A KECK HIRES Doppler Search for Planets Orbiting Metal-Poor Dwarfs. II. On the Frequency of Short-Period Giant Planets in the Low-Metallicity Regime

Details A KECK HIRES Doppler Search for Planets Orbiting Metal-Poor Dwarfs. II. On the Frequency of Short-Period Giant Planets in the Low-Metallicity Regime A KECK HIRES Doppler Search for Planets Orbiting Metal-Poor Dwarfs. II. On the Frequency of Short-Period Giant Planets in the Low-Metallicity Regime

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20922605s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #226.05; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We present an analysis of four years of high-precision Doppler measurements with Keck HIRES, searching for giant planets within 1 AU of a well-defined sample of field metal-poor dwarfs in the solar neighborhood. We report on variability, periodicity, and long-term radial-velocity trends for each star. We place upper limits on the companion mass as a function of orbital period and eccentricity. We examine the implications of our results for the observed orbital elements and mass distributions of extrasolar planets. Finally, we place meaningful constraints on the frequency of close-in giant planets around metal-deficient ([Fe/H] < -0.5) dwarfs, thereby helping to distinguish between proposed scenarios of gas giant planet formation.

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