Induced scattering limits on fast radio bursts from stellar coronae

TL;DR

This paper investigates how induced scattering constrains the origin of fast radio bursts, especially from stellar coronae, suggesting that high plasma densities are incompatible with observed burst powers unless the bursts originate in low-density regions.

Contribution

It provides new constraints on stellar coronae models for fast radio bursts by analyzing induced scattering effects related to plasma density and burst propagation.

Findings

High plasma densities in stellar coronae are incompatible with observed burst powers.

Low-density bubbles could allow burst generation and escape without excessive scattering.

Constraints limit the plausible environments for fast radio burst origins.

Abstract

The origin of fast radio bursts remains a puzzle. Suggestions have been made that they are produced within the Earth atmosphere, in stellar coronae, in other galaxies or at cosmological distances. If they are extraterrestrial, the implied brightness temperature is very high, and therefore, the induced scattering places constraints on possible models. In this paper, constraints are obtained on flares from coronae of nearby stars. It is shown that the radio pulses with the observed power could not be generated if the plasma density within and in the nearest vicinity of the source is as high as it is necessary in order to provide the observed dispersion measure. However, one cannot exclude a possibility that the pulses are generated within a bubble with a very low density and pass through the dense plasma only in the outer corona.