Supernova seismology

Gravitational wave signatures of rapidly rotating core collapse

Jim Fuller, Hannah Klion, Ernazar Abdikamalov, Christian D. Ott

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    Gravitational waves (GW) generated during a core-collapse supernova open a window into the heart of the explosion. At core bounce, progenitors with rapid core rotation rates exhibit a characteristic GW signal which can be used to constrain the properties of the core of the progenitor star. We investigate the dynamics of rapidly rotating core collapse, focusing on hydrodynamic waves generated by the core bounce, and the GW spectrum they produce. The centrifugal distortion of the rapidly rotating proto-neutron star (PNS) leads to the generation of axisymmetric quadrupolar oscillations within the PNS and surrounding envelope. Using linear perturbation theory, we estimate the frequencies, amplitudes, damping times, and GW spectra of the oscillations. Our analysis provides a qualitative explanation for several features of the GW spectrum and shows reasonable agreement with non-linear hydrodynamic simulations, although a few discrepancies due to non-linear/rotational effects are evident. The dominant early post-bounce GW signal is produced by the fundamental quadrupolar oscillation mode of the PNS, at a frequency 0.70 ≲ f ≲ 0.80 kHz, whose energy is largely trapped within the PNS and leaks out on a ~10-ms time-scale. Quasi-radial oscillations are not trapped within the PNS and quickly propagate outwards until they steepen into shocks. Both the PNS structure and Coriolis/centrifugal forces have a strong impact on the GW spectrum, and a detection of the GW signal can therefore be used to constrain progenitor properties.

    Original languageEnglish
    Pages (from-to)414-427
    Number of pages14
    JournalMonthly Notices of the Royal Astronomical Society
    Volume450
    Issue number1
    DOIs
    Publication statusPublished - Mar 27 2015

    Fingerprint

    seismology
    gravitational waves
    wave spectrum
    supernovae
    signatures
    neutron stars
    oscillation
    oscillations
    hydrodynamics
    damping
    explosion
    centrifugal force
    perturbation
    timescale
    explosions
    envelopes
    perturbation theory
    shock
    simulation
    energy

    Keywords

    • Gravitational waves
    • Hydrodynamics
    • Stars: oscillations
    • Stars: rotation
    • Supernovae: general
    • Waves

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Supernova seismology : Gravitational wave signatures of rapidly rotating core collapse. / Fuller, Jim; Klion, Hannah; Abdikamalov, Ernazar; Ott, Christian D.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 450, No. 1, 27.03.2015, p. 414-427.

    Research output: Contribution to journalArticle

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