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    Periodic modulation in pulse arrival times from young pulsars: a renewed case for neutron star precession

    Access Status
    Fulltext not available
    Authors
    Kerr, M.
    Hobbs, G.
    Johnston, S.
    Shannon, Ryan
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Kerr, M. and Hobbs, G. and Johnston, S. and Shannon, R. 2016. Periodic modulation in pulse arrival times from young pulsars: a renewed case for neutron star precession. Monthly Notices of the Royal Astronomical Society. 455 (2): pp. 1845-1854.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stv2457
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/12400
    Collection
    • Curtin Research Publications
    Abstract

    In a search for periodic variation in the arrival times of pulses from 151 young, energetic pulsars, we have identified seven cases of modulation consistent with one or two harmonics of a single fundamental with time-scale 0.5–1.5 yr. We use simulations to show that these modulations are statistically significant and of high quality (sinusoidal) even when contaminated by the strong stochastic timing noise common to young pulsars. Although planetary companions could induce such modulation, the large implied masses and 2:1 mean motion resonances challenge such an explanation. Instead, the modulation is likely to be intrinsic to the pulsar, arising from quasi-periodic switching between stable magnetospheric states, and we propose that precession of the neutron star may regulate this switching.

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