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Title: Equation of state effects on gravitational waves from rotating core collapse

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Publication Date:
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Grant/Contract Number:
FG02-97ER25308; NA0000979
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 95; Journal Issue: 6; Related Information: CHORUS Timestamp: 2017-03-30 11:29:01; Journal ID: ISSN 2470-0010
American Physical Society
Country of Publication:
United States

Citation Formats

Richers, Sherwood, Ott, Christian D., Abdikamalov, Ernazar, O’Connor, Evan, and Sullivan, Chris. Equation of state effects on gravitational waves from rotating core collapse. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.95.063019.
Richers, Sherwood, Ott, Christian D., Abdikamalov, Ernazar, O’Connor, Evan, & Sullivan, Chris. Equation of state effects on gravitational waves from rotating core collapse. United States. doi:10.1103/PhysRevD.95.063019.
Richers, Sherwood, Ott, Christian D., Abdikamalov, Ernazar, O’Connor, Evan, and Sullivan, Chris. Wed . "Equation of state effects on gravitational waves from rotating core collapse". United States. doi:10.1103/PhysRevD.95.063019.
title = {Equation of state effects on gravitational waves from rotating core collapse},
author = {Richers, Sherwood and Ott, Christian D. and Abdikamalov, Ernazar and O’Connor, Evan and Sullivan, Chris},
abstractNote = {},
doi = {10.1103/PhysRevD.95.063019},
journal = {Physical Review D},
number = 6,
volume = 95,
place = {United States},
year = {Wed Mar 29 00:00:00 EDT 2017},
month = {Wed Mar 29 00:00:00 EDT 2017}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.95.063019

Citation Metrics:
Cited by: 3works
Citation information provided by
Web of Science

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  • We present results from detailed general relativistic simulations of stellar core collapse to a proto-neutron star, using two different microphysical nonzero-temperature nuclear equations of state as well as an approximate description of deleptonization during the collapse phase. Investigating a wide variety of rotation rates and profiles as well as masses of the progenitor stars and both equations of state, we confirm in this very general setup the recent finding that a generic gravitational wave burst signal is associated with core bounce, already known as type I in the literature. The previously suggested type II (or 'multiple-bounce') waveform morphology does notmore » occur. Despite this reduction to a single waveform type, we demonstrate that it is still possible to constrain the progenitor and postbounce rotation based on a combination of the maximum signal amplitude and the peak frequency of the emitted gravitational wave burst. Our models include to sufficient accuracy the currently known necessary physics for the collapse and bounce phase of core-collapse supernovae, yielding accurate and reliable gravitational wave signal templates for gravitational wave data analysis. In addition, we assess the possibility of nonaxisymmetric instabilities in rotating nascent proto-neutron stars. We find strong evidence that in an iron core-collapse event the postbounce core cannot reach sufficiently rapid rotation to become subject to a classical bar-mode instability. However, many of our postbounce core models exhibit sufficiently rapid and differential rotation to become subject to the recently discovered dynamical instability at low rotation rates.« less
  • Presented in this paper is a technique that we propose for extracting the physical parameters of a rotating stellar core collapse from the observation of the associated gravitational wave signal from the collapse and core bounce. Data from interferometric gravitational wave detectors can be used to provide information on the mass of the progenitor model, precollapse rotation, and the nuclear equation of state. We use waveform libraries provided by the latest numerical simulations of rotating stellar core collapse models in general relativity, and from them create an orthogonal set of eigenvectors using principal component analysis. Bayesian inference techniques are thenmore » used to reconstruct the associated gravitational wave signal that is assumed to be detected by an interferometric detector. Posterior probability distribution functions are derived for the amplitudes of the principal component analysis eigenvectors, and the pulse arrival time. We show how the reconstructed signal and the principal component analysis eigenvector amplitude estimates may provide information on the physical parameters associated with the core collapse event.« less
  • Cited by 46
  • By performing three-dimensional (3D) simulations that demonstrate the neutrino-driven core-collapse supernovae aided by the standing accretion shock instability (SASI), we study how the spiral modes of the SASI can impact the properties of the gravitational-wave (GW) emission. To see the effects of rotation in the nonlinear postbounce phase, we give a uniform rotation on the flow advecting from the outer boundary of the iron core, the specific angular momentum of which is assumed to agree with recent stellar evolution models. We compute fifteen 3D models in which the initial angular momentum and the input neutrino luminosities from the protoneutron starmore » are changed in a systematic manner. By performing a ray-tracing analysis, we accurately estimate the GW amplitudes generated by anisotropic neutrino emission. Our results show that the gravitational waveforms from neutrinos in models that include rotation exhibit a common feature; otherwise, they vary much more stochastically in the absence of rotation. The breaking of the stochasticity stems from the excess of the neutrino emission parallel to the spin axis. This is because the compression of matter is more enhanced in the vicinity of the equatorial plane due to the growth of the spiral SASI modes, leading to the formation of the spiral flows circulating around the spin axis with higher temperatures. We point out that recently proposed future space interferometers like Fabry-Perot-type DECIGO would permit the detection of these signals for a Galactic supernova.« less
  • Immediately following their formation, black holes in the core-collapse stage of massive stars are expected to surge in mass and angular momentum by hyper-accretion. Here  we describe a general framework of extended emission in gravitational waves from non-axisymmetric accretion flows from the fallback matter of the progenitor envelope. This framework shows (a) a maximum efficiency in the conversion of accretion energy into gravitational waves at hyper-accretion rates exceeding a critical value set by the ratio of the quadrupole mass inhomogeneity and viscosity, with (b) a peak characteristic strain amplitude at the frequency f{sub b} = Ω{sub b}/π, where Ω{sub b}more » is the Keplerian angular velocity at which viscous torques equal angular momentum loss in gravitational radiation, with h{sub char} ∝ f{sup 1/6} at f < f{sub b} and h{sub char} ∝ f{sup −1/6} at f > f{sub b}. Upcoming gravitational wave observations may probe this scaling by extracting broadband spectra using time-sliced matched filtering with chirp templates, which were recently developed for identifying turbulence in noisy time series.« less