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We present the first results of an all-sky search for continuousgravitational waves from unknown spinning neutron stars in binary systems usingLIGO and Virgo data. Using a specially developed analysis program, the TwoSpectalgorithm, the search was carried out on data from the sixth LIGO Science Runand the second and third Virgo Science Runs. The search covers a range offrequencies from 20 Hz to 520 Hz, a range of orbital periods from 2 to ~2,254 hand a frequency- and period-dependent range of frequency modulation depths from0.277 to 100 mHz. This corresponds to a range of projected semi-major axes ofthe orbit from ~0.6e-3 ls to ~6,500 ls assuming the orbit of the binary iscircular. While no plausible candidate gravitational wave events survive thepipeline, upper limits are set on the analyzed data. The most sensitive 95%confidence upper limit obtained on gravitational wave strain is 2.3e-24 at 217Hz, assuming the source waves are circularly polarized. Although this searchhas been optimized for circular binary orbits, the upper limits obtained remainvalid for orbital eccentricities as large as 0.9. In addition, upper limits areplaced on continuous gravitational wave emission from the low-mass x-ray binaryScorpius X-1 between 20 Hz and 57.25 Hz.

First all-sky search for continuous gravitational waves from unknown sources in binary systems