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We explore how the Peccei-Quinn (PQ) axion parameter space can be constrainedby the frequency-dependence dimming of radiation from astrophysical objects. Todo so we perform accurate calculations of photon-axion conversion in thepresence of a variable magnetic field. We propose several tests where the PQaxion parameter space can be explored with current and future astronomicalsurveys: the observed spectra of isolated neutron stars, occultations ofbackground objects by white dwarfs and neutron stars, the light curves ofeclipsing binaries containing a white dwarf. We find that the lack of dimmingof the light curve of a detached eclipsing white dwarf binary recentlyobserved, leads to relevant constraints on the photon-axion conversion. Currentsurveys designed for Earth-like planet searches are well matched to strengthenand improve the constraints on the PQ axion using astrophysical objectsradiation dimming.

Peccei-Quinn axions from frequency dependence radiation dimming