Einstein@Home All-sky Search for Continuous Gravitational Waves in LIGO O2 Public Data

@article{Steltner2020EinsteinHomeAS,
  title={Einstein@Home All-sky Search for Continuous Gravitational Waves in LIGO O2 Public Data},
  author={B. Steltner and Maria Alessandra Papa and H. B. Eggenstein and Bruce Allen and Vladimir Dergachev and Reinhard Prix and B. Machenschalk and Sin'ead Walsh and S. J. Zhu and O. Behnke and S. Kwang},
  journal={The Astrophysical Journal},
  year={2020},
  volume={909}
}
We conduct an all-sky search for continuous gravitational waves in the LIGO O2 data from the Hanford and Livingston detectors. We search for nearly monochromatic signals with frequency 20.0 Hz ≤ f ≤ 585.15 Hz and spin-down Hz s−1. We deploy the search on the Einstein@Home volunteer-computing project and follow-up the waveforms associated with the most significant results with eight further search stages, reaching the best sensitivity ever achieved by an all-sky survey up to 500 Hz. Six of the… 
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References

SHOWING 1-10 OF 45 REFERENCES
Results from the First All-Sky Search for Continuous Gravitational Waves from Small-Ellipticity Sources.
TLDR
The search for continuous gravitational-wave signals with frequencies in the 500-1700 Hz range targeting neutron stars with ellipticity of 10^{-8} is presented, with double the sensitivity over any other result on the same data.
Search for continuous gravitational waves from Fomalhaut b in the second Advanced LIGO observing run with a hidden Markov model
Results are presented from a semicoherent search for continuous gravitational waves from a nearby neutron star candidate, Fomalhaut b, using data collected in the second observing run of Advanced
Search for continuous gravitational waves: improving robustness versus instrumental artifacts
The standard multidetector F-statistic for continuous gravitational waves is susceptible to false alarms from instrumental artifacts, for example monochromatic sinusoidal disturbances (“lines”). This
Characterizing the continuous gravitational-wave signal from boson clouds around Galactic isolated black holes
Ultralight bosons can form large clouds around stellar-mass black holes via the superradiance instability. Through processes such as annihilation, these bosons can source continuous gravitational
The permanent ellipticity of the neutron star in PSR J1023+0038
A millisecond pulsar having an ellipticity, which is an asymmetric mass distribution around its spin-axis, could emit continuous gravitational waves, which have not been detected so far. An
Identification and removal of non-Gaussian noise transients in the time domain for gravitational wave searches
TLDR
This work presents a new method to remove non-Gaussian noise transients in gravitational wave data that preserves more data than previously achieved, while obtaining the same, when not higher, noise reduction.
Sensitivity and performance of the Advanced LIGO detectors in the third observing run
On April 1st, 2019, the Advanced Laser Interferometer Gravitational-Wave Observatory (aLIGO), joined by the Advanced Virgo detector, began the third observing run, a year-long dedicated search for
Triaxially deformed freely precessing neutron stars: continuous electromagnetic and gravitational radiation
The shape of a neutron star (NS) is closely linked to its internal structure and the equation of state of supranuclear matters. A rapidly rotating, asymmetric NS in the Milky Way undergoes free
Search for Continuous Gravitational Waves from the Central Compact Objects in Supernova Remnants Cassiopeia A, Vela Jr., and G347.3–0.5
We perform a sub-threshold follow-up search for continuous nearly monochromatic gravitational waves from the central compact objects associated with the supernova remnants (SNRs) Vela Jr., Cassiopeia
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