# Decay photons from the ALP burst of type-II supernovae

## TL;DR

This paper sets limits on massive axion-like particles from supernova SN 1987A by analyzing potential gamma-ray signals from ALP decay, and discusses future detection prospects from nearby supernovae like Betelgeuse.

## Contribution

It provides new constraints on ALPs with masses 10 keV to 100 MeV based on supernova observations and explores future detection possibilities.

## Key findings

- Limits on ALP-photon coupling from SN 1987A data
- Predicted gamma-ray signatures from ALP decay
- Potential sensitivity improvements for future supernovae

## Abstract

We determine limits from SN 1987A on massive axion-like particles (ALPs) with masses in the 10 keV - 100 MeV range and purely coupled to two photons. ALPs produced in the core collapse escape from the star and decay into photons that can be observed as a delayed and diffuse burst. We discuss the time and angular distribution of such a signal. Looking into the future we also estimate the possible improvements if the red supergiant Betelgeuse explodes in a supernova event.