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Periodic activity from a fast radio burst source

2020; Nature Portfolio; Volume: 582; Issue: 7812 Linguagem: Inglês

10.1038/s41586-020-2398-2

1476-4687

M. Amiri, Bridget C. Andersen, Kevin Bandura, Mohit Bhardwaj, P. J. Boyle, Charanjot Brar, Pragya Chawla, Tianyue Chen, J.-F. Cliche, Davor Čubranić, Meiling Deng, Nolan Denman, M. Dobbs, Fengqiu Adam Dong, Mateus Fandino, Emmanuel Fonseca, B. M. Gaensler, Utkarsh Giri, Deborah C. Good, M. Halpern, J. W. T. Hessels, Alex S. Hill, C. Höfer, Alexander Josephy, Joseph Kania, R. Karuppusamy, V. M. Kaspi, A. Keimpema, Franz Kirsten, T. L. Landecker, Dustin Lang, Calvin Leung, Dongzi Li, Hsiu-Hsien Lin, B. Marcote, Kiyoshi W. Masui, Ryan Mckinven, Juan Mena-Parra, Marcus Merryfield, Daniele Michilli, Nikola Milutinović, Arash Mirhosseini, Arun Naidu, Laura Newburgh, Cherry Ng, Kenzie Nimmo, Z. Paragi, C. Patel, Ue‐Li Pen, Tristan Pinsonneault-Marotte, Ziggy Pleunis, Masoud Rafiei-Ravandi, Mubdi Rahman, S. M. Ransom, Andre Renard, Pranav Sanghavi, Paul Scholz, J. Richard Shaw, Kaitlyn Shin, Seth R. Siegel, Saurabh Singh, R. J. Smegal, Kendrick M. Smith, I. H. Stairs, Shriharsh P. Tendulkar, Ian Tretyakov, K. Vanderlinde, Haochen Wang, X. Wang, Dallas Wulf, P. Yadav, A. V. Zwaniga,

Astrophysical Phenomena and Observations

Fast radio bursts (FRBs) are bright, millisecond-duration radio transients originating from sources at extragalactic distances1, the origin of which is unknown. Some FRB sources emit repeat bursts, ruling out cataclysmic origins for those events2-4. Despite searches for periodicity in repeat burst arrival times on timescales from milliseconds to many days2,5-7, these bursts have hitherto been observed to appear sporadically and-although clustered8-without a regular pattern. Here we report observations of a 16.35 ± 0.15 day periodicity (or possibly a higher-frequency alias of that periodicity) from the repeating FRB 180916.J0158+65 detected by the Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst Project4,9. In 38 bursts recorded from 16 September 2018 to 4 February 2020 UTC, we find that all bursts arrive in a five-day phase window, and 50 per cent of the bursts arrive in a 0.6-day phase window. Our results suggest a mechanism for periodic modulation either of the burst emission itself or through external amplification or absorption, and disfavour models invoking purely sporadic processes.