X-Ray and Optical Studies of the Redback System PSR J2129-0429

Hind Al Noori, Mallory Roberts, Rodrigo A. Torres, Maura A. McLaughlin, Peter A. Gentile, Jason W.T. Hessels, Paul S. Ray, Matthew Kerr, Rene P. Breton

    Research output: Contribution to journalArticle

    Abstract

    PSR J2129-0429 is a 7.62 ms eclipsing millisecond pulsar (MSP) with a non-degenerate binary companion star that is likely in an early stage of the recycling process. It has one of the largest companion masses of a so-called "redback" (0.4 M o) and has an unusually high surface magnetic field (1.6 × 109 G) for an MSP. We present here an X-ray and optical study of PSR J2129-0429 using new NuSTAR and LCOGT data of the system in addition to archival Swift and XMM-Newton data. Its X-ray light curve shows strong orbital variation from the intra-binary shock, about five times greater than is typical for other systems, and is clearly and persistently double-peaked. Its X-ray spectrum has a very hard power-law component (Γ = 1.1-1.2) which extends to ∼40 keV and exhibits an efficiency of up to a few percent in the X-ray band. The X-ray spectrum at the second peak of the light curve exhibits strong variability, while the spectrum of the first peak remains constant across observations. The hardness of the spectrum is suggestive of driven magnetic reconnection occurring at the shock. In addition, we observe the companion to be currently optically brightening after a multi-year period where it was dimming. The changes in color suggest that it has been continually cooling, implying that the companion is currently expanding.

    Original languageEnglish (US)
    Article number89
    JournalAstrophysical Journal
    Volume861
    Issue number2
    DOIs
    StatePublished - Jul 10 2018

    Fingerprint

    x rays
    pulsars
    light curve
    shock
    dimming
    companion stars
    binary stars
    XMM-Newton telescope
    recycling
    newton
    hardness
    power law
    magnetic field
    cooling
    color
    orbitals
    magnetic fields

    Keywords

    • binaries: eclipsing
    • magnetic reconnection
    • pulsars: individual (J2129-0429)
    • X-rays: binaries

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Al Noori, H., Roberts, M., Torres, R. A., McLaughlin, M. A., Gentile, P. A., Hessels, J. W. T., ... Breton, R. P. (2018). X-Ray and Optical Studies of the Redback System PSR J2129-0429. Astrophysical Journal, 861(2), [89]. https://doi.org/10.3847/1538-4357/aac828

    X-Ray and Optical Studies of the Redback System PSR J2129-0429. / Al Noori, Hind; Roberts, Mallory; Torres, Rodrigo A.; McLaughlin, Maura A.; Gentile, Peter A.; Hessels, Jason W.T.; Ray, Paul S.; Kerr, Matthew; Breton, Rene P.

    In: Astrophysical Journal, Vol. 861, No. 2, 89, 10.07.2018.

    Research output: Contribution to journalArticle

    Al Noori, H, Roberts, M, Torres, RA, McLaughlin, MA, Gentile, PA, Hessels, JWT, Ray, PS, Kerr, M & Breton, RP 2018, 'X-Ray and Optical Studies of the Redback System PSR J2129-0429', Astrophysical Journal, vol. 861, no. 2, 89. https://doi.org/10.3847/1538-4357/aac828
    Al Noori H, Roberts M, Torres RA, McLaughlin MA, Gentile PA, Hessels JWT et al. X-Ray and Optical Studies of the Redback System PSR J2129-0429. Astrophysical Journal. 2018 Jul 10;861(2). 89. https://doi.org/10.3847/1538-4357/aac828
    Al Noori, Hind ; Roberts, Mallory ; Torres, Rodrigo A. ; McLaughlin, Maura A. ; Gentile, Peter A. ; Hessels, Jason W.T. ; Ray, Paul S. ; Kerr, Matthew ; Breton, Rene P. / X-Ray and Optical Studies of the Redback System PSR J2129-0429. In: Astrophysical Journal. 2018 ; Vol. 861, No. 2.
    @article{7a61b62862a24cfa8a0ab8323b91f21c,
    title = "X-Ray and Optical Studies of the Redback System PSR J2129-0429",
    abstract = "PSR J2129-0429 is a 7.62 ms eclipsing millisecond pulsar (MSP) with a non-degenerate binary companion star that is likely in an early stage of the recycling process. It has one of the largest companion masses of a so-called {"}redback{"} (0.4 M o) and has an unusually high surface magnetic field (1.6 × 109 G) for an MSP. We present here an X-ray and optical study of PSR J2129-0429 using new NuSTAR and LCOGT data of the system in addition to archival Swift and XMM-Newton data. Its X-ray light curve shows strong orbital variation from the intra-binary shock, about five times greater than is typical for other systems, and is clearly and persistently double-peaked. Its X-ray spectrum has a very hard power-law component (Γ = 1.1-1.2) which extends to ∼40 keV and exhibits an efficiency of up to a few percent in the X-ray band. The X-ray spectrum at the second peak of the light curve exhibits strong variability, while the spectrum of the first peak remains constant across observations. The hardness of the spectrum is suggestive of driven magnetic reconnection occurring at the shock. In addition, we observe the companion to be currently optically brightening after a multi-year period where it was dimming. The changes in color suggest that it has been continually cooling, implying that the companion is currently expanding.",
    keywords = "binaries: eclipsing, magnetic reconnection, pulsars: individual (J2129-0429), X-rays: binaries",
    author = "{Al Noori}, Hind and Mallory Roberts and Torres, {Rodrigo A.} and McLaughlin, {Maura A.} and Gentile, {Peter A.} and Hessels, {Jason W.T.} and Ray, {Paul S.} and Matthew Kerr and Breton, {Rene P.}",
    year = "2018",
    month = "7",
    day = "10",
    doi = "10.3847/1538-4357/aac828",
    language = "English (US)",
    volume = "861",
    journal = "Astrophysical Journal",
    issn = "0004-637X",
    publisher = "IOP Publishing Ltd.",
    number = "2",

