A search for periodic gravitational waves from three recycled pulsars using the AURIGA detector. An implementation of a modified version of the unified approach method

Details A search for periodic gravitational waves from three recycled pulsars using the AURIGA detector. An implementation of a modified version of the unified approach method A search for periodic gravitational waves from three recycled pulsars using the AURIGA detector. An implementation of a modified version of the unified approach method

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...504..673m&link_type=abstract

Astronomy and Astrophysics, Volume 504, Issue 2, 2009, pp.673-679

Astronomy and Astrophysics

Astrophysics

Gravitational Waves, Pulsars: General, Methods: Data Analysis, Methods: Statistical, Techniques: Radial Velocities

Scientific paper

Aims: We report on a search for continuous gravitational wave emission from three recycled radio pulsars, performed by using the data of the resonant detector AURIGA. Given the spin rate of the selected targets - the isolated pulsar PSR J1939+2134 and the binary pulsars PSR J0024-7204J and PSR J0218+4232 - the expected frequency of the emitted gravitational waves falls in the high sensitivity range of the detector. Methods: The main topic is the method, meaning that the statistical analysis is performed by implementing a slightly modified version of the Feldman and Cousins Unified Approach. Results: By using ephemerides provided by suitable radio observations of the targets, we were able to demodulate the Doppler shifts within a coherence time of 1 day, and then incoherently sum 10 daily spectra collected from December 8th to December 17th, 2006. We have found upper limits on the gravitational wave amplitudes in the order of a few units of 10-23 at 90% Confidence Level (C.L.), which translate to limits in the ellipticity of the targeted pulsars of ɛ < 10-4 at 90% C.L. Conclusions: The same framework can then be applied to data coming from most sensitive experiments as VIRGO or LIGO; moreover, an application to recently discovered transients in X-ray pulsars is discussed.

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