scholarly journals Bayesian inference for compact binary coalescences with bilby: validation and application to the first LIGO–Virgo gravitational-wave transient catalogue

2020 ◽  
Vol 499 (3) ◽  
pp. 3295-3319 ◽  
Author(s):  
I M Romero-Shaw ◽  
C Talbot ◽  
S Biscoveanu ◽  
V D’Emilio ◽  
G Ashton ◽  
...  
Keyword(s):  
Bayesian Inference ◽  
Gravitational Wave ◽  
Observational Astronomy ◽  
Compact Binary ◽  
Scalable Inference ◽  
Binary Mergers ◽  
Inference Techniques ◽  
User Friendly ◽  
Growing Population ◽  
Extract Information

ABSTRACT Gravitational waves provide a unique tool for observational astronomy. While the first LIGO–Virgo catalogue of gravitational-wave transients (GWTC-1) contains 11 signals from black hole and neutron star binaries, the number of observations is increasing rapidly as detector sensitivity improves. To extract information from the observed signals, it is imperative to have fast, flexible, and scalable inference techniques. In a previous paper, we introduced bilby: a modular and user-friendly Bayesian inference library adapted to address the needs of gravitational-wave inference. In this work, we demonstrate that bilby produces reliable results for simulated gravitational-wave signals from compact binary mergers, and verify that it accurately reproduces results reported for the 11 GWTC-1 signals. Additionally, we provide configuration and output files for all analyses to allow for easy reproduction, modification, and future use. This work establishes that bilby is primed and ready to analyse the rapidly growing population of compact binary coalescence gravitational-wave signals.

scholarly journals A Joint Fermi-GBM and LIGO/Virgo Analysis of Compact Binary Mergers from the First and Second Gravitational-wave Observing Runs

2020 ◽  
Vol 893 (2) ◽  
pp. 100 ◽  
Author(s):  
R. Hamburg ◽  
C. Fletcher ◽  
E. Burns ◽  
A. Goldstein ◽  
E. Bissaldi ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Compact Binary ◽  
Binary Mergers

scholarly journals Prospects for gravitational-wave polarization tests from compact binary mergers with future ground-based detectors

2019 ◽  
Vol 100 (4) ◽  
Author(s):  
Hiroki Takeda ◽  
Atsushi Nishizawa ◽  
Koji Nagano ◽  
Yuta Michimura ◽  
Kentaro Komori ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Wave Polarization ◽  
Compact Binary ◽  
Binary Mergers

scholarly journals Kilonova/Macronova Emission from Compact Binary Mergers

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Masaomi Tanaka
Keyword(s):  
Gravitational Wave ◽  
Near Infrared ◽  
Expansion Velocity ◽  
Infrared Excess ◽  
Wave Source ◽  
Compact Binary ◽  
Binary Mergers ◽  
Infrared Wavelengths ◽  
Absolute Magnitudes ◽  
Review Current

We review current understanding of kilonova/macronova emission from compact binary mergers (mergers of two neutron stars or a neutron star and a black hole). Kilonova/macronova is emission powered by radioactive decays ofr-process nuclei and it is one of the most promising electromagnetic counterparts of gravitational wave sources. Emission from the dynamical ejecta of ~0.01M⊙is likely to have a luminosity of ~1040–1041 erg s−1with a characteristic timescale of about 1 week. The spectral peak is located in red optical or near-infrared wavelengths. A subsequent accretion disk wind may provide an additional luminosity or an earlier/bluer emission if it is not absorbed by the precedent dynamical ejecta. The detection of near-infrared excess in short GRB 130603B and possible optical excess in GRB 060614 supports the concept of the kilonova/macronova scenario. At 200 Mpc distance, a typical peak brightness of kilonova/macronova with0.01M⊙ejecta is about 22 mag and the emission rapidly fades to >24 mag within ~10 days. Kilonova/macronova candidates can be distinguished from supernovae by (1) the faster time evolution, (2) fainter absolute magnitudes, and (3) redder colors. Since the high expansion velocity (v~0.1–0.2c) is a robust outcome of compact binary mergers, the detection of smooth spectra will be the smoking gun to conclusively identify the gravitational wave source.

scholarly journals Low-Γ jets from Compact Binary Mergers as Candidate Electromagnetic Counterparts to Gravitational Wave Sources

