• Login
    View Item 
    •   Home
    • UA Faculty Research
    • UA Faculty Publications
    • View Item
    •   Home
    • UA Faculty Research
    • UA Faculty Publications
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of UA Campus RepositoryCommunitiesTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournalThis CollectionTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournal

    My Account

    LoginRegister

    About

    AboutUA Faculty PublicationsUA DissertationsUA Master's ThesesUA Honors ThesesUA PressUA YearbooksUA Catalogs

    Statistics

    Display statistics

    Solar abundances of rock-forming elements, extreme oxygen and hydrogen in a young polluted white dwarf

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    stw2182.pdf
    Size:
    710.1Kb
    Format:
    PDF
    Description:
    Final Published Version
    Download
    Author
    Farihi, J. cc
    Koester, D.
    Zuckerman, B.
    Vican, L.
    Gänsicke, B. T.
    Smith, N.
    Walth, G.
    Breedt, E.
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2016-12-11
    Keywords
    stars: abundances
    circumstellar matter
    stars: individual: (WD 1536+520)
    planetary systems
    white dwarfs
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    Solar abundances of rock-forming elements, extreme oxygen and hydrogen in a young polluted white dwarf 2016, 463 (3):3186 Monthly Notices of the Royal Astronomical Society
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
    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
    The T-eff = 20 800 K white dwarf WD 1536+520 is shown to have broadly solar abundances of the major rock-forming elements O, Mg, Al, Si, Ca, and Fe, together with a strong relative depletion in the volatile elements C and S. In addition to the highest metal abundances observed to date, including log (O/He) = -3.4, the helium-dominated atmosphere has an exceptional hydrogen abundance at log (H/He) = -1.7. Within the uncertainties, the metal-to-metal ratios are consistent with the accretion of an H2O-rich and rocky parent body, an interpretation supported by the anomalously high trace hydrogen. The mixed atmosphere yields unusually short diffusion time-scales for a helium atmosphere white dwarf, of no more than a few hundred years, and equivalent to those in a much cooler, hydrogen-rich star. The overall heavy element abundances of the disrupted parent body deviate modestly from a bulk Earth pattern, and suggest the deposition of some core-like material. The total inferred accretion rate is 4.2 x 10(9) g s(-1), and at least four times higher than for any white dwarf with a comparable diffusion time-scale. Notably, when accretion is exhausted in this system, both metals and hydrogen will become undetectable within roughly 300 Myr, thus supporting a scenario where the trace hydrogen is related to the ongoing accretion of planetary debris.
    ISSN
    0035-8711
    1365-2966
    DOI
    10.1093/mnras/stw2182
    Version
    Final published version
    Sponsors
    MMT; WHT [SW2014a39]; STFC via an Ernest Rutherford Fellowship; NASA grant; NSF pre-doctoral fellowship; ERC under the European Union's 7th Framework Programme [320964]
    Additional Links
    https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw2182
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stw2182
    Scopus Count
    Collections
    UA Faculty Publications

    entitlement

     
    The University of Arizona Libraries | 1510 E. University Blvd. | Tucson, AZ 85721-0055
    Tel 520-621-6442 | repository@u.library.arizona.edu
    DSpace software copyright © 2002-2017  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.