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    PSR J2322-2650 - a low-luminosity millisecond pulsar with a planetary-mass companion

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    Access Status
    Open access
    Authors
    Spiewak, R.
    Bailes, M.
    Barr, E.
    Bhat, Ramesh
    Burgay, M.
    Cameron, A.
    Champion, D.
    Flynn, C.
    Jameson, A.
    Johnston, S.
    Keith, M.
    Kramer, M.
    Kulkarni, S.
    Levin, L.
    Lyne, G.
    Morello, V.
    Ng, C.
    Possenti, A.
    Ravi, V.
    Stappers, B.
    van Straten, W.
    Tiburzi, C.
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Spiewak, R. and Bailes, M. and Barr, E. and Bhat, R. and Burgay, M. and Cameron, A. and Champion, D. et al. 2018. PSR J2322-2650 - a low-luminosity millisecond pulsar with a planetary-mass companion. Monthly Notices of the Royal Astronomical Society. 475 (1): pp. 469-477.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stx3157
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/67457
    Collection
    • Curtin Research Publications
    Abstract

    We present the discovery of a binary millisecond pulsar (MSP), PSR J2322-2650, found in the southern section of the High Time Resolution Universe survey. This system contains a 3.5-ms pulsar with a ~10 -3 M⊙ companion in a 7.75-h circular orbit. Follow-up observations at the Parkes and Lovell telescopes have led to precise measurements of the astrometric and spin parameters, including the period derivative, timing parallax, and proper motion. PSR J2322-2650 has a parallax of 4.4 ± 1.2 mas, and is thus at an inferred distance of 230 +90 -50 pc, making this system a candidate for optical studies. We have detected a source of R ~ 26.4 mag at the radio position in a single R-band observation with the Keck telescope, and this is consistent with the blackbody temperaturewewould expect from the companion if it fills its Roche lobe. The intrinsic period derivative of PSR J2322-2650 is among the lowest known, 4.4(4) × 10 -22 s s -1 , implying a low surface magnetic field strength, 4.0(4) × 10 7 G. Its mean radio flux density of 160 μJy combined with the distance implies that its radio luminosity is the lowest ever measured, 0.008(5) mJy kpc 2 . The inferred population of these systems in the Galaxy may be very significant, suggesting that this is a common MSP evolutionary path.

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