A systematic Z1^2 and maximum-likelihood search of RXTE data finds dozens of intermittent pulse candidates in three accreting millisecond pulsars and derives an 8.76 h orbital period for SAX J1748.9-2021.
Discovery of the Millisecond X-Ray Pulsar HETE J1900.1-2455
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abstract
We report the discovery of millisecond pulsations from the low-mass X-ray binary HETE J1900.1-2455 which was discovered by the detection of a type I X-ray burst by the High Energy Transient Explorer 2 (HETE-2). The neutron star emits coherent pulsations at 377.3 Hz and is in an 83.3 minute circular orbit with a companion with a mass greater than 0.016 solar masses and likely less than 0.07 solar masses. The companion star's Roche lobe could be filled by a brown dwarf with no need for heating or non-standard evolution. During one interval with an unusually high X-ray flux, the source produced quasiperiodic oscillations with a single peak at 883 Hz and on subsequent days, the pulsations were suppressed. We consider the distribution of spin versus orbital period in neutron star low-mass X-ray binaries.
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An Elaborate Search for Coherent Pulsations from Intermittent-AMXPs
A systematic Z1^2 and maximum-likelihood search of RXTE data finds dozens of intermittent pulse candidates in three accreting millisecond pulsars and derives an 8.76 h orbital period for SAX J1748.9-2021.