Upper Limits on Gravitational Waves from Scorpius X-1 from a Model-based Cross-correlation Search in Advanced LIGO Data
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...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
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IOP Publishing
2018
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| Online Access: | http://hdl.handle.net/1721.1/114960 https://orcid.org/0000-0002-0026-3877 https://orcid.org/0000-0002-9635-7527 https://orcid.org/0000-0001-9409-5757 https://orcid.org/0000-0002-3503-2032 https://orcid.org/0000-0001-8196-9267 https://orcid.org/0000-0001-8459-4499 https://orcid.org/0000-0003-1983-3187 https://orcid.org/0000-0001-6550-3045 https://orcid.org/0000-0002-1347-0680 https://orcid.org/0000-0003-2047-3166 https://orcid.org/0000-0002-5163-683X https://orcid.org/0000-0003-0219-9706 https://orcid.org/0000-0003-2815-7387 https://orcid.org/0000-0002-4147-2560 https://orcid.org/0000-0003-1510-4921 |
| Summary: | 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 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 Hz, with comparable limits set across the most sensitive frequency range from 100 to 200 Hz. At this frequency, the 95% upper limit on the signal amplitude h 0 is 2.3 × 10 -25 marginalized over the unknown inclination angle of the neutron star's spin, and 8.0 × 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 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. |
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