The Spectroscopic Orbit of the Planetary Companion Transiting HD209458

Details The Spectroscopic Orbit of the Planetary Companion Transiting HD209458 The Spectroscopic Orbit of the Planetary Companion Transiting HD209458

2000-01-16

arxiv.org/abs/astro-ph/0001284v1

Astronomy and Astrophysics

Astrophysics

11 pages, 1 figure, 2 tables, LaTex, aastex, accepted for publication by ApJ Letters

Scientific paper

10.1086/312558

We report a spectroscopic orbit with period P = 3.52433 +/- 0.00027 days for the planetary companion that transits the solar-type star HD209458. For the metallicity, mass, and radius of the star we derive [Fe/H] = 0.00 +/- 0.02, M = 1.1 +/- 0.1 solar masses, and R = 1.3 +/- 0.1 solar radii. This is based on a new analysis of the iron lines in our HIRES template spectrum, and also on the absolute magnitude and color of the star, and 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 = 85.2 +/- 1.4 degrees. For the planet we derive a mass of Mp = 0.69 +/- 0.05 Jupiter masses, a radius of Rp = 1.54 +/- 0.18 Jupiter radii, and a density of 0.23 +/- 0.08 grams per cubic cm.

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