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    Evidence of an asteroid encountering a pulsar

    Access Status
    Open access via publisher
    Authors
    Brook, P.
    Karastergiou, A.
    Buchner, S.
    Roberts, S.
    Keith, M.
    Johnston, S.
    Shannon, Ryan
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Brook, P. and Karastergiou, A. and Buchner, S. and Roberts, S. and Keith, M. and Johnston, S. and Shannon, R. 2014. Evidence of an asteroid encountering a pulsar. Astrophysical Journal Letters. 780 (2).
    Source Title
    Astrophysical Journal Letters
    DOI
    10.1088/2041-8205/780/2/L31
    ISSN
    2041-8205
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/43601
    Collection
    • Curtin Research Publications
    Abstract

    Debris disks and asteroid belts are expected to form around young pulsars due to fallback material from their original supernova explosions. Disk material may migrate inward and interact with a pulsar's magnetosphere, causing changes in torque and emission. Long-term monitoring of PSR J0738-4042 reveals both effects. The pulse shape changes multiple times between 1988 and 2012. The torque, inferred via the derivative of the rotational period, changes abruptly from 2005 September. This change is accompanied by an emergent radio component that drifts with respect to the rest of the pulse. No known intrinsic pulsar processes can explain these timing and radio emission signatures. The data lead us to postulate that we are witnessing an encounter with an asteroid or in-falling debris from a disk.

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