The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO-3b

Details The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO-3b The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO-3b

2008-04-28

arxiv.org/abs/0804.4475v1

Astronomy and Astrophysics

Astrophysics

To appear in ApJ [22 pages]

Scientific paper

10.1086/589737

We present photometry of 13 transits of XO-3b, a massive transiting planet on an eccentric orbit. Previous data led to two inconsistent estimates of the planetary radius. Our data strongly favor the smaller radius, with increased precision: R_p = 1.217 +/- 0.073 R_Jup. A conflict remains between the mean stellar density determined from the light curve, and the stellar surface gravity determined from the shapes of spectral lines. We argue the light curve should take precedence, and revise the system parameters accordingly. The planetary radius is about 1 sigma larger than the theoretical radius for a hydrogen-helium planet of the given mass and insolation. To help in planning future observations, we provide refined transit and occultation ephemerides.

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