J/ApJ/906/L14ivo://CDS.VizieR/J/ApJ/906/L14doi:10.26093/cds/vizier.19069014CDSZhang Y.Papa M.A.Krishnan B.Watts A.L.2022-06-13T09:56:08Z2022-06-03T06:39:01ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frneutron-starsx-ray-binary-starsgravitational-wavesmillimeter-astronomyphotometrysubmillimeter-astronomyWe present the results of a search in LIGO O2 public data for continuous gravitational waves from the neutron star in the low-mass X-ray binary Scorpius X-1. We search for signals with ~constant frequency in the range 40-180Hz. Thanks to the efficiency of our search pipeline we can use a long coherence time and achieve unprecedented sensitivity, significantly improving on existing results. This is the first search that has been able to probe gravitational wave amplitudes that could balance the accretion torque at the neutron star radius. Our search excludes emission at this level between 67.5 and 131.5Hz, for an inclination angle 44{deg}{+/-}6{deg} derived from radio observations, and assuming that the spin axis is perpendicular to the orbital plane. If the torque arm is ~26km-a conservative estimate of the Alfven radius-our results are more constraining than the indirect limit across the band. This allows us to exclude certain mass-radius combinations and to place upper limits on the strength of the star's magnetic field with a different probe than ever used before. We also correct a mistake that appears in the literature in the equation that gives the gravitational wave amplitude at the torque balance and we re-interpret the associated latest LIGO/Virgo results in light of this.2021ApJ...906L..14Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/906/L14CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/839/12 : Gravitational waves search from PSR with LIGO (Abbott+, 2017)J/ApJ/879/10 : 2015-2017 LIGO obs. analysis for 221 pulsars (Abbott+, 2019)J/ApJ/902/L46 : Gravitational-wave freq. limits PSRJ1653-0158 (Nieder+, 2020)http://www.gw-openscience.org/O2/ : Gravitational Wave Open Science Centerhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/906/L14https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/906/L14http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/906/L14https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/906/L14https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/906/L14http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/906/L14GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapMillimeterdefaultJ/ApJ/906/L14/fig195% confidence upper limits on the intrinsic gravitational wave amplitude in half-Hz bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreq[40/180] Gravitation wave frequencyHzem.freqfloatAmp[7.06e-26/8.56e-25] Gravitation wave amplitude upper limit (1)src.var.amplitude;stat.maxdoubleAmpM[1.23e-25/1.49e-24] Marginalized gravitation wave amplitude upper limit (2)src.var.amplitude;stat.maxdouble