Binary comb models for FRB 121102

Abstract

The first repeating fast radio burst source, FRB 121102, is observed to emit bursts periodically. We show that FRB 121102 can be interpreted as an interacting neutron star binary system with an orbital period of 159 days. We develop a binary comb model by introducing an eccentricity in the orbit. Besides the original funnel mode of the binary comb model, which was applied to FRB 180916.J0158+65 by Ioka and Zhang 2020, we also identify two new modes of the binary comb model, i.e. the tau-crossing mode and the inverse funnel mode, and apply them to interpret FRB 121102. These new developments expand the applicable parameter space, allowing the companion star to be a massive star, a massive black hole, or a supermassive black hole, with the latter two having larger parameter spaces. These models are also consistent with other observations, such as the persistent bright radio counterpart associated with the source. We also argue that the observed frequency dependence of the active window does not disfavor the binary comb model, in contrast to recent claims, and propose two possible scenarios to interpret the data.

23 pages, 12 figures, 1 table

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Cited by in corpus (14)

• The Physics of Fast Radio Bursts
• Arecibo observations of a burst storm from FRB 20121102A in 2016
• The FRB 20121102A November rain in 2018 observed with the Arecibo Telescope
• Faraday Rotation Measure Variations of Repeating Fast Radio Burst Sources
• Rotation Measure Variations and Reversals of Repeating Fast Radio Bursts in Massive Binary Systems
• High frequency study of FRB 20180916B using the 100-m Effelsberg radio telescope
• The periodic origin of fast radio bursts
• Expanding Fireball in Magnetar Bursts and Fast Radio Bursts
• Formation of periodic FRB in binary systems with eccentricity
• Fast radio bursts at the dawn of the 2020s
• Are there magnetars in high-mass X-ray binaries?
• Radio Nebulæ from Hyper-Accreting X-ray Binaries as Common Envelope Precursors and Persistent Counterparts of Fast Radio Bursts
• Energy and waiting time distributions of FRB 121102 observed by FAST
• Optical Transients from Fast Radio Bursts Heating Companion Stars in Close Binary Systems