title: The Spectroscopic Orbit of the Planetary Companion Transiting HD 209458.
abstract: We report a spectroscopic orbit with period P=3.52433+/-0.00027 days for the planetary companion that transits the solar-type star HD 209458. For the metallicity, mass, and radius of the star, we derive [Fe/H&sqbr0;=0.00+/-0.02, M*=1.1+/-0.1 M middle dot in circle, and R*=1.2+/-0.1 R middle dot in circle. This is based on a new analysis of the iron lines in our HIRES template spectrum and also on the absolute magnitude, effective temperature, and color of the star, and it uses isochrones from four different sets of stellar evolution models. Using these values for the stellar parameters, we reanalyze the transit data and derive an orbital inclination of i=86&fdg;1+/-1&fdg;6. For the planet, we derive a mass of Mp=0.69+/-0.05 MJup, a radius of Rp=1.40+/-0.17 RJup, and a density of rho=0.31+/-0.07 g cm-3.
authors.initials: T
authors.lastname: Mazeh
authors.initials: D
authors.lastname: Naef
authors.initials: G
authors.lastname: Torres
authors.initials: DW
authors.lastname: Latham
authors.initials: M
authors.lastname: Mayor
authors.initials: JL
authors.lastname: Beuzit
authors.initials: TM
authors.lastname: Brown
authors.initials: L
authors.lastname: Buchhave
authors.initials: M
authors.lastname: Burnet
authors.initials: BW
authors.lastname: Carney
authors.initials: D
authors.lastname: Charbonneau
authors.initials: GA
authors.lastname: Drukier
authors.initials: JB
authors.lastname: Laird
authors.initials: F
authors.lastname: Pepe
authors.initials: C
authors.lastname: Perrier
authors.initials: D
authors.lastname: Queloz
authors.initials: NC
authors.lastname: Santos
authors.initials: JP
authors.lastname: Sivan
authors.initials: S
authors.lastname: Udry
authors.initials: S
authors.lastname: Zucker