A5032709770- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- SAS software applications and methods
- Astronomy and Astrophysical Research
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Statistical and numerical algorithms
- Solar and Space Plasma Dynamics
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- Space Satellite Systems and Control
- Planetary Science and Exploration
- Radio Astronomy Observations and Technology
- Geophysics and Sensor Technology
- Adaptive optics and wavefront sensing
- Seismic Waves and Analysis
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Advanced Frequency and Time Standards
Université Côte d'Azur
2015-2024
Observatoire de la Côte d’Azur
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Virginia Tech
2023-2024
Groupe Artémis (France)
2016-2022
Temple University
2022
Astrophysique Relativiste, Théories, Expériences, Métrologie, Instrumentation, Signaux
2013-2020
Observatoire de Paris
2020
University of America
2019
Catholic University of America
2019
On September 14, 2015 at 09:50:45 UTC the two detectors of Laser Interferometer Gravitational-Wave Observatory simultaneously observed a transient gravitational-wave signal. The signal sweeps upwards in frequency from 35 to 250 Hz with peak strain 1.0×10(-21). It matches waveform predicted by general relativity for inspiral and merger pair black holes ringdown resulting single hole. was matched-filter signal-to-noise ratio 24 false alarm rate estimated be less than 1 event per 203,000 years,...
Advanced Virgo is the project to upgrade interferometric detector of gravitational waves, with aim increasing number observable galaxies (and thus detection rate) by three orders magnitude. The now in an advanced construction phase and assembly integration will be completed end 2015. part a network, alongside two LIGO detectors US GEO HF Germany, goal contributing early waves opening new window observation on universe. In this paper we describe main features outline status construction.
We report the observation of a gravitational-wave signal produced by coalescence two stellar-mass black holes. The signal, GW151226, was observed twin detectors Laser Interferometer Gravitational-Wave Observatory (LIGO) on December 26, 2015 at 03:38:53 UTC. initially identified within 70 s an online matched-filter search targeting binary coalescences. Subsequent off-line analyses recovered GW151226 with network signal-to-noise ratio 13 and significance greater than 5 $\sigma$. persisted in...
The EPIC focal plane imaging spectrometers on XMM-Newton use CCDs to record the images and spectra of celestial X-ray sources focused by three mirrors. There is one camera at focus each mirror; two cameras contain seven MOS CCDs, while third uses twelve PN defining a circular field view 30′ diameter in case. were specially developed for EPIC, combine high quality with spectral resolution close Fano limit. A filter wheel carrying kinds transparent light blocking filter, fully closed, open...
The LIGO detection of GW150914 provides an unprecedented opportunity to study the two-body motion a compact-object binary in large-velocity, highly nonlinear regime, and witness final merger excitation uniquely relativistic modes gravitational field. We carry out several investigations determine whether is consistent with black-hole general relativity. find that remnant's mass spin, as determined from low-frequency (inspiral) high-frequency (postinspiral) phases signal, are mutually solution...
In 2009-2010, the Laser Interferometer Gravitational-wave Observa- tory (LIGO) operated together with international partners Virgo and GEO600 as a network to search for gravitational waves of astrophysical origin. The sensitiv- ity these detectors was limited by combination noise sources inherent instrumental design its environment, often localized in time or frequency, that couple into gravitational-wave readout. Here we review performance LIGO instruments during this epoch, work done...
On September 14, 2015, the Laser Interferometer Gravitational-Wave Observatory (LIGO) detected a gravitational-wave transient (GW150914); we characterize properties of source and its parameters. The data around time event were analyzed coherently across LIGO network using suite accurate waveform models that describe gravitational waves from compact binary system in general relativity. GW150914 was produced by nearly equal mass black hole masses 36_{-4}^{+5}M_{⊙} 29_{-4}^{+4}M_{⊙}; for each...
The first observational run of the Advanced LIGO detectors, from September 12, 2015 to January 19, 2016, saw detections gravitational waves binary black hole mergers. In this paper we present full results a search for merger signals with total masses up $100 M_\odot$ and detailed implications our observations these systems. Our search, based on general-relativistic models wave systems, unambiguously identified two signals, GW150914 GW151226, significance greater than $5\sigma$ over observing...
The discovery of the gravitational-wave source GW150914 with Advanced LIGO detectors provides first observational evidence for existence binary black-hole systems that inspiral and merge within age Universe. Such mergers have been predicted in two main types formation models, involving isolated binaries galactic fields or dynamical interactions young old dense stellar environments. measured masses robustly demonstrate relatively "heavy" black holes ($\gtrsim 25\, M_\odot$) can form nature....
Following a major upgrade, the two advanced detectors of Laser Interferometer Gravitational-wave Observatory (LIGO) held their first observation run between September 2015 and January 2016. With strain sensitivity 10^{-23}/sqrt[Hz] at 100 Hz, product observable volume measurement time exceeded that all previous runs within 16 days coincident observation. On 14, 2015, Advanced LIGO observed transient gravitational-wave signal determined to be coalescence black holes [B. P. Abbott et al.,...
