Elodie metallicity-biased search for transiting Hot Jupiters I. Two Hot Jupiters orbiting the slightly evolved stars HD 118203 and HD 149143

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作者
Da Silva, R. [1 ]
Udry, S. [1 ]
Bouchy, F. [2 ]
Mayor, M. [1 ]
Moutou, C. [2 ]
Pont, F. [1 ]
Queloz, D. [1 ]
Santos, N.C. [1 ,3 ]
Ségransan, D. [1 ]
Zucker, S. [1 ,4 ]
机构
[1] Geneva Observatory, 1290 Sauverny, Switzerland
[2] Observatoire de Marseille, France
[3] Centro de Astronomia e Astrofísica, Universidade de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal
[4] Weizmann Institute of Science, PO Box 26, Rehovot 76100, Israel
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Astronomy and Astrophysics | 1600年 / 446卷 / 02期
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We report the discovery of a new planet candidate orbiting the subgiant star HD 118203 with a period of P = 6.1335 days. The best Keplerian solution yields an eccentricity e = 0.31 and a minimum mass m2 sin i = 2.1 MJup for the planet. This star has been observed with the ELODIE fiber-fed spectrograph as one of the targets in our planet-search programme biased toward high-metallicity stars; on-going since March 2004 at the Haute-Provence Observatory. An analysis of the spectroscopic line profiles using line bisectors revealed no correlation between the radial velocities and the line-bisector orientations; indicating that the periodic radial-velocity signal is best explained by the presence of a planet-mass companion. A linear trend is observed in the residuals around the orbital solution that could be explained by the presence of a second companion in a longer-period orbit. We also present here our orbital solution for another slightly evolved star in our metal-rich sample; HD; 149143; recently proposed to host a 4-d period Hot Jupiter by the N2K consortium. Our solution yields a period P = 4.09 days; a marginally significant eccentricity e = 0.08 and a planetary minimum mass of 1.36 M Jup. We checked that the shape of the spectral lines does not vary for this star as well. © ESO 2006;
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页码:717 / 722
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