Higher metallicities might support the formation of large cores, explaining why we're more likely to find a gas giant orbiting a metal-rich star
So far, of the 750 confirmed exoplanet discoveries, there is a better statistical likelihood of a metal-rich star
playing host to planets.
It has long been noted that giant planets with short orbital periods tend to be associated with metal-rich stars
Astronomers have found most extrasolar planets orbiting younger, relatively metal-rich stars