Recent observations show a clear correlation between the probability of hosting a planet and the metallicity of the parent star. Since radial velocity surveys are biased, however, towards detecting planets with short orbital periods, the probability-metallicity correlation could merely reflect a dependence of migration rates on metallicity. We investigated the possibility, but find no basis to suggest that the migration process is sensitive to the metallicity. The indication is, therefore, that a higher metallicity results in a higher probability for planet formation.
@article{arxiv.astro-ph/0310695,
title = {Metallicity, planetary formation and migration},
author = {M. Livio and J. E. Pringle},
journal= {arXiv preprint arXiv:astro-ph/0310695},
year = {2009}
}