Journal
ASTROPHYSICAL JOURNAL
Volume 859, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aabf89
Keywords
binaries: general; stars: neutron; stars: rotation; X-rays: binaries; X-rays: stars
Categories
Funding
- Netherlands Organization for Scientific Research (NWO) Vidi Fellowship
- ARC [CE170100004]
- STFC [Gravitational Waves, ST/N005422/1] Funding Source: UKRI
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We present a systematic coherent X-ray pulsation search in 11 low mass X-ray binaries (LMXBs). We select a relatively broad variety of LMXBs, including persistent and transient sources, spanning orbital periods between 0.3 and 17 hr. We use about 3.6 Ms of data collected by the Rossi X-Ray Timing Explorer and XMM-Newton and apply a semi-coherent search strategy to look for weak and persistent pulses in a wide spin frequency range. We find no evidence for X-ray pulsations in these systems and consequently set upper limits on the pulsed sinusoidal semi-amplitude below 1.6% for ten outbursting/persistent LMXBs and 6% for a quiescent system; the upper limits are further refined, by searching a narrower parameter space around the outliers, down to 0.14%-0.78% and 2.9%, respectively. These results suggest that weak pulsations might not form in (most) non pulsating LMXBs.
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