Stellar parameters and metallicities of stars hosting Jovian and Neptunian mass planets: A possible dependence of planetary mass on metallicity

L. Ghezzi, K. Cunha, V. V. Smith, F. X. De Araújo, S. C. Schuler, R. De La Reza

Research output: Contribution to journalArticlepeer-review

117 Scopus citations

Abstract

The metal content of planet-hosting stars is an important ingredient that may affect the formation and evolution of planetary systems. Accurate stellar abundances require the determinations of reliable physical parameters, namely, the effective temperature, surface gravity, microturbulent velocity, and metallicity. This work presents the homogeneous derivation of such parameters for a large sample of stars hosting planets (N = 117), as well as a control sample of disk stars not known to harbor giant, closely orbiting planets (N = 145). Stellar parameters and iron abundances are derived from an automated analysis technique developed for this work. As previously found in the literature, the results in this study indicate that the metallicity distribution of planet-hosting stars is more metal rich by ∼0.15 dex when compared to the control sample stars. A segregation of the sample according to planet mass indicates that the metallicity distribution of stars hosting only Neptunian-mass planets (with no Jovian-mass planets) tends to be more metal poor in comparison with that obtained for stars hosting a closely orbiting Jovian planet. The significance of this difference in metallicity arises from a homogeneous analysis of samples of FGK dwarfs which do not include the cooler and more problematic M dwarfs. This result would indicate that there is a possible link between planet mass and metallicity such that metallicity plays a role in setting the mass of the most massive planet. Further confirmation, however, must await larger samples.

Original languageEnglish (US)
Pages (from-to)1290-1302
Number of pages13
JournalAstrophysical Journal
Volume720
Issue number2
DOIs
StatePublished - Sep 10 2010
Externally publishedYes

Keywords

  • Planetary systems
  • Planets and satellites: formation
  • Stars: abundances
  • Stars: atmospheres
  • Stars: fundamental parameters

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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