TY - JOUR
T1 - ELODIE metallicity-biased search for transiting Hot Jupiters I. Two Hot Jupiters orbiting the slightly evolved stars HD 118203 and HD 149143
AU - Da Silva, R.
AU - Udry, S.
AU - Bouchy, F.
AU - Mayor, M.
AU - Moutou, C.
AU - Pont, F.
AU - Queloz, D.
AU - Santos, N. C.
AU - Ségransan, D.
AU - Zucker, S.
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
KW - Planetary systems
KW - Stars: individual: HD 118203
KW - Stars: individual: HD 149143
KW - Techniques: radial velocities
UR - http://www.scopus.com/inward/record.url?scp=31544455535&partnerID=8YFLogxK
U2 - 10.1051/0004-6361:20054116
DO - 10.1051/0004-6361:20054116
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AN - SCOPUS:31544455535
SN - 0004-6361
VL - 446
SP - 717
EP - 722
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
IS - 2
ER -