Under a thermally optimistic 20 MeV core model, nine years of Fermi data on 17 dark pulsars set an axion mass upper limit of 9.6e-3 eV, but realistic cooler cores suppress the signal to undetectability.
Sedrakian, title title Axion cooling of neutron stars
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Constraining Axion Mass through Gamma-ray Observations of Pulsars
Under a thermally optimistic 20 MeV core model, nine years of Fermi data on 17 dark pulsars set an axion mass upper limit of 9.6e-3 eV, but realistic cooler cores suppress the signal to undetectability.