Pre-supernova Ultra-light Axion-like Particles
arXiv:2107.12661 · doi:10.1103/PhysRevD.105.023020
Abstract
We calculate the production of ultra-light axion-like particles (ALPs) in a nearby supernova progenitor. Once produced, ALPs escape from the star and a part of them is converted into photons during propagation in the Galactic magnetic field. It is found that the MeV photon flux that reaches Earth may be detectable by gamma ray telescopes for ALPs lighter than ~1 neV when Betelgeuse undergoes oxygen and silicon burning. The dependence of the gamma ray flux on the stellar mass is much smaller than the uncertainty that originates from the Galactic magnetic field. If ALPs are lighter than ~0.1 neV and the supernova progenitor is close enough to the Solar System, the gamma ray flux is insensitive to the distance d because the ALP-photon conversion probability is proportional to d^2. (Non-)detection of gamma rays from a supernova progenitor with next-generation gamma ray telescopes just after pre-supernova neutrino alerts would lead to an independent constraint on ALP parameters as stringent as a SN 1987A limit.
8 pages, 8 figures, 1 table, accepted for publication in PRD
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