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Related Experiment Video

Updated: May 13, 2026

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Constraining the axion-photon coupling with massive stars.

Alexander Friedland¹, Maurizio Giannotti, Michael Wise

¹Theoretical Division, T-2, MS B285, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. friedland@lanl.gov

Physical Review Letters

|February 26, 2013

Summary

Stars between 8-12 solar masses can probe axion-photon interactions. Axion energy losses would shorten blue loops, contradicting observations. This study sets new limits on axion-photon coupling.

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Last Updated: May 13, 2026

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Published on: March 30, 2017

Area of Science:

Astrophysics
Particle Physics

Background:

Stars in the ~8-12 solar mass range are crucial for understanding stellar evolution.
The blue loop phase in stellar evolution is essential for explaining observed stellar populations, such as Cepheid stars.

Purpose of the Study:

To investigate the potential of intermediate-mass stars as sensitive probes of the axion-photon interaction.
To constrain the coupling constant g(Aγγ) by analyzing the impact of axion energy losses on stellar evolution.

Main Methods:

Utilized the MESA stellar evolution code.
Modified MESA to incorporate additional energy loss mechanisms due to axion emission.
Simulated stellar evolution for stars in the 8-12 solar mass range with axion cooling.

Main Results:

Axion energy losses from the helium-burning core significantly shorten or eliminate the blue loop phase.
This predicted shortening contradicts observational data requiring the existence of blue loops.

Conclusions:

The study provides a conservative upper limit on the axion-photon interaction strength: g(Aγγ) < 0.8 x 10^-10 GeV^-1.
This result offers a competitive constraint compared to existing bounds, highlighting the utility of these stars as axion probes.