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Probing protoneutron stars with gamma-ray axionscopes

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arxiv 2405.02395 v2 pith:27YL3LJO submitted 2024-05-03 hep-ph astro-ph.HE

Alessandro Lella , Francesca Calore , Pierluca Carenza , Christopher Eckner , Maurizio Giannotti , Giuseppe Lucente , Alessandro Mirizzi This is my paper
classification hep-phastro-ph.HE
keywords gamma-rayspectrumabundancealpsaxioncasecorecoupled
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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.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Lights, Camera, Axion: Tracing Axions from Supernovae in the Diffuse $\gamma$-ray Sky

    hep-ph 2026-04 unverdicted novelty 7.0 of 10

    Axions produced in supernovae generate a diffuse gamma-ray signal through conversion in magnetic fields, yielding competitive constraints on the axion-photon coupling from COMPTEL, EGRET, and Fermi-LAT data plus forec...

  2. Counting axions with IAXO

    hep-ph 2026-06 unverdicted novelty 5.0 of 10

    Projections for IAXO in two-axion parameter space plus spectral analysis of flavor oscillations show where the experiment can discriminate multi-axion signals from single-axion ones, extending to N-axion cases.

  3. Magnetic Turbulence Boosts Supernova Signals of Axion-Photon Conversion

    hep-ph 2026-05 unverdicted novelty 5.0 of 10

    Turbulent magnetic fields enhance axion-photon conversion signals from supernovae, improving limits on axion-proton and axion-photon couplings by up to two orders of magnitude.

  4. Axion-photon conversion in transient compact stars: Systematics, constraints, and opportunities

    hep-ph 2025-09 unverdicted novelty 5.0 of 10

    Analytical expressions for ALP-photon conversion in transient compact stars yield an updated bound g_aγ < 5×10^{-12} GeV^{-1} for m_a ≲ 10^{-9} eV from SN 1987A, plus sensitivity forecasts for future Galactic SN and N...

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