• 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 CatalogsUA Libraries

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Infrared Variability of Two Dusty White Dwarfs

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Xu_2018_ApJ_866_108.pdf
    Size:
    3.049Mb
    Format:
    PDF
    Description:
    Final Published version
    Download
    Author
    Xu, Siyi
    Su, Kate Y. L. cc
    Rogers, L. K.
    Bonsor, Amy
    Olofsson, Johan
    Veras, Dimitri
    van Lieshout, Rik
    Dufour, Patrick
    Green, Elizabeth M.
    Schlawin, Everett
    Farihi, Jay
    Wilson, Thomas G.
    Wilson, David J.
    Gänsicke, Boris T.
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2018-10-20
    Keywords
    circumstellar matter
    minor planets, asteroids: general
    stars: individual (G29-38, SDSS J122859.93+104032.9)
    white dwarfs
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Siyi Xu et al 2018 ApJ 866 108
    Journal
    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
    The most heavily polluted white dwarfs often show excess infrared radiation from circumstellar dust disks, which are modeled as a result of tidal disruption of extrasolar minor planets. Interaction of dust, gas, and disintegrating objects can all contribute to the dynamical evolution of these dust disks. Here, we report two infrared variable dusty white dwarfs, SDSS. J1228+1040 and G29-38. For SDSS. J1228+1040, compared to the first measurements in 2007, the IRAC [3.6] and [4.5] fluxes decreased by 20% before 2014 to a level also seen in the recent 2018 observations. For G29-38, the infrared flux of the 10 mu m silicate emission feature became 10% stronger between 2004 and 2007, We explore several scenarios that could account for these changes, including tidal disruption events, perturbation from a companion, and runaway accretion. No satisfactory causes are found for the flux drop in SDSS. J1228+1040 due to the limited time coverage. Continuous tidal disruption of small planetesimals could increase the mass of small grains and concurrently change the strength of the 10 mu m feature of G29-38. Dust disks around white dwarfs are actively evolving and we speculate that there could be different mechanisms responsible for the temporal changes of these disks.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aadcfe
    Version
    Final published version
    Sponsors
    Royal Society Dorothy Hodgkin Fellowship; ICM (Iniciativa Cientifica Milenio) via the Nucleo Milenio de Formacion Planetaria grant; Fondecyt [1180395]; Science and Technology Facilities Council via an Ernest Rutherford Fellowship [ST/P003850/1]; STFC studentship; European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC [320964]; National Aeronautics and Space Administration; Universidad de Valparaiso
    Additional Links
    http://stacks.iop.org/0004-637X/866/i=2/a=108?key=crossref.e3222fb35dca8e6f80eb1e5bcb9e446a
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aadcfe
    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.