The Metallicity of Stars with Close Companions

@article{Grether2006TheMO,
  title={The Metallicity of Stars with Close Companions},
  author={Daniel Grether and C. Lineweaver},
  journal={The Astrophysical Journal},
  year={2006},
  volume={669},
  pages={1220 - 1234}
}
We examine the relationship between the frequency of close companions (stellar and planetary companions with orbital periods <5 yr) and the metallicity of their Sun-like (~FGK) hosts. We confirm and quantify a ~4 σ positive correlation between host metallicity and planetary companions. We find little or no dependence on spectral type or distance in this correlation. In contrast to the metallicity dependence of planetary companions, stellar companions tend to be more abundant around low… 

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