Correlations Between Stellar Metallicity and the Frequency of Planetary and Stellar Companions

Details Correlations Between Stellar Metallicity and the Frequency of Planetary and Stellar Companions Correlations Between Stellar Metallicity and the Frequency of Planetary and Stellar Companions

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20919608l&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #196.08; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We analyze the relationship between the frequency of close companions (stellar and planetary companions with orbital periods < 5 years) and the metallicity of their Sun-like ( FGK) hosts. We confirm and quantify a positive correlation between host metallicity and the presence of an exoplanetary companion. We find little or no host-mass-dependence or distance-dependence in this correlation. In contrast to the metallicity dependence of planetary companions, stellar companions tend to be more abundant around low metallicity hosts. We find an anti-correlation between host metallicity and the presence of a stellar companion. We investigate possible selection effects that could explain the preferential detection of stellar binarity in low metallicity hosts, including spectral type, distance and kinematic selection. Upon dividing our sample into FG and K sub-samples, we find a strong anti-correlation in the K sub-sample and a negligible correlation in the FG sub-sample. We were unable to identify any strong selection effects that could explain this anti-correlation.

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