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J/ApJ/697/544 Planets orbiting metal-poor dwarfs. II. (Sozzetti+, 2009)
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Beginning of ReadMe :J/ApJ/697/544 Planets orbiting metal-poor dwarfs. II. (Sozzetti+, 2009)
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A Keck HIRES Doppler search for planets orbiting metal-poor dwarfs.
II. On the frequency of giant planets in the metal-poor regime.
Sozzetti A., Torres G., Latham D.W., Stefanik R.P., Korzennik S.G.,
Boss A.P., Carney B.W., Laird J.B.
<Astrophys. J., 697, 544-556 (2009)>
=2009ApJ...697..544S
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ADC_Keywords: Stars, metal-deficient ; Radial velocities ; Abundances, [Fe/H] ;
Spectroscopy ; Planets
Keywords: planetary systems: formation - stars: abundances - stars: statistics -
techniques: radial velocities
Abstract:
We present an analysis of three years of precision radial velocity
(RV) measurements of 160 metal-poor stars observed with HIRES on the
Keck 1 telescope. We report on variability and long-term velocity
trends for each star in our sample. We identify several long-term,
low-amplitude RV variables worthy of followup with direct imaging
techniques. We place lower limits on the detectable companion mass as
a function of orbital period. Our survey would have detected, with a
99.5% confidence level, over 95% of all companions on low-eccentricity
orbits with velocity semiamplitude K> 100m/s, or
M_p_sini> 3.0M_J_(P/yr)^(1/3)^, for orbital periods P< 3yr. None of
the stars in our sample exhibits RV variations compatible with the
presence of Jovian planets with periods shorter than the survey
duration.
Description:
Table 1 lists 160 metal-deficient stars observed at least twice during
our three-year long observing campaign with HIRES on the Keck 1
telescope in 2003-2005. About 10% of the targets in Table 1 are also
in the list of southern metal-poor stars observed with HARPS (Mayor
et al. 2003Msngr.114...20M).