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 language | English |
|---|---|
| Journal | Astrophysical Journal |
| Volume | 697 |
| Issue number | 2 PART 2 |
| DOIs | |
| Publication status | Published - 2009 |
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Keywords
- Gravitational waves
- Hydrodynamics
- Instabilities
- Neutrinos
- Supernovae: general
ASJC Scopus subject areas
- Space and Planetary Science
- Astronomy and Astrophysics
Cite this
Stochastic nature of gravitational waves from supernova explosions with standing accretion shock instability. / Kotake, Kei; Iwakami, Wakana; Ohnishi, Naofumi; Yamada, Shoichi.
In: Astrophysical Journal, Vol. 697, No. 2 PART 2, 2009.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Stochastic nature of gravitational waves from supernova explosions with standing accretion shock instability
AU - Kotake, Kei
AU - Iwakami, Wakana
AU - Ohnishi, Naofumi
AU - Yamada, Shoichi
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
KW - Gravitational waves
KW - Hydrodynamics
KW - Instabilities
KW - Neutrinos
KW - Supernovae: general
UR - http://www.scopus.com/inward/record.url?scp=67649207078&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67649207078&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/697/2/L133
DO - 10.1088/0004-637X/697/2/L133
M3 - Article
VL - 697
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2 PART 2
ER -