English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The six known highly dispersed fast radio bursts are attributed toextragalactic radio sources, of unknown origin but extremely energetic. Wepropose here a new explanation - not requiring an extreme release of energy -involving a body (planet, asteroid, white dwarf) orbiting an extragalacticpulsar. We investigate a theory of radio waves associated to suchpulsar-orbiting bodies. We focus our analysis on the waves emitted from themagnetic wake of the body in the pulsar wind. After deriving their properties,we compare them with the observations of various transient radio signals inorder to see if they could originate from pulsar-orbiting bodies. The analysisis based on the theory of Alfv\'en wings: for a body immersed in a pulsar wind,a system of two stationary Alfv\'en waves is attached to the body, providedthat the wind is highly magnetized. When destabilized through plasmainstabilities, Alfv\'en wings can be the locus of strong radio sourcesconvected with the pulsar wind. Assuming a cyclotron maser instabilityoperating in the Alfv\'en wings, we make predictions about the shape,frequencies and brightness of the resulting radio emissions. Because of thebeaming by relativistic aberration, the signal is seen only when the companionis perfectly aligned between its parent pulsar and the observer, as foroccultations. For pulsar winds with a high Lorentz factor, the whole durationof the radio event does not exceed a few seconds, and it is composed of one tofour peaks lasting a few milliseconds each, detectable up to distances ofseveral Mpc. The Lorimer burst, the three isolated pulses of PSR J1928+15, andthe recently detected fast radio bursts are all compatible with our model.According to it, these transient signals should repeat periodically with thecompanion's orbital period. The search of pulsar-orbiting bodies could be anexploration theme for new- or next-generation radio telescopes.

Radio emissions from pulsar companions : a refutable explanation for galactic transients and fast radio bursts