Kavli Affiliate: Kejia Lee
| First 5 Authors: Jiangwei Xu, Heng Xu, Yanjun Guo, Jinchen Jiang, Bojun Wang
| Summary:
Fast radio bursts (FRBs) are luminous, dispersed millisecond-duration radio
bursts whose origin is poorly known. Recent observations suggest that some FRBs
may reside in binary systems, even though conclusive evidence remains elusive.
Here we report the detection of a 26.24$pm$0.02 day periodicity in Faraday
rotation measure (RM) of an actively repeating source named FRB 20201124A. The
detection was made from 3,106 bursts collected with the Five-hundred-meter
Aperture Spherical radio Telescope (FAST) over ~365 days. The RM periodicity is
coherently phase-connected across ~14 cycles over a 1-year duration. Our
detection of RM periodicity corresponds to a natural logarithmic Bayesian
factor of 1,168. The detection significances vary between 5.9-34 {sigma} under
different assumptions. Such a periodicity provides evidence for the binary
nature of FRB 20201124A, where the periodic RM variations arise from the
orbital motion of the FRB source within the magnetoionic environment of the
system. Together with previous observations, our result suggests that being in
binary systems may be a common feature for actively repeating FRB sources.
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