English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Scorpius X-1 (Sco X-1) and X-ray transient (XTE) J1751-305 are Low-Mass X-rayBinaries (LMXBs) that may emit continuous gravitational waves detectable in theband of ground-based interferometric observatories. Neutron stars in LMXBscould reach a torque-balance steady-state equilibrium in which angular momentumaddition from infalling matter from the binary companion is balanced by angularmomentum loss, conceivably due to gravitational-wave emission. Torque-balancepredicts a scale for detectable gravitational-wave strain based on observedX-ray flux. This paper describes a search for Sco X-1 and XTE J1751-305 in LIGOScience Run 6 data using the TwoSpect algorithm, based on searching for orbitalmodulations in the frequency domain. While no detections are claimed, upperlimits on continuous gravitational-wave emission from Sco X-1 are obtained,spanning gravitational-wave frequencies from 40 to 2040 Hz and projectedsemi-major axes from 0.90 to 1.98 light-seconds. These upper limits areinjection validated, equal any previous set in initial LIGO data, and extendover a broader parameter range. At optimal strain sensitivity, achieved at 165Hz, the 95% confidence level random-polarization upper limit on dimensionlessstrain $h_0$ is approximately $1.8 \times 10^{-24}$. Closest approach to thetorque-balance limit, within a factor of 27, is also at 165 Hz. These are thefirst upper limits known to date on $r$-mode emission from this XTE source.Upper limits are set in particular narrow frequency bands of interest forJ1751-305. The TwoSpect method will be used in upcoming searches of AdvancedLIGO and Virgo data.

Searches for continuous gravitational waves from Scorpius X-1 and XTE J1751-305 in LIGO's sixth science run