Gravitational radiation from standing accretion shock instability in core-collapse supernovae

Kei Kotake, Naofumi Ohnishi, Shoichi Yamada

    Research output: Contribution to journalArticle

    35 Citations (Scopus)

    Abstract

    We present the results of numerical experiments in which we study how asphericities induced by the growth of the standing accretion shock instability (SASI) produce gravitational waveforms in the postbounce phase of core-collapse supernovae. To obtain the neutrino-driven explosions, we parameterize the neutrino fluxes emitted from the central proto-neutron star and approximate the neutrino transfer by a light-bulb scheme. We find that the waveforms due to anisotropic neutrino emissions show a monotonic increase with time, whose amplitudes are up to 2 orders of magnitude larger than those from convective matter motions outside proto-neutron stars. We point out that the amplitudes begin to become larger when the growth of the SASI enters the nonlinear phase, in which the deformation of the shocks and the neutrino anisotropy become large. From the spectrum analysis of the waveforms, we find that the amplitudes from the neutrinos are dominant over those from the matter motions at frequencies below ∼100 Hz, which should be within the detection limits of next-generation detectors such as LCGT and the advanced LIGO for a supernova at 10 kpc. As a contribution to the gravitational wave background, we show that the amplitudes from this source could be larger at frequencies above ∼1 Hz than the primordial gravitational wave backgrounds but, unfortunately, invisible to the proposed space-based detectors.

    Original languageEnglish
    Pages (from-to)406-415
    Number of pages10
    JournalAstrophysical Journal
    Volume655
    Issue number1 I
    DOIs
    Publication statusPublished - 2007 Jan 20

    Fingerprint

    gravitational waves
    supernovae
    neutrinos
    shock
    accretion
    waveforms
    neutron stars
    asphericity
    explosion
    LIGO (observatory)
    gravitational instability
    anisotropy
    detectors
    luminaires
    spectrum analysis
    explosions
    radiation
    experiment
    detector

    Keywords

    • Hydrodynamics
    • Instabilities
    • Neutrinos
    • Supernovae: general

    ASJC Scopus subject areas

    • Space and Planetary Science

    Cite this

    Gravitational radiation from standing accretion shock instability in core-collapse supernovae. / Kotake, Kei; Ohnishi, Naofumi; Yamada, Shoichi.

    In: Astrophysical Journal, Vol. 655, No. 1 I, 20.01.2007, p. 406-415.

    Research output: Contribution to journalArticle

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