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arxiv: 2107.08463 · v2 · pith:3OLNDQ37new · submitted 2021-07-18 · 🌌 astro-ph.HE

Sub-second periodicity in a fast radio burst

The CHIME/FRB Collaboration , Bridget C. Andersen , Kevin Bandura , Mohit Bhardwaj , P. J. Boyle , Charanjot Brar , Daniela Breitman , Tomas Cassanelli
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Shami Chatterjee Pragya Chawla Jean-Fran\c{c}ois Cliche Davor Cubranic Alice P. Curtin Meiling Deng Matt Dobbs Fengqiu Adam Dong Emmanuel Fonseca B. M. Gaensler Utkarsh Giri Deborah C. Good Alex S. Hill Alexander Josephy J. F. Kaczmarek Zarif Kader Joseph Kania Victoria M. Kaspi Calvin Leung D. Z. Li Hsiu-Hsien Lin Kiyoshi W. Masui Ryan Mckinven Juan Mena-Parra Marcus Merryfield B. W. Meyers D. Michilli Arun Naidu Laura Newburgh C. Ng Anna Ordog Chitrang Patel Aaron B. Pearlman Ue-Li Pen Emily Petroff Ziggy Pleunis Masoud Rafiei-Ravandi Mubdi Rahman Scott Ransom Andre Renard Pranav Sanghavi Paul Scholz J. Richard Shaw Kaitlyn Shin Seth R. Siegel Saurabh Singh Kendrick Smith Ingrid Stairs Chia Min Tan Shriharsh P. Tendulkar Keith Vanderlinde D. V. Wiebe Dallas Wulf Andrew Zwaniga
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classification 🌌 astro-ph.HE
keywords emissionradiocomponentsdetectionfastneutron-starperiodicityarising
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Fast radio bursts (FRBs) are millisecond-duration flashes of radio waves that are visible at distances of billions of light-years. The nature of their progenitors and their emission mechanism remain open astrophysical questions. Here we report the detection of the multi-component FRB 20191221A and the identification of a periodic separation of 216.8(1) ms between its components with a significance of 6.5 sigmas. The long (~3 s) duration and nine or more components forming the pulse profile make this source an outlier in the FRB population. Such short periodicity provides strong evidence for a neutron-star origin of the event. Moreover, our detection favours emission arising from the neutron-star magnetosphere, as opposed to emission regions located further away from the star, as predicted by some models.

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