Results from high-frequency all-sky search for continuous gravitational waves from small-ellipticity sources

We present the results of an all-sky search for continuous gravitational wave signals with frequencies in the 1700-2000 Hz range from neutron stars with ellipticity of 1e-8. The search employs the Falcon analysis pipeline on LIGO O2 public data. Our results improve by a factor greater than 5 over [citation 5]. Within the probed frequency range and aside from the detected outliers, we can exclude neutron stars with ellipticity of 1e-8 within 65 pc of Earth. We set upper limits on the gravitational wave amplitude that hold even for worst-case signal parameters. New outliers are found, some of which we are unable to associate with any instrumental cause. If any were associated with a rotating neutron star, this would likely be the fastest neutron star today.

[1]  D. Jones,et al.  Modelling neutron star mountains , 2020, Monthly Notices of the Royal Astronomical Society.

[2]  B. Machenschalk,et al.  Einstein@Home All-sky Search for Continuous Gravitational Waves in LIGO O2 Public Data , 2020, The Astrophysical Journal.

[3]  M. Papa,et al.  Results from the First All-Sky Search for Continuous Gravitational Waves from Small-Ellipticity Sources. , 2020, Physical review letters.

[4]  Sylvia J. Zhu,et al.  Characterizing the continuous gravitational-wave signal from boson clouds around Galactic isolated black holes , 2020, 2003.03359.

[5]  Andrew L. Miller,et al.  Direct Constraints on the Ultralight Boson Mass from Searches of Continuous Gravitational Waves. , 2019, Physical review letters.

[6]  P. Ricker,et al.  All-sky search for continuous gravitational waves from isolated neutron stars using Advanced LIGO O2 data , 2019, 1903.01901.

[7]  B. A. Boom,et al.  Sensitivity Improvements in the Search for Periodic Gravitational Waves Using O1 LIGO Data. , 2019, Physical review letters.

[8]  P. Lasky,et al.  Evidence for a Minimum Ellipticity in Millisecond Pulsars , 2018, The Astrophysical Journal.

[9]  M. Bejger,et al.  Fundamental physics and the absence of sub-millisecond pulsars , 2018, Astronomy & Astrophysics.

[10]  J. R. Palamos,et al.  Identification and mitigation of narrow spectral artifacts that degrade searches for persistent gravitational waves in the first two observing runs of Advanced LIGO , 2018, 1801.07204.

[11]  R. Lasenby,et al.  Black hole superradiance signatures of ultralight vectors , 2017, 1704.05081.

[12]  S. Dimopoulos,et al.  Black Hole Mergers and the QCD Axion at Advanced LIGO , 2016, 1604.03958.

[13]  A. Arvanitaki,et al.  Discovering the QCD Axion with Black Holes and Gravitational Waves , 2014, 1411.2263.

[14]  V. Dergachev.  Loosely coherent searches for sets of well-modeled signals , 2011, 1110.3297.

[15]  V. Dergachev.  On blind searches for noise dominated signals: a loosely coherent approach , 2010, 1003.2178.

[16]  Piotr Jaranowski,et al.  Data analysis of gravitational-wave signals from spinning neutron stars. V. A narrow-band all-sky search , 2010, 1003.0844.

[17]  B. Schutz,et al.  Data analysis of gravitational-wave signals from spinning neutron stars. I. The signal and its detection , 1998, gr-qc/9804014.