Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session S14: Advanced LIGO Methods and Results III |
Hide Abstracts |
Sponsoring Units: GGR DAP Chair: Vivien Raymond, Max Planck Institute for Gravitational Physics Room: 251AB |
Monday, April 18, 2016 1:30PM - 1:42PM |
S14.00001: Using waveform complexity in the search for transient gravitational wave events Margaret Millhouse, Tyson Littenberg, Neil Cornish, Jonah Kanner Searches for short, unmodeled gravitational waves using ground based interferometers are impacted by transient noise artifacts, or ``glitches'', which can be difficult to distinguish from gravitational waves of astrophysical origin. The BayesWave algorithm presents a novel method of distinguishing glitches from short duration astrophysical signals by using waveform complexity to rank candidate events. In addition to identifying signals and glitches, BayesWave also provides robust waveform reconstruction with minimal assumptions. I will showcase the algorithm's glitch rejection capabilities, and discuss the performance of BayesWave during Advanced LIGO's first observational run. [Preview Abstract] |
Monday, April 18, 2016 1:42PM - 1:54PM |
S14.00002: Inferring the physical properties of gravitational wave sources from multi-wavelet waveform reconstructions Tyson Littenberg The BayesWave burst detection and characterization algorithm was used during the first Advanced LIGO observing run as a follow-up analysis to candidate transient gravitational wave events. Among the BayesWave data products are robust reconstructed waveforms and probability density functions for metrics such as duration, bandwidth, etc. used to characterize the waveforms. We will demonstrate how the waveform metrics can be used to infer the astrophysical nature of a gravitational wave source, and present the status of BayesWave studies from the first advanced LIGO observing run. [Preview Abstract] |
Monday, April 18, 2016 1:54PM - 2:06PM |
S14.00003: Hierarchical searches for gravitational-wave transients with Advanced LIGO Ryan Lynch As part of the multiple pipelines invoked in the search for gravitational-wave transients with the Advanced LIGO detectors, we have implemented an independent hierarchical algorithm to complement the constrained likelihood approach that has been used in all previous searches. This hierarchical search combines an incoherent, excess-power analysis of single interferometer strain data using the Q-transform with a fully coherent Markov chain Monte Carlo Bayesian evidence follow-up. The pipeline has been designed to operate in real-time. We will present the status of the search for unmodeled gravitational-wave transients with Advanced LIGO using this pipeline and discuss its performance during O1 as well the prospects for the future observing runs. [Preview Abstract] |
Monday, April 18, 2016 2:06PM - 2:18PM |
S14.00004: Observing Gravitational Waves from Core-Collapse Supernovae in the Advanced Detector Era Sarah Gossan The next galactic core-collapse supernova (CCSN) has already exploded, and its electromagnetic (EM) waves, neutrinos, and gravitational waves (GWs) may arrive at any moment. We present an extensive study on the potential sensitivity of prospective detection scenarios for GWs from CCSN sources within 5Mpc, using realistic noise at the predicted sensitivity of the Advanced LIGO and Advanced Virgo detectors for 2015, 2017, and 2019. We make statements on the detectability of the core collapse event for sources within the galaxy and Large Magellanic Cloud, for which there will be an associated neutrino burst, and consider the exclusion of extreme post-core collapse emission models for more distant SNe with an associated EM signature. Given a detection of GW from core collapse, we discuss the potential to infer the CCSN explosion mechanism. [Preview Abstract] |
Monday, April 18, 2016 2:18PM - 2:30PM |
S14.00005: Advanced LIGO searches for gravitational waves associated with gamma-ray bursts Dipongkar Talukder Gamma-ray bursts (GRBs) are the most luminous, cataclysmic events observed in our universe. The progenitor scenarios of GRBs include mergers of binary systems composed of neutron stars or a neutron star and a stellar-mass black hole, core collapse of massive stars, and perturbed neutron stars. Gravitational-wave emission is expected to accompany such events. The first observing run of Advanced LIGO began in September 2015. We are currently searching data for gravitational waves associated with these events. We present the status of the searches for gravitational waves associated with GRBs detected by gamma-ray satellites during Advanced LIGO's first observing run. [Preview Abstract] |
Monday, April 18, 2016 2:30PM - 2:42PM |
S14.00006: Searching for the stochastic gravitational-wave background in Advanced LIGO's first observing run S. Gwynne Crowder Over the course of the next several years, Advanced LIGO and Advanced Virgo expect to achieve unparalleled sensitivity to gravitational waves. The advanced detector era has recently commenced with LIGO's first observing run. A potential source of gravitational waves is the stochastic gravitational-wave background, a background predicted from the superposition of sources such as compact binary coalescences, supernovae, and inflation. In this talk, we discuss the search for the stochastic background in the initial observing run. [Preview Abstract] |
Monday, April 18, 2016 2:42PM - 2:54PM |
S14.00007: Searches for continuous gravitational waves with Advanced LIGO Benjamin Owen The Advanced LIGO interferometers have completed their first observing run at unprecedented sensitivity, and now a variety of searches for continuous gravitational waves are underway. I summarize the activities and plans of the continuous waves data analysis group for Advanced LIGO and Virgo data. [Preview Abstract] |
Monday, April 18, 2016 2:54PM - 3:06PM |
S14.00008: Improving the Sensitivity of Searches for Continuous Gravitational Waves from Galactic Neutron Stars in Binary Systems Ansel Neunzert, Keith Riles While non-axisymmetric spinning neutron stars are expected to emit nearly monochromatic gravitational radiation, such stars in binary systems emit frequency-modulated waves. For a previously unknown binary source, the modulations require a large expansion of the parameter space in searches for the emitted waves. TwoSpect is a previously developed search method for gravitational waves from neutron stars in binaries, which makes use of templates placed in the parameter space of interest. For searches over large parameter space regions, where a fully templated approach would be too computationally demanding, TwoSpect uses a pre-template stage, at the cost of sensitivity loss. Here, we discuss a method of analysis with TwoSpect which bypasses the pre-template stage, but samples parameter space more sparsely than a fully templated search, to achieve an intermediate balance of sensitivity and computational cost. This method aims to make directed, templated searches with TwoSpect more computationally feasible, and may prove useful in all-sky searches. [Preview Abstract] |
Monday, April 18, 2016 3:06PM - 3:18PM |
S14.00009: Searching for Gravitational Waves from Unknown Galactic Neutron Stars -- Evaluation of the PowerFlux Pipeline Orion Sauter, Keith Riles, Vladimir Dergachev Isolated rotating neutron stars with significant non-axisymmetry can emit gravitational radiation of nearly constant frequency and amplitude. Because the resulting amplitudes are expected to be extremely weak, long time integrations must be carried out to detect a signal. This task is made difficult in all-sky searches for unknown galactic stars by the motion of the Earth (daily rotation and orbital motion) which induces substantial, location-dependent modulations of detected frequency and amplitude. Several software pipelines have been developed to search for such signals in recent data from Advanced LIGO. An evaluation of the performances of these pipelines in data containing instrumental artifacts has been carried out in a mock data challenge, using software injections in Initial LIGO data, We present here the performance of the PowerFlux search program in a search band of 40-2000 Hz, including detection of "blind" injections. The program uses a multi-stage hierarchical algorithm, based on semi-coherent and loosely coherent power sums. Results indicate that PowerFlux is well suited to analysis of Advanced LIGO data. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700