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Spectral Analysis of Stars on Planet-Search Surveys

Published online by Cambridge University Press:  26 May 2016

Debra Fischer ,
Jeff A. Valenti  and
Geoff Marcy
Debra Fischer
Affiliation:
San Francisco State University, 1600 Holloway, Dept Physics and Astronomy, San Francisco, CA 94132
Jeff A. Valenti
Affiliation:
Space Telescope Science Institute, Baltimore, MD 21218
Geoff Marcy
Affiliation:
University of California, Berkeley, Berkeley, CA 94720

Abstract

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We present spectroscopic analysis of ∼1000 stars on the Lick, Keck and AAT planet search projects. This analysis provides a quantitative, and unbiased correlation between metallicity and the rate of occurrence of detected gas giant planets with orbital periods shorter than three years. As stellar metallicity increases, the occurrence of planets increases. Stars with [Fe/H] that is one third of solar only have gas giants detected ∼ 3% of the time. Stars with solar metallicity have a planet occurrence rate of 5 − 10%. The occurrence of gas giant planets rises to 20% in stars with a metallicity that is three times solar.

At issue is whether the quantitative dependence of planet occurrence on metallicity is primarily an initial condition, or a by-product of accretion of gas-depleted material onto the convective zone of the star. Accretion could be distinguished as the underlying mechanism for enhanced metallicity if: 1) planet-bearing F-type stars with thinner convective envelopes show a higher mean metallicity than planet-bearing G- or K-type stars, or 2) planet-bearing sub-giants with diluted convective zones showed statistically lower metallicity than their main sequence counterparts.

Type
Part 1: Introduction: The Sun, the Stars, and the Planets
Information
Symposium - International Astronomical Union , Volume 219: Stars as Suns : Activity, Evolution and Planets , 2004 , pp. 29 - 40
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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