Paper: astro-ph/0510048
Date: Mon, 3 Oct 2005 16:08:58 GMT (56kb)

Title: Elodie metallicity-biased search for transiting Hot Jupiters I. Two
Hot Jupiters orbiting the slightly evolved stars HD118203 and HD149143

Authors: R. Da Silva, S. Udry, F. Bouchy, M. Mayor, C. Moutou, F. Pont, D.
Queloz, N.C. Santos, D. Segransan, S. Zucker

Categories: astro-ph

Comments: Accepted in A&A (6 pages, 6 figures)
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We report the discovery of a new planet candidate orbiting the subgiant star
HD118203 with a period of P=6.1335 days. The best Keplerian solution yields an
eccentricity e=0.31 and a minimum mass m2sin(i)=2.1MJup 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, HD149143, 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 1.36MJup. We checked that the shape of the spectral
lines does not vary for this star as well.

\\ ( http://arXiv.org/abs/astro-ph/0510048 , 56kb)