A KECK HIRES DOPPLER SEARCH FOR PLANETS ORBITING METAL-POOR DWARFS. II. ON THE FREQUENCY OF GIANT PLANETS IN THE METAL-POOR REGIME
| Autor: | Robert P. Stefanik, John B. Laird, Guillermo Torres, David W. Latham, Sylvain G. Korzennik, Bruce W. Carney, Alan P. Boss, Alessandro Sozzetti |
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| Rok vydání: | 2009 |
| Předmět: |
Earth and Planetary Astrophysics (astro-ph.EP)
Physics 010308 nuclear & particles physics Gas giant Metallicity Giant planet FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Orbital period 01 natural sciences Radial velocity Jupiter Stars 13. Climate action Space and Planetary Science Planet 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | The Astrophysical Journal. 697:544-556 |
| ISSN: | 1538-4357 0004-637X |
| Popis: | We present an analysis of three years of precision radial velocity 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 radial-velocity variables worthy of follow-up 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 semi-amplitude K > 100 m/s, or M_p*sin(i) > 3.0 M_JUP*(P/yr)^(1/3), for orbital periods P< 3 yr. None of the stars in our sample exhibits radial-velocity variations compatible with the presence of Jovian planets with periods shorter than the survey duration. The resulting average frequency of gas giants orbiting metal-poor dwarfs with -2.0 < [Fe/H] < -0.6 is f_p 59 pages, 7 tables, 8 figures. Accepted for publication in the Astrophysical Journal |
| Databáze: | OpenAIRE |
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