Scorpius X-1 (Sco X-1) and X-ray transient (XTE) J1751-305 are Low-Mass X-ray Binaries (LMXBs) that may emit continuous gravitational waves detectable in the band of ground-based interferometric observatories. Neutron stars in LMXBs could reach a torque-balance steady-state equilibrium in which angular momentum addition from infalling matter from the binary companion is balanced by angular momentum loss, conceivably due to gravitational-wave emission. Torque-balance predicts a scale for detectable gravitational-wave strain based on observed X-ray flux. This paper describes a search for Sco X-1 and XTE J1751-305 in LIGO Science Run 6 data using the TwoSpect algorithm, based on searching for orbital modulations in the frequency domain. While no detections are claimed, the most stringent upper limits to date on continuous gravitational-wave emission from Sco X-1 are obtained, spanning gravitational wave frequencies from 40 to 2040 Hz and projected semi-major axes from 0.90 to 1.98 light-seconds. At optimal strain sensitivity, achieved at 165 Hz, the 95confidence level random-polarization upper limit on dimensionless strain \textdollarh\textunderscore0is approximately \textdollar1.8 10ˆ\textbraceleft-24\textbraceright\textdollar. Closest approach to the torque-balance limit, within a factor of 27, is also at 165 Hz. Upper limits are set in particular narrow frequency bands of interest for J1751-305. The TwoSpect method will be used in upcoming searches of Advanced LIGO and Virgo data.
%0 Generic
%1 escidoc:2381825
%A Meadors, Grant David
%A Goetz, Evan
%A Riles, Keith
%A Creighton, Teviet
%A Robinet, Florent
%D 2016
%K test
%T Searches for continuous gravitational waves from Scorpius X-1 and XTE J1751-305 in LIGOsixth science run
%U http://arxiv.org/abs/1610.09391
%X Scorpius X-1 (Sco X-1) and X-ray transient (XTE) J1751-305 are Low-Mass X-ray Binaries (LMXBs) that may emit continuous gravitational waves detectable in the band of ground-based interferometric observatories. Neutron stars in LMXBs could reach a torque-balance steady-state equilibrium in which angular momentum addition from infalling matter from the binary companion is balanced by angular momentum loss, conceivably due to gravitational-wave emission. Torque-balance predicts a scale for detectable gravitational-wave strain based on observed X-ray flux. This paper describes a search for Sco X-1 and XTE J1751-305 in LIGO Science Run 6 data using the TwoSpect algorithm, based on searching for orbital modulations in the frequency domain. While no detections are claimed, the most stringent upper limits to date on continuous gravitational-wave emission from Sco X-1 are obtained, spanning gravitational wave frequencies from 40 to 2040 Hz and projected semi-major axes from 0.90 to 1.98 light-seconds. At optimal strain sensitivity, achieved at 165 Hz, the 95confidence level random-polarization upper limit on dimensionless strain \textdollarh\textunderscore0is approximately \textdollar1.8 10ˆ\textbraceleft-24\textbraceright\textdollar. Closest approach to the torque-balance limit, within a factor of 27, is also at 165 Hz. Upper limits are set in particular narrow frequency bands of interest for J1751-305. The TwoSpect method will be used in upcoming searches of Advanced LIGO and Virgo data.
@misc{escidoc:2381825,
abstract = {{Scorpius X-1 (Sco X-1) and X-ray transient (XTE) J1751-305 are Low-Mass X-ray Binaries (LMXBs) that may emit continuous gravitational waves detectable in the band of ground-based interferometric observatories. Neutron stars in LMXBs could reach a torque-balance steady-state equilibrium in which angular momentum addition from infalling matter from the binary companion is balanced by angular momentum loss, conceivably due to gravitational-wave emission. Torque-balance predicts a scale for detectable gravitational-wave strain based on observed X-ray flux. This paper describes a search for Sco X-1 and XTE J1751-305 in LIGO Science Run 6 data using the TwoSpect algorithm, based on searching for orbital modulations in the frequency domain. While no detections are claimed, the most stringent upper limits to date on continuous gravitational-wave emission from Sco X-1 are obtained, spanning gravitational wave frequencies from 40 to 2040 Hz and projected semi-major axes from 0.90 to 1.98 light-seconds. At optimal strain sensitivity, achieved at 165 Hz, the 95\textpercent confidence level random-polarization upper limit on dimensionless strain \textdollarh\textunderscore0\textdollar is approximately \textdollar1.8 \times 10\textasciicircum\textbraceleft-24\textbraceright\textdollar. Closest approach to the torque-balance limit, within a factor of 27, is also at 165 Hz. Upper limits are set in particular narrow frequency bands of interest for J1751-305. The TwoSpect method will be used in upcoming searches of Advanced LIGO and Virgo data.}},
added-at = {2017-01-12T14:39:59.000+0100},
author = {Meadors, Grant David and Goetz, Evan and Riles, Keith and Creighton, Teviet and Robinet, Florent},
biburl = {https://www.bibsonomy.org/bibtex/2041ae033e6a719c524e916f3f29138d2/taller},
eprint = {1610.09391},
interhash = {6fd5c08e49c7ec7f7576b9d282fa0059},
intrahash = {041ae033e6a719c524e916f3f29138d2},
keywords = {test},
timestamp = {2017-01-12T14:39:59.000+0100},
title = {{Searches for continuous gravitational waves from Scorpius X-1 and XTE J1751-305 in LIGO\textquotesingles sixth science run}},
url = {http://arxiv.org/abs/1610.09391},
year = 2016
}