On September 14, 2015 at 09:50:45 UTC the two detectors of Laser Interferometer Gravitational-wave Observatory (LIGO) simultaneously observed binary black hole merger GW150914. We report results a matched-filter search using relativistic models compact-object binaries that recovered GW150914 as most significant event during coincident observations between LIGO from 12 to October 20, 2015. was with matched filter signal-to-noise ratio 24 and false alarm rate estimated be less than 1 per...
The LIGO detection of the gravitational wave transient GW150914, from inspiral and merger two black holes with masses ≳30M⊙, suggests a population binary relatively high mass. This observation implies that stochastic gravitational-wave background holes, created incoherent superposition all merging binaries in Universe, could be higher than previously expected. Using properties we estimate energy density such holes. In most sensitive part Advanced Virgo band for backgrounds (near 25 Hz),...
Current interferometric gravitational-wave detectors are limited by quantum noise over a wide range of their measurement bandwidth. One method to overcome the limit is injection squeezed vacuum states light into interferometer's dark port. Here, we report on successful application this technology improve shot sensitivity Advanced Virgo detector. A enhancement up 3.2±0.1 dB beyond achieved. This nonclassical improvement corresponds 5%–8% increase binary neutron star horizon. The squeezing was...
On 14 September 2015, a gravitational wave signal from coalescing black hole binary system was observed by the Advanced LIGO detectors. This paper describes transient noise backgrounds used to determine significance of event (designated GW150914) and presents results investigations into potential correlated or uncorrelated sources in detectors around time event. The were operating nominally at GW150914. We have ruled out environmental influences non-Gaussian instrument either detector as...
A gravitational-wave (GW) transient was identified in data recorded by the Advanced Laser Interferometer Gravitational-wave Observatory (LIGO) detectors on 2015 September 14. The event, initially designated G184098 and later given name GW150914, is described detail elsewhere. By prior arrangement, preliminary estimates of time, significance, sky location event were shared with 63 teams observers covering radio, optical, near-infrared, X-ray, gamma-ray wavelengths ground- space-based...
ABSTRACT A transient gravitational-wave signal, GW150914, was identified in the twin Advanced LIGO detectors on 2015 September at 09:50:45 UTC. To assess implications of this discovery, remained operation with unchanged configurations over a period 39 days around time signal. At detection statistic threshold corresponding to that observed for our search 16 simultaneous two-detector observational data is estimated have false-alarm rate (FAR) , yielding p -value GW150914 . Parameter estimation...
A wide variety of astrophysical and cosmological sources are expected to contribute a stochastic gravitational-wave background. Following the observations GW150914 GW151226, rate mass coalescing binary black holes appear be greater than many previous expectations. As result, background from unresolved compact coalescences is particularly loud. We perform search for isotropic using data Advanced LIGO's first observing run. The display no evidence signal. constrain dimensionless energy density...
Abstract We perform a statistical standard siren analysis of GW170817. Our does not utilize knowledge NGC 4993 as the unique host galaxy optical counterpart to Instead, we consider each within GW170817 localization region potential host; combining redshifts from all galaxies with distance estimate provides an Hubble constant, H 0 . Considering brighter than equally likely binary neutron star merger, find km s −1 Mpc (maximum posteriori and 68.3% highest density posterior interval; assuming...
We present the result of searches for gravitational waves from 200 pulsars using data first observing run Advanced LIGO detectors. find no significant evidence a gravitational-wave signal any these pulsars, but we are able to set most constraining upper limits yet on their amplitudes and ellipticities. For eight our give bounds that improvements over indirect spin-down limit values. another 32, within factor 10 limit, it is likely some will be reachable in future runs advanced detector....
ABSTRACT We report here the non-detection of gravitational waves from merger binary–neutron star systems and neutron star–black hole during first observing run Advanced Laser Interferometer Gravitational-wave Observatory (LIGO). In particular, we searched for gravitational-wave signals with component masses dimensionless spins <0.05. also same parameters, black mass , no restriction on spin magnitude. assess sensitivity two LIGO detectors to these find that they could have detected...
The recent announcement by LIGO of the detection gravitational-wave signal GW150914 has ignited tremendous interest. two manuscripts highlighted here detail impressive analysis performed to identify a specific black hole binary merger as source GW150914. papers describe independent methods analysis: matching numerical-relativity-generated templates and unmodeled burst analyses. together provide detailed virtually incontrovertible evidence, standards experimental physics, gravitational waves...
The discovery of the first electromagnetic counterpart to a gravitational wave signal has generated follow-up observations by over 50 facilities world-wide, ushering in new era multi-messenger astronomy. In this paper, we present event GW170817 and its SSS17a/DLT17ck (IAU label AT2017gfo) 14 Australian telescopes partner observatories as part Australian-based Australian-led research programs. We report early- late-time multi-wavelength observations, including optical imaging spectroscopy,...