I always understood that Population II stars were unlikely to have planets as they were virtually all H and He with very little else.
Have recent observations confirmed this, or have planets been discovered around Population II stars?
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Kapteyn's star has 14% the metallicity of the Sun and is about 11 billion years old and is in the galactic halo. It has two reported planets.
I don't know if 14% is low enough to count as Population II, but according to the NASA exoplanet archive it is the lowest metallicity star known to have planets.