Jul 18 – 22, 2022
Europe/Zurich timezone

Hunting for axions in the solar basin

Jul 21, 2022, 2:00 PM


Oral presentation Parallel 3B - Axions


William DeRocco


A large flux of axion-like particles can be produced in the solar core. While the majority of these particles will have high velocities and escape the Sun’s gravitational pull, a small fraction of low-velocity particles will become trapped on bound orbits. Over time, an appreciable density of slow-moving axions can accumulate in this “solar basin.” Their subsequent decay to two photons provides a distinct observational signature. I will present a recent analysis using data taken by the NuSTAR X-ray telescope to search for the decay products of keV-scale axions trapped in the solar basin. Our results ultimately set limits on the axion-photon and axion-electron couplings well over an order of magnitude beyond current constraints and motivate the further exploration of stellar basins in other astrophysical systems.

Primary author

William DeRocco


Dr Brian Grefenstette Dr Ken Van Tilburg Dr Junwu Huang Shalma Wegsman

Presentation materials