Journal
ASTROPHYSICAL JOURNAL
Volume 683, Issue 2, Pages 1076-1084Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/589737
Keywords
planetary systems; stars : individual (GSC 03727-01064, XO-3)
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Funding
- NASA [NNG06GH69G, NNG04LG89G, 05-SSO05-86, NAG5-13130]
- United States-Israel Binational Science Foundation (BSF), Jerusalem, Israel [2006234]
- Kepler mission [NCC2-1390]
- Kepler mission
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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: Rp = 1.217 +/- 0.073 R-Jup. A conflict remains between the mean stellar density determined fromthe light curve, and the stellar surface gravity determined fromthe 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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