Does the accreting millisecond pulsar XTE J1814-338 precess?

Details Does the accreting millisecond pulsar XTE J1814-338 precess? Does the accreting millisecond pulsar XTE J1814-338 precess?

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1068...47c&link_type=abstract

A DECADE OF ACCRETING MILLISECOND X-RAY PULSARS. AIP Conference Proceedings, Volume 1068, pp. 47-50 (2008).

Computer Science

2

Pulsars, Accretion And Accretion Disks, X-Ray Binaries

Scientific paper

Accretion-powered pulsars with slight ellipticites are expected to precess, producing characteristic variations in their pulse properties. We compute light curves for various geometric configurations of a precessing pulsar and predict the periodic modulation of the mean flux, pulse-phase residuals and fractional amplitudes of the pulse profiles. We then search for these signatures in 37 days of X-ray timing data from the accreting millisecond pulsar XTE J1814-338. We analyze a 12.2-d modulation observed previously and show that it is consistent with a freely precessing neutron star only if the inclination angle is <0.1°, an a priori unlikely orientation. If the observed flux variations are due to precession, we infer an upper limit on ɛ of 3.0×10-9 and estimate the tilt angle θ to lie between 5° and 10° despite the inability of our model to match the relative phasing of the observable parameters. This implies a maximum gravitational wave strain of 10-27 from XTE J1814-338 (assuming a distance of 8 kpc). If the observed flux variations are not due to precession, we place an upper limit on the product V cos θ of <=9.9×10-10.

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