Axion-photon multimessenger astronomy with giant flares

TL;DR

This paper explores the potential for multimessenger astronomy using giant magnetar flares, focusing on detecting axion-photon conversions and setting sensitivity limits for current experiments.

Contribution

It introduces a realistic parameter space analysis for axion detection via giant flares and rules out axion flares as an explanation for the XENON1T excess.

Findings

Sensitivity limits for axion-photon coupling are established.

Axion flares are incompatible with the XENON1T excess due to signal persistence.

Multimessenger signals from giant flares could provide new detection avenues.

Abstract

We treat prospects for multimessenger astronomy with giant flares (GFs), a rare transient event featured by magnetars that can be as luminous as a hundred of the brightest supernovae ever observed. The beamed photons could correlate with an axion counterpart via resonant conversion in the magnetosphere. In a realistic parameter space, we find that the sensitivity limit to galactic GFs for currently viable experiments is $\mathrm{g}_{\phi \gamma}\!\gtrsim\!\mathrm{several}\!\times\!10^{-13}$ GeV$^{-1}$ \& $\mathrm{g}_{\phi e}\!\gtrsim\!\mathrm{few}\!\times\!10^{-12}$. We rule out the compatibility of axion flares with the recent XENON1T excess only due to the time persistence of the signal.