We find that the polarimetric observations of protoplanetary disks are useful to search for ultralight axion dark matter. Axion dark matter predicts the rotation of the linear polarization plane of propagating light, and protoplanetary disks are ideal targets to observe it. We show that a recent observation puts the tightest constraint on the axion-photon coupling constant for an axion mass m ≲10-21 eV .
Physical Review Letters
- Pub Date:
- May 2019
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- Astrophysics - Earth and Planetary Astrophysics;
- High Energy Physics - Phenomenology
- 5 pages, 3 figures, Updated to match the version accepted by PRL