Upper limits on gravitational waves from scorpius X-1 from a model-based cross-correlation search in Advanced LIGO data

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dc.contributor.author Sengupta, Anand
dc.date.accessioned 2019-06-19T11:12:57Z
dc.date.available 2019-06-19T11:12:57Z
dc.date.issued 2017-09
dc.identifier.citation Sengupta, Anand et al., "Upper limits on gravitational waves from scorpius X-1 from a model-based cross-correlation search in Advanced LIGO data", The Astrophysical Journal, DOI: 10.3847/1538-4357/aa86f0, vol. 847, no. 1, Sep. 2017. en_US
dc.identifier.issn 1538-4357
dc.identifier.uri https://doi.org/10.3847/1538-4357/aa86f0
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/4550
dc.description.abstract We present the results of a semicoherent search for continuous gravitational waves from the low-mass X-ray binary Scorpius X-1, using data from the first Advanced LIGO observing run. The search method uses details of the modeled, parametrized continuous signal to combine coherently data separated by less than a specified coherence time, which can be adjusted to trade off sensitivity against computational cost. A search was conducted over the frequency range 25�$2000\,\mathrm{Hz}$, spanning the current observationally constrained range of binary orbital parameters. No significant detection candidates were found, and frequency-dependent upper limits were set using a combination of sensitivity estimates and simulated signal injections. The most stringent upper limit was set at $175\,\mathrm{Hz}$, with comparable limits set across the most sensitive frequency range from 100 to $200\,\mathrm{Hz}$. At this frequency, the 95% upper limit on the signal amplitude h 0 is $2.3\times {10}^{-25}$ marginalized over the unknown inclination angle of the neutron star's spin, and $8.0\times {10}^{-26}$ assuming the best orientation (which results in circularly polarized gravitational waves). These limits are a factor of 3�4 stronger than those set by other analyses of the same data, and a factor of ~7 stronger than the best upper limits set using data from Initial LIGO science runs. In the vicinity of $100\,\mathrm{Hz}$, the limits are a factor of between 1.2 and 3.5 above the predictions of the torque balance model, depending on the inclination angle; if the most likely inclination angle of 44� is assumed, they are within a factor of 1.7.
dc.description.statementofresponsibility by Anand Sengupta et al.
dc.format.extent vol. 847, no. 1
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject accretion, accretion disks en_US
dc.subject gravitational waves en_US
dc.subject stars: neutron|X-rays: binaries en_US
dc.title Upper limits on gravitational waves from scorpius X-1 from a model-based cross-correlation search in Advanced LIGO data en_US
dc.type Article en_US
dc.relation.journal The Astrophysical Journal


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