Atomic alignment alters multiplet line ratios in exoplanet transits, so measuring those ratios can constrain magnetic fields above about 0.001 G; current hot-Jupiter data are suggestive but not conclusive.
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Probing exoplanetary magnetism via atomic alignment effect
Atomic alignment alters multiplet line ratios in exoplanet transits, so measuring those ratios can constrain magnetic fields above about 0.001 G; current hot-Jupiter data are suggestive but not conclusive.