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    An asteroid belt interpretation for the timing variations of the millisecond pulsar b1937+21

    Access Status
    Fulltext not available
    Authors
    Shannon, Ryan
    Cordes, J.
    Metcalfe, T.
    Lazio, T.
    Cognard, I.
    Desvignes, G.
    Janssen, G.
    Jessner, A.
    Kramer, M.
    Lazaridis, K.
    Purver, M.
    Stappers, B.
    Theureau, G.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Shannon, R. and Cordes, J. and Metcalfe, T. and Lazio, T. and Cognard, I. and Desvignes, G. and Janssen, G. et al. 2013. An asteroid belt interpretation for the timing variations of the millisecond pulsar b1937+21. Astrophysical Journal. 766 (1): Article ID 5.
    Source Title
    Astrophysical Journal
    DOI
    10.1088/0004-637X/766/1/5
    ISSN
    0004-637X
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/14746
    Collection
    • Curtin Research Publications
    Abstract

    Pulsar timing observations have revealed companions to neutron stars that include other neutron stars, white dwarfs, main-sequence stars, and planets. We demonstrate that the correlated and apparently stochastic residual times of arrival from the millisecond pulsar B1937+21 are consistent with the signature of an asteroid belt having a total mass 0.05 M ⊕. Unlike the solar system’s asteroid belt, the best fit pulsar asteroid belt extends over a wide range of radii, consistent with the absence of any shepherding companions. We suggest that any pulsar that has undergone accretion-driven spin-up and subsequently evaporated its companion may harbor orbiting asteroid mass objects. The resulting timing variations may fundamentally limit the timing precision of some of the other millisecond pulsars. Observational tests of the asteroid belt model include identifying periodicities from individual asteroids, which are difficult; testing for statistical stationarity, which becomes possible when observations are conducted over a longer observing span; and searching for reflected radio emission.

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