2016 ◽  
Vol 12 (S324) ◽  
pp. 66-69
Author(s):  
Gavin P. Lamb ◽  
Shiho Kobayashi
Keyword(s):  
Gravitational Wave ◽  
Gamma Ray ◽  
Ambient Medium ◽  
Radioactive Decay ◽  
Prompt Gamma ◽  
Late Time ◽  
Astrophysical Jets ◽  
Power Law Distribution ◽  
Compact Binary ◽  
Binary Mergers

AbstractCompact binary mergers, with neutron stars or neutron star and black-hole components, are thought to produce various electromagnetic counterparts: short gamma-ray bursts (GRBs) from ultra-relativistic jets followed by broadband afterglow; semi-isotropic kilonova from radioactive decay of r-process elements; and late time radio flares; etc. If the jets from such mergers follow a similar power-law distribution of Lorentz factors as other astrophysical jets then the population of merger jets will be dominated by low-Γ values. The prompt gamma-rays associated with short GRBs would be suppressed for a low-Γ jet and the jet energy will be released as X-ray/optical/radio transients when a shock forms in the ambient medium. Using Monte Carlo simulations, we study the properties of such transients as candidate electromagnetic counterparts to gravitational wave sources detectable by LIGO/Virgo. Approximately 78% of merger-jets result in failed GRB with optical peaks 14-22 magnitude and an all-sky rate of 2-3 per year.

scholarly journals Quantum expander for gravitational-wave observatories

2019 ◽  
Vol 8 (1) ◽  
Author(s):  
Mikhail Korobko ◽  
Yiqiu Ma ◽  
Yanbei Chen ◽  
Roman Schnabel
Keyword(s):  
Gravitational Wave ◽  
Laser Light ◽  
Low Frequency ◽  
Optical Resonators ◽  
High Signal ◽  
Quantum Uncertainty ◽  
Frequency Sensitivity ◽  
The Past ◽  
Compact Binary ◽  
Binary Mergers

AbstractThe quantum uncertainty of laser light limits the sensitivity of gravitational-wave observatories. Over the past 30 years, techniques for squeezing the quantum uncertainty, as well as for enhancing gravitational-wave signals with optical resonators have been invented. Resonators, however, have finite linewidths, and the high signal frequencies that are produced during the highly scientifically interesting ring-down of astrophysical compact-binary mergers still cannot be resolved. Here, we propose a purely optical approach for expanding the detection bandwidth. It uses quantum uncertainty squeezing inside one of the optical resonators, compensating for the finite resonators’ linewidths while keeping the low-frequency sensitivity unchanged. This quantum expander is intended to enhance the sensitivity of future gravitational-wave detectors, and we suggest the use of this new tool in other cavity-enhanced metrological experiments.

scholarly journals Unmodelled clustering methods for gravitational wave populations of compact binary mergers

2019 ◽  
Vol 488 (3) ◽  
pp. 3810-3817 ◽  
Author(s):  
Jade Powell ◽  
Simon Stevenson ◽  
Ilya Mandel ◽  
Peter Tiňo
Keyword(s):  
Gravitational Wave ◽  
Gaussian Mixture ◽  
Difficult Case ◽  
Clustering Methods ◽  
Compact Binaries ◽  
Mass Distributions ◽  
Compact Binary ◽  
Binary Mergers ◽  
Spin Distributions ◽  
Mixture Model Clustering

ABSTRACT The mass and spin distributions of compact binary gravitational-wave sources are currently uncertain due to complicated astrophysics involved in their formation. Multiple sub-populations of compact binaries representing different evolutionary scenarios may be present amongst sources detected by Advanced LIGO and Advanced Virgo. In addition to hierarchical modelling, unmodelled methods can aid in determining the number of sub-populations and their properties. In this paper, we apply Gaussian mixture model clustering to 1000 simulated gravitational-wave compact binary sources from a mixture of five sub-populations. Using both mass and spin as input parameters, we determine how many binary detections are needed to accurately determine the number of sub-populations and their mass and spin distributions. In the most difficult case that we consider, where two sub-populations have identical mass distributions but differ in their spin, which is poorly constrained by gravitational-wave detections, we find that ∼400 detections are needed before we can identify the correct number of sub-populations.

scholarly journals Analysis framework for the prompt discovery of compact binary mergers in gravitational-wave data

2017 ◽  
Vol 95 (4) ◽  
Author(s):  
Cody Messick ◽  
Kent Blackburn ◽  
Patrick Brady ◽  
Patrick Brockill ◽  
Kipp Cannon ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Analysis Framework ◽  
Wave Data ◽  
Compact Binary ◽  
Binary Mergers
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