-AR-11279]; "Programme National de Planetologie" (PNP) of CNRS/INSU - CNES; STScI Director's Discretionary Research funds; HST programs [HST-GO-10527, HST-GO-11157]
    Additional Links
    http://stacks.iop.org/0004-637X/854/i=1/a=53?key=crossref.30694184d5dd7470bf00439afa7458a6
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aaa892
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