FAST observations of an extremely active episode of FRB 20201124A: IV. Spin Period Search

Abstract

We report the properties of more than 800 bursts detected from the repeating fast radio burst (FRB) source FRB 20201124A with the Five-hundred-meter Aperture Spherical radio telescope (FAST) during an extremely active episode on UTC September 25th-28th, 2021 in a series of four papers. In this fourth paper of the series, we present a systematic search of the spin period and linear acceleration of the source object from both 996 individual pulse peaks and the dedispersed time series. No credible spin period was found from this data set. We rule out the presence of significant periodicity in the range between 1 ms to 100 s with a pulse duty cycle $<0.49\pm 0.08$ (when the profile is defined by a von-Mises function, not a boxcar function) and linear acceleration up to $300$ m s${}^{-2}$ in each of the four one-hour observing sessions, and up to $0.6$ m s${}^{-2}$ in all 4 days. These searches contest theoretical scenarios involving a 1 ms to 100 s isolated magnetar/pulsar with surface magnetic field $<10^{15}$ G and a small duty cycle (such as in a polar-cap emission mode) or a pulsar with a companion star or black hole up to 100 M${}_{\odot }$ and $P_b>10$ hours. We also perform a periodicity search of the fine structures and identify 53 unrelated millisecond-timescale "periods" in multi-components with the highest significance of 3.9 $\sigma$. The "periods" recovered from the fine structures are neither consistent nor harmonically related. Thus they are not likely to come from a spin period. We caution against claiming spin periodicity with significance below $\sim$ 4 $\sigma$ with multi-components from one-off FRBs. We discuss the implications of our results and the possible connections between FRB multi-components and pulsar micro-structures.

Accepted by Research in Astronomy and Astrophysics (RAA)

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• FAST observations of an extremely active episode of FRB 20201124A: III. Polarimetry
• Polarization of Fast Radio Bursts: radiation mechanisms and propagation effects
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• A fast radio burst with sub-millisecond quasi-periodic structure
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• A Thorough Search for Short Timescale Periodicity in Four Active Repeating Fast Radio Bursts
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• The FAST Galactic Plane Pulsar Snapshot survey: IV. Discovery of five fast radio bursts
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• Low-frequency, wideband study of an active repeater, FRB 20240114A, with the GMRT
• An activity transition in FRB 20201124A: methodological rigor, detection of frequency-dependent cessation, and a geometric magnetar model
• A comprehensive search for Long and Short Periodic Features from an Extremely Active Cycle of FRB 20240114A
• A Practical Framework for Estimating the Repetition Likelihood of Fast Radio Bursts from Spectral Morphology
• Estimation of neutron star mass and radius of FRB 20240114A by identification of crustal oscillations
• Fast radio bursts, magnetars and earthquakes: their "family feud"?
• Detecting FRB by DANCE: a method based on DEnsity ANalysis and Cluster Extraction