    }

    TY - JOUR

    T1 - X-Ray and Optical Studies of the Redback System PSR J2129-0429

    AU - Al Noori, Hind

    AU - Roberts, Mallory

    AU - Torres, Rodrigo A.

    AU - McLaughlin, Maura A.

    AU - Gentile, Peter A.

    AU - Hessels, Jason W.T.

    AU - Ray, Paul S.

    AU - Kerr, Matthew

    AU - Breton, Rene P.

    PY - 2018/7/10

    Y1 - 2018/7/10

    N2 - PSR J2129-0429 is a 7.62 ms eclipsing millisecond pulsar (MSP) with a non-degenerate binary companion star that is likely in an early stage of the recycling process. It has one of the largest companion masses of a so-called "redback" (0.4 M o) and has an unusually high surface magnetic field (1.6 × 109 G) for an MSP. We present here an X-ray and optical study of PSR J2129-0429 using new NuSTAR and LCOGT data of the system in addition to archival Swift and XMM-Newton data. Its X-ray light curve shows strong orbital variation from the intra-binary shock, about five times greater than is typical for other systems, and is clearly and persistently double-peaked. Its X-ray spectrum has a very hard power-law component (Γ = 1.1-1.2) which extends to ∼40 keV and exhibits an efficiency of up to a few percent in the X-ray band. The X-ray spectrum at the second peak of the light curve exhibits strong variability, while the spectrum of the first peak remains constant across observations. The hardness of the spectrum is suggestive of driven magnetic reconnection occurring at the shock. In addition, we observe the companion to be currently optically brightening after a multi-year period where it was dimming. The changes in color suggest that it has been continually cooling, implying that the companion is currently expanding.

    AB - PSR J2129-0429 is a 7.62 ms eclipsing millisecond pulsar (MSP) with a non-degenerate binary companion star that is likely in an early stage of the recycling process. It has one of the largest companion masses of a so-called "redback" (0.4 M o) and has an unusually high surface magnetic field (1.6 × 109 G) for an MSP. We present here an X-ray and optical study of PSR J2129-0429 using new NuSTAR and LCOGT data of the system in addition to archival Swift and XMM-Newton data. Its X-ray light curve shows strong orbital variation from the intra-binary shock, about five times greater than is typical for other systems, and is clearly and persistently double-peaked. Its X-ray spectrum has a very hard power-law component (Γ = 1.1-1.2) which extends to ∼40 keV and exhibits an efficiency of up to a few percent in the X-ray band. The X-ray spectrum at the second peak of the light curve exhibits strong variability, while the spectrum of the first peak remains constant across observations. The hardness of the spectrum is suggestive of driven magnetic reconnection occurring at the shock. In addition, we observe the companion to be currently optically brightening after a multi-year period where it was dimming. The changes in color suggest that it has been continually cooling, implying that the companion is currently expanding.

    KW - binaries: eclipsing

    KW - magnetic reconnection

    KW - pulsars: individual (J2129-0429)

    KW - X-rays: binaries

    UR - http://www.scopus.com/inward/record.url?scp=85050658136&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85050658136&partnerID=8YFLogxK

    U2 - 10.3847/1538-4357/aac828

    DO - 10.3847/1538-4357/aac828

    M3 - Article

    VL - 861

    JO - Astrophysical Journal

    JF - Astrophysical Journal

    SN - 0004-637X

    IS - 2

    M1 - 89

    ER -