Updated constraints on axion-like particles from temporal information in supernova SN1987A gamma-ray data
arXiv:2212.09764 · doi:10.1088/1475-7516/2023/03/054
Abstract
We revise gamma-ray limits on axion-like particles (ALPs) emitted from supernova SN1987A based on Solar Maximum Mission data. We improve and simplify the computation of the expected gamma-ray signal from ALP decays, while also extending it to non-instantaneous ALP emission. For the first time we make use of the temporal information in the data to update the associated ALP-photon coupling limits. For ALP decays, our updated likelihood only mildly affects the limit compared to previous works due to the absorption of gamma rays close to SN1987A. However, for ALP conversions in the Galactic magnetic field, temporal information improves the limit on the ALP-photon coupling by a factor of 1.4.
12 + 10 pages, 4 figures. V2 adds more details on our methodology, corresponds to the published article. Associated software code available on Github at https://github.com/sebhoof/snax
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