Gravitational waves from neutron stars: promises and challenges

Andersson, Nils; Ferrari, Valeria; Jones, D. I.; Kokkotas, Kostas D.; Krishnan, B.; Read, J.; Rezzolla, Luciano; Zink, Burkhard

doi:10.1007/s10714-010-1059-4

Cited by 177 publications

(176 citation statements)

References 176 publications

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“…The fraction of NSs accessible to the gravitational window is uncertain. The biggest uncertainty is the ellipticity that can be sustained in a NS, with largest estimates of ∼ 10 −4 [431], but more typically ∼ 10 −6 or smaller [432]. Statistical arguments suggest that a NS with ellipticity = 10 −6 could be close enough to have an amplitude of h max 1.6 × 10 −24 in the frequency range 250-680 Hz [433].…”

Section: A Menagerie Of Neutron-star Sourcesmentioning

confidence: 99%

Sources of Gravitational Waves: Theory and Observations

Buonanno

Sathyaprakash²

2015

General Relativity and Gravitation

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Section: A Menagerie Of Neutron-star Sourcesmentioning

confidence: 99%

Sources of Gravitational Waves: Theory and Observations

Buonanno

Sathyaprakash²

2015

General Relativity and Gravitation

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“…This provides an extremely large accelerated quadrupole moment (e.g., [36]), resulting in a GW burst signal that, depending on the amount of angular momentum in the inner core, can be detected by the upcoming advanced-generation of GW detectors out to 10 − 100 kpc [37][38][39]. After core bounce, on a timescale of tens of milliseconds, non-axisymmetric dynamics may develop due to rotational shear instabilities (e.g., [40][41][42][43][44]), leading to longer-term quasi-periodic GW emission.…”

Section: Introductionmentioning

confidence: 99%

Measuring the angular momentum distribution in core-collapse supernova progenitors with gravitational waves

et al. 2014

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The late collapse, core bounce, and the early postbounce phase of rotating core collapse leads to a characteristic gravitational wave (GW) signal. The precise shape of the signal is governed by the interplay of gravity, rotation, nuclear equation of state (EOS), and electron capture during collapse. We explore the detailed dependence of the signal on total angular momentum and its distribution in the progenitor core by means of a large set of axisymmetric general-relativistic hydrodynamics core collapse simulations, in which we systematically vary the initial angular momentum distribution in the core. Our simulations include a microphysical finite-temperature EOS, an approximate electron capture treatment during collapse, and a neutrino leakage scheme for the postbounce evolution. Our results show that the total angular momentum of the inner core at bounce and the inner core's ratio of rotational kinetic energy to gravitational energy T /|W | are both robust parameters characterizing the GW signal. We find that the precise distribution of angular momentum is relevant only for very rapidly rotating cores with T /|W | 8% at bounce. We construct a numerical template bank from our baseline set of simulations, and carry out additional simulations to generate trial waveforms for injection into simulated Advanced LIGO noise at a fiducial galactic distance of 10 kpc. Using matched filtering, we show that for an optimally-oriented source and Gaussian noise, Advanced LIGO could measure the total angular momentum to within ±20%, for rapidly rotating cores. For most waveforms, the nearest known degree of precollapse differential rotation is correctly inferred by both our matched filtering analysis and an alternative Bayesian model selection approach. We test our results for robustness against systematic uncertainties by injecting waveforms from simulations utilizing a different EOS and and variations in the electron fraction in the inner core. The results of these tests show that these uncertainties significantly reduce the accuracy with which the total angular momentum and its precollapse distribution can be inferred from observations.

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“…A precise source position from an EM counterpart would help break this degeneracy (Dalal et al 2006;Nissanke et al 2010). High precision parameter estimation may even constrain the NS equation of state (Cutler et al 1993;Vallisneri 2000;Flanagan & Hinderer 2008;Andersson et al 2011;Pannarale et al 2011;Hinderer et al 2010).…”

Section: Investigations Enabled By Joint Gw/em Observationsmentioning

confidence: 99%

Implementation and testing of the first prompt search for gravitational wave transients with electromagnetic counterparts

Abadie

Abbott

et al. 2012

A&A

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Article published by EDP Sciences A124, page 1 of 15 A&A 539, A124 (2012) ABSTRACT Aims. A transient astrophysical event observed in both gravitational wave (GW) and electromagnetic (EM) channels would yield rich scientific rewards. A first program initiating EM follow-ups to possible transient GW events has been developed and exercised by the LIGO and Virgo community in association with several partners. In this paper, we describe and evaluate the methods used to promptly identify and localize GW event candidates and to request images of targeted sky locations. Methods. During two observing periods (Dec. 17, 2009 to Jan. 8, 2010 and Sep. 2 to Oct. 20, 2010, a low-latency analysis pipeline was used to identify GW event candidates and to reconstruct maps of possible sky locations. A catalog of nearby galaxies and Milky Way globular clusters was used to select the most promising sky positions to be imaged, and this directional information was delivered to EM observatories with time lags of about thirty minutes. A Monte Carlo simulation has been used to evaluate the low-latency GW pipeline's ability to reconstruct source positions correctly.Results. For signals near the detection threshold, our low-latency algorithms often localized simulated GW burst signals to tens of square degrees, while neutron star/neutron star inspirals and neutron star/black hole inspirals were localized to a few hundred square degrees. Localization precision improves for moderately stronger signals. The correct sky location of signals well above threshold and originating from nearby galaxies may be observed with ∼50% or better probability with a few pointings of wide-field telescopes.

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Gravitational waves from neutron stars: promises and challenges

Cited by 177 publications

References 176 publications

Sources of Gravitational Waves: Theory and Observations

Sources of Gravitational Waves: Theory and Observations

Measuring the angular momentum distribution in core-collapse supernova progenitors with gravitational waves

Implementation and testing of the first prompt search for gravitational wave transients with electromagnetic counterparts

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