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Emission Properties of Periodic Fast Radio Bursts from the Motion of Magnetars: Testing Dynamical Models

Li, Dongzi and Zanazzi, J. J. (2021) Emission Properties of Periodic Fast Radio Bursts from the Motion of Magnetars: Testing Dynamical Models. Astrophysical Journal Letters, 909 (2). Art. No. L25. ISSN 2041-8205. doi:10.3847/2041-8213/abeaa4.

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Recent observations of the periodic fast radio burst source 180916.J0158+65 (FRB 180916) find small linear polarization position angle swings during and between bursts, with a burst activity window that becomes both narrower and earlier at higher frequencies. Although the observed chromatic activity window disfavors models of periodicity in FRB 180916 driven solely by the occultation of a neutron star by the optically thick wind from a stellar companion, the connection to theories where periodicity arises from the motion of a bursting magnetar remains unclear. In this Letter, we show how altitude-dependent radio emission from a magnetar, with bursts emitted from regions that are asymmetric with respect to the magnetic dipole axis, can lead to burst activity windows and polarization consistent with the recent observations. In particular, the fact that bursts arrive systematically earlier at higher frequencies disfavors theories where the FRB periodicity arises from forced precession of a magnetar by a companion or fallback disk, but is consistent with theories where periodicity originates from a slowly rotating or freely precessing magnetar. Several observational tests are proposed to verify/differentiate between the remaining theories, and pin down which theory explains the periodicity in FRB 180916.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Li, Dongzi0000-0001-7931-0607
Zanazzi, J. J.0000-0002-9849-5886
Additional Information:© 2021. The American Astronomical Society. Received 2021 January 14; revised 2021 February 24; accepted 2021 March 1; published 2021 March 15. D.Z.L. acknowledges the discussion with Liam Connor and Vikram Ravi. J.Z. was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), [funding reference #CITA 490888-16].
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)CITA 490888-16
Subject Keywords:Compact radiation sources; Radio sources; Neutron stars; Radio bursts; Magnetars
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Compact radiation sources (289); Radio sources (1358); Neutron stars (1108); Radio bursts (1339); Magnetars (992)
Record Number:CaltechAUTHORS:20210407-144128979
Persistent URL:
Official Citation:Dongzi Li and J. J. Zanazzi 2021 ApJL 909 L25
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108647
Deposited By: Tony Diaz
Deposited On:07 Apr 2021 23:25
Last Modified:07 Apr 2021 23:25

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