Boston University Libraries OpenBU
    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    •   OpenBU
    • BU Open Access Articles
    • BU Open Access Articles
    • View Item
    •   OpenBU
    • BU Open Access Articles
    • BU Open Access Articles
    • View Item

    Shallow Ultraviolet Transits of WD 1145+017

    Thumbnail
    Date Issued
    2019-06-05
    Publisher Version
    10.3847/1538-3881/ab1b36
    Author(s)
    Xu, Siyi
    Hallakoun, Na’ama
    Gary, Bruce
    Dalba, Paul A.
    Debes, John
    Dufour, Patrick
    Fortin-Archambault, Maude
    Fukui, Akihiko
    Jura, Michael A.
    Klein, Beth
    Kusakabe, Nobuhiko
    Muirhead, Philip S.
    Narita, Norio
    Steele, Amy
    Su, Kate Y.L.
    Vanderburg, Andrew
    Watanabe, Noriharu
    Zhan, Zhuchang
    Zuckerman, Ben
    Share to FacebookShare to TwitterShare by Email
    Export Citation
    Download to BibTex
    Download to EndNote/RefMan (RIS)
    Metadata
    Show full item record
    Permanent Link
    https://hdl.handle.net/2144/39806
    Version
    Published version
    Citation (published version)
    Siyi Xu, Na’ama Hallakoun, Bruce Gary, Paul A. Dalba, John Debes, Patrick Dufour, Maude Fortin-Archambault, Akihiko Fukui, Michael A. Jura, Beth Klein, Nobuhiko Kusakabe, Philip S. Muirhead, Norio Narita, Amy Steele, Kate Y.L. Su, Andrew Vanderburg, Noriharu Watanabe, Zhuchang Zhan, Ben Zuckerman. 2019. "Shallow Ultraviolet Transits of WD 1145+017." The Astronomical Journal, Volume 157, Issue 6, pp. 255 - 255. https://doi.org/10.3847/1538-3881/ab1b36
    Abstract
    WD 1145+017 is a unique white dwarf system that has a heavily polluted atmosphere, an infrared excess from a dust disk, numerous broad absorption lines from circumstellar gas, and changing transit features, likely from fragments of an actively disintegrating asteroid. Here, we present results from a large photometric and spectroscopic campaign with Hubble Space Telescope, Keck, Very Large Telescope (VLT), Spitzer, and many other smaller telescopes from 2015 to 2018. Somewhat surprisingly the ultraviolet (UV) transit depths are always shallower than those in the optical. We develop a model that can quantitatively explain the observed "bluing" and confirm the previous finding that: (1) the transiting objects, circumstellar gas, and white dwarf are all aligned along our line of sight; (2) the transiting object is blocking a larger fraction of the circumstellar gas than of the white dwarf itself. Because most circumstellar lines are concentrated in the UV, the UV flux appears to be less blocked compared to the optical during a transit, leading to a shallower UV transit. This scenario is further supported by the strong anticorrelation between optical transit depth and circumstellar line strength. We have yet to detect any wavelength-dependent transits caused by the transiting material around WD 1145+017.
    Rights
    © 2019 The American Astronomical Society.
    Collections
    • CAS: Astronomy: Scholarly Papers [172]
    • BU Open Access Articles [3664]


    Boston University
    Contact Us | Send Feedback | Help
     

     

    Browse

    All of OpenBUCommunities & CollectionsIssue DateAuthorsTitlesSubjectsThis CollectionIssue DateAuthorsTitlesSubjects

    Deposit Materials

    LoginNon-BU Registration

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Boston University
    Contact Us | Send Feedback | Help