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Probing protoneutron stars with gamma-ray axionscopes
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abstract
Axion-like particles (ALPs) coupled to nucleons can be efficiently produced in the interior of protoneutron stars (PNS) during supernova (SN) explosions. If these ALPs are also coupled to photons they can convert into gamma rays in the Galactic magnetic field. This SN-induced gamma-ray burst can be observable by gamma-ray telescopes like ${\textit Fermi}$-LAT if the SN is in the field of view of the detector. We show that the observable gamma-ray spectrum is sensitive to the production processes in the SN core. In particular, if the nucleon-nucleon bremsstrahlung is the dominant axion production channel, one expects a thermal spectrum with average energy $E_a \simeq 50$ MeV. In this case the gamma-ray spectrum observation allows for the reconstruction of the PNS temperature. In case of a sizable pion abundance in the SN core, one expects a second spectral component peaked at $E_a\simeq 200$ MeV due to axion pionic processes. We demonstrate that, through a dedicated LAT analysis, we can detect the presence of this pionic contribution, showing that the detection of the spectral shape of the gamma-ray signal represents a unique probe of the pion abundance in the PNS.
Forward citations
Cited by 6 Pith papers
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In-flight positron annihilation as a probe of feebly interacting particles
In-flight annihilation of positrons produced by supernova feebly interacting particles gives the strongest astrophysical bounds on their electron couplings for masses of roughly 10-200 MeV, covering ALPs, sterile neut...
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Time-delayed gamma-ray signatures of heavy axions from core-collapse supernovae
No gamma-ray excess from four supernovae in Fermi-LAT data yields the strongest constraints yet on MeV-to-GeV heavy axions coupled to both QED and QCD.
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Axion-induced pair production: a new strategy for axion detection
Axion-induced pair production in a nuclear electric field is the dominant detection channel for axions above roughly 10 MeV and substantially improves projected supernova axion sensitivities.
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Fresh look at the diffuse ALP background from supernovae
Adding pion conversion to the diffuse supernova ALP background tightens the Fermi-LAT bound on the ALP-photon coupling to about 2e-13 GeV^-1 for ultralight ALPs, and SN 1987A remains roughly ten times stronger.
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Lecture Notes: WISPs in gamma-ray astrophysics
The paper is a pedagogical review of axion-like particle searches in gamma-ray astrophysics, with tutorial derivations and a notebook-based analysis of NGC 1275, and it contains no new research result.
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Status and Perspectives on Axion Searches
A concise review of axion and ALP search experiments, their recent limits, and upcoming projects.
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