Stochastic nature of gravitational waves from supernova explosions with standing accretion shock instability

Kei Kotake, Wakana Iwakami, Naofumi Ohnishi, Shoichi Yamada

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

We study the properties of gravitational waves (GWs) based on three-dimensional (3D) simulations, which demonstrate neutrino-driven explosions aided by standing accretion shock instability (SASI). Pushed by evidence supporting slow rotation prior to core collapse, we focus on the asphericities in neutrino emissions and matter motions outside the protoneutron star. By performing a ray-tracing calculation in 3D, we estimate accurately the gravitational waveforms from anisotropic neutrino emissions. In contrast to the previous work assuming axisymmetry, we find that the gravitational waveforms vary much more stochastically because the explosion anisotropies depend sensitively on the growth of SASI which develops chaotically in all directions. Our results show that the GW spectrum has its peak near 100 Hz, reflecting SASI-induced matter overturns of O(10) ms. We point out that the detection of such signals, possibly visible to the LIGO-class detectors for a Galactic supernova, could be an important probe into the long-veiled explosion mechanism.

Original languageEnglish
Pages (from-to)L133-L136
JournalAstrophysical Journal
Volume697
Issue number2 PART 2
DOIs
Publication statusPublished - 2009 Jan 1

Keywords

  • Gravitational waves
  • Hydrodynamics
  • Instabilities
  • Neutrinos
  • Supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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