Bulletin of the American Physical Society
2008 APS April Meeting and HEDP/HEDLA Meeting
Volume 53, Number 5
Friday–Tuesday, April 11–15, 2008; St. Louis, Missouri
Session B10: Gravitational Waves from Compact Binary Inspirals and Mergers |
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Sponsoring Units: GGR DAP Chair: Duncan Brown, Syracuse University Room: Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), St. Louis A |
Saturday, April 12, 2008 10:45AM - 10:57AM |
B10.00001: Searches for compact binary inspirals in LIGO data Drew Keppel We describe the methodology and subtleties associated with searches for gravitational waves from coalescing compact binary systems, which have been applied to the search for low mass $(M_{total} = 2-35 M_{sun})$ compact binary coalescence waveforms in the LIGO Fifth Science run (S5) first year data. We discuss the astrophysics of coalescing binaries, including the predicted waveforms and source populations. We describe the pipeline employed by the LSC to search for such waveforms in LIGO data, how we suppress false signals originating from instrumental noise, how we evaluate the search efficiency for systems which may include spinning component masses, how we establish confidence in likely detection candidates, and how we formulate Bayesian upper limits on the coalescence rate as a function of total mass of the binary system. [Preview Abstract] |
Saturday, April 12, 2008 10:57AM - 11:09AM |
B10.00002: Data quality and vetoes in searches for compact binary coalescences and bursts in LIGO's fifth science run Jacob Slutsky Searches for gravitational waves from compact binary coalescences (CBCs), as well as for unmodeled sources (Bursts), are hindered by the presence of transient detector noise, which can produce false alarms. Using auxiliary channels and the gravitational wave channel itself, the LIGO Scientific Collaboration has identified a variety of instrumental and environmental artifacts that lead to false signals. We find time intervals affected by these artifacts, and use them as vetoes for CBC and Burst searches in LIGO's fifth science run. [Preview Abstract] |
Saturday, April 12, 2008 11:09AM - 11:21AM |
B10.00003: Detection confidence tests for Inspiral Candidate Events Sarah Caudill In order to detect gravitational-wave signals from compact binary inspiral, the LSC-Virgo Compact Binary Coalescence group is using an analysis pipeline which aims to reduce the false alarm rate without rejecting gravitational-wave signals. However, because of the non-Gaussian, non-stationary noise exhibited by the LIGO detectors, a large number of false alarms are found at the end of the pipeline. The Compact Binary Coalescence group has been developing a detection checklist for the validation of candidate-events. This detection checklist consists of a series of further tests including data quality checks, analysis of the candidate appearance, parameter consistency studies, coherent analysis, which aim to corroborate a detection or to eliminate a false alarm. In this talk, the methodology used for candidate validation will be presented and illustrated with interesting examples of candidates. [Preview Abstract] |
Saturday, April 12, 2008 11:21AM - 11:33AM |
B10.00004: Bayesian inference on spinning compact-binary inspirals with ground-based gravitational-wave laser interferometers Marc van der Sluys, Christian Roever, Alexander Stroeer, Nelson Christensen, Vicky Kaloger, Renate Meyer, Alberto Vecchio, Ilya Mandel We present a Markov-Chain Monte-Carlo (MCMC) technique to study the source parameters of signals from the inspirals of stellar-mass compact binaries observable with ground-based gravitational-wave detectors such as LIGO and Virgo. We use a number of modifications to the standard MCMC in order to efficiently probe the parameter space while keeping the algorithm suitable for a wide range of signals. We shall discuss the performance of the MCMC algorithm and the typical measurement accuracy of the source parameters as a function of the binary parameters and the number of detectors in the network. We will show that despite the lower positional accuracy compared to other astronomical observations, an association of a gravitational- wave event with e.g. an electomagnetic detection is possible with three or even two 4-km-size interferometers. [Preview Abstract] |
Saturday, April 12, 2008 11:33AM - 11:45AM |
B10.00005: Properties and application of statistical methods to estimating compact binary merger rates. Rahul Biswas, Patrick Brady, Jolien Creighton, Stephen Fairhurst The use of the loudest observed event to generate statistical statements about rate and strength has become standard in searches for gravitational waves from compact binaries and pulsars. The Bayesian formulation of the method is generalized to allow for uncertainties both in the background estimate and in the properties of the population being constrained. The method is also extended to allow rate interval construction. Finally, it is shown how to combine the results from multiple experiments and a comparison is drawn between the upper limit obtained in a single search and the upper limit obtained by combining the results of two experiments each of half the original duration. [Preview Abstract] |
Saturday, April 12, 2008 11:45AM - 11:57AM |
B10.00006: Harmonic correlation for eccentric binaries in gravitational wave observations Shane L. Larson, Ronald W. Hellings Binary systems will be among the most numerous sources detected by interferometric gravitational wave detectors. In many instances, the binaries will have non-zero orbital eccentricities, producing power in the Fourier spectrum at the fundamental orbital frequency and its higher harmonics. This talk describes a binary search technique called \emph{harmonic correlation} which exploits the harmonic structure of the signal to identify binaries in gravitational wave data streams, even at low signal-to-noise ratios. [Preview Abstract] |
Saturday, April 12, 2008 11:57AM - 12:09PM |
B10.00007: Equation of state effects on gravitational waveforms for binary neutron stars Jocelyn Read, Jolien Creighton, Masaru Shibata, John Friedman, Koji Uryu, Charalampos Markakis Numerical simulations of equal-mass neutron stars, including several orbits of inspiral, merger, and post-merger oscillations, are used to generate gravitational waveforms for systematically varied equations of state (EOS). We discuss matching these waveforms to PN waveforms with tidal corrections to generate full templates for preliminary work on data analysis and the extraction of EOS parameters, using Advanced LIGO noise curves for broadband and high frequency narrowband tuning. [Preview Abstract] |
Saturday, April 12, 2008 12:09PM - 12:21PM |
B10.00008: Gravitational wave observations of spinning black holes Birjoo Vaishnav, Deirdre Shoemaker, Frank Herrmann, Ian Hinder, Richard O'Shaughnessy We present studies of the effect of spin precession on gravitational radiation in the last few orbits of merging massive black hole binaries Several numerical relativity waveforms for different initial spin orientations are now available. We study the variation of the merger/ringdown signal to noise ratio fof massive and intermediate mass binaries $(M_{total} >50M_\odot)$ on the initial spin orientations, and find that the signal strength and hence the detection volume accessible to ground based detectors varies significantly for generic initial spin orientations. This could be important in constraining astrophysical models of binary black hole mergers. [Preview Abstract] |
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