Magnetic energy production by turbulence in binary neutron star mergers

Jonathan Zrake, Andrew I. MacFadyen

    Research output: Contribution to journalArticle

    Abstract

    The simultaneous detection of electromagnetic and gravitational wave emission from merging neutron star binaries would greatly aid in their discovery and interpretation. By studying turbulent amplification of magnetic fields in local high-resolution simulations of neutron star merger conditions, we demonstrate that magnetar-level (≳ 1016 G) fields are present throughout the merger duration. We find that the small-scale turbulent dynamo converts 60% of the randomized kinetic energy into magnetic fields on a merger timescale. Since turbulent magnetic energy dissipates through reconnection events that accelerate relativistic electrons, turbulence may facilitate the conversion of orbital kinetic energy into radiation. If 10-4 of the ∼1053 erg of orbital kinetic available gets processed through reconnection and creates radiation in the 15-150 keV band, then the fluence at 200 Mpc would be 10-7 erg cm-2, potentially rendering most merging neutron stars in the advanced LIGO and Virgo detection volumes detectable by Swift BAT.

    Original languageEnglish (US)
    Article numberL29
    JournalAstrophysical Journal Letters
    Volume769
    Issue number2
    DOIs
    StatePublished - Jun 1 2013

    Fingerprint

    binary stars
    merger
    neutron stars
    turbulence
    erg
    kinetic energy
    magnetic field
    orbitals
    magnetars
    LIGO (observatory)
    radiation
    magnetic fields
    gravitational waves
    energy
    amplification
    electromagnetic radiation
    fluence
    timescale
    electron
    kinetics

    Keywords

    • gamma-ray burst: general
    • gravitational waves
    • magnetohydrodynamics (MHD)
    • stars: neutron
    • Turbulence
    • X-rays: general

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Magnetic energy production by turbulence in binary neutron star mergers. / Zrake, Jonathan; MacFadyen, Andrew I.

    In: Astrophysical Journal Letters, Vol. 769, No. 2, L29, 01.06.2013.

    Research output: Contribution to journalArticle

    Zrake, Jonathan ; MacFadyen, Andrew I. / Magnetic energy production by turbulence in binary neutron star mergers. In: Astrophysical Journal Letters. 2013 ; Vol. 769, No. 2.
    @article{469e44e15c0141d59f01bfc80fdefc54,
    title = "Magnetic energy production by turbulence in binary neutron star mergers",
    abstract = "The simultaneous detection of electromagnetic and gravitational wave emission from merging neutron star binaries would greatly aid in their discovery and interpretation. By studying turbulent amplification of magnetic fields in local high-resolution simulations of neutron star merger conditions, we demonstrate that magnetar-level (≳ 1016 G) fields are present throughout the merger duration. We find that the small-scale turbulent dynamo converts 60{\%} of the randomized kinetic energy into magnetic fields on a merger timescale. Since turbulent magnetic energy dissipates through reconnection events that accelerate relativistic electrons, turbulence may facilitate the conversion of orbital kinetic energy into radiation. If 10-4 of the ∼1053 erg of orbital kinetic available gets processed through reconnection and creates radiation in the 15-150 keV band, then the fluence at 200 Mpc would be 10-7 erg cm-2, potentially rendering most merging neutron stars in the advanced LIGO and Virgo detection volumes detectable by Swift BAT.",
    keywords = "gamma-ray burst: general, gravitational waves, magnetohydrodynamics (MHD), stars: neutron, Turbulence, X-rays: general",
    author = "Jonathan Zrake and MacFadyen, {Andrew I.}",
    year = "2013",
    month = "6",
    day = "1",
    doi = "10.1088/2041-8205/769/2/L29",
    language = "English (US)",
    volume = "769",
    journal = "Astrophysical Journal Letters",
    issn = "2041-8205",
    publisher = "IOP Publishing Ltd.",
    number = "2",

    }

    TY - JOUR

    T1 - Magnetic energy production by turbulence in binary neutron star mergers

    AU - Zrake, Jonathan

    AU - MacFadyen, Andrew I.

    PY - 2013/6/1

    Y1 - 2013/6/1

    N2 - The simultaneous detection of electromagnetic and gravitational wave emission from merging neutron star binaries would greatly aid in their discovery and interpretation. By studying turbulent amplification of magnetic fields in local high-resolution simulations of neutron star merger conditions, we demonstrate that magnetar-level (≳ 1016 G) fields are present throughout the merger duration. We find that the small-scale turbulent dynamo converts 60% of the randomized kinetic energy into magnetic fields on a merger timescale. Since turbulent magnetic energy dissipates through reconnection events that accelerate relativistic electrons, turbulence may facilitate the conversion of orbital kinetic energy into radiation. If 10-4 of the ∼1053 erg of orbital kinetic available gets processed through reconnection and creates radiation in the 15-150 keV band, then the fluence at 200 Mpc would be 10-7 erg cm-2, potentially rendering most merging neutron stars in the advanced LIGO and Virgo detection volumes detectable by Swift BAT.

    AB - The simultaneous detection of electromagnetic and gravitational wave emission from merging neutron star binaries would greatly aid in their discovery and interpretation. By studying turbulent amplification of magnetic fields in local high-resolution simulations of neutron star merger conditions, we demonstrate that magnetar-level (≳ 1016 G) fields are present throughout the merger duration. We find that the small-scale turbulent dynamo converts 60% of the randomized kinetic energy into magnetic fields on a merger timescale. Since turbulent magnetic energy dissipates through reconnection events that accelerate relativistic electrons, turbulence may facilitate the conversion of orbital kinetic energy into radiation. If 10-4 of the ∼1053 erg of orbital kinetic available gets processed through reconnection and creates radiation in the 15-150 keV band, then the fluence at 200 Mpc would be 10-7 erg cm-2, potentially rendering most merging neutron stars in the advanced LIGO and Virgo detection volumes detectable by Swift BAT.

    KW - gamma-ray burst: general

    KW - gravitational waves

    KW - magnetohydrodynamics (MHD)

    KW - stars: neutron

    KW - Turbulence

    KW - X-rays: general

    UR - http://www.scopus.com/inward/record.url?scp=84877969253&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84877969253&partnerID=8YFLogxK

    U2 - 10.1088/2041-8205/769/2/L29

    DO - 10.1088/2041-8205/769/2/L29

    M3 - Article

    VL - 769

    JO - Astrophysical Journal Letters

    JF - Astrophysical Journal Letters

    SN - 2041-8205

    IS - 2

    M1 - L29

    ER -