The Transit Light Curve Project. I. Four Consecutive Transits of the Exoplanet XO-1b
The Transit Light Curve Project. I. Four Consecutive Transits of the Exoplanet XO-1b
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DOI：
10.1086/508155
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发表时间：
2006-07
期刊：
影响因子：
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通讯作者：
M. Holman;J. Winn;D. Latham;F. O'Donovan;D. Charbonneau;G. Bakos;G. Esquerdo;C. Hergenrother;M. Everett;A. Pál
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文献类型：
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作者：
M. Holman;J. Winn;D. Latham;F. O'Donovan;D. Charbonneau;G. Bakos;G. Esquerdo;C. Hergenrother;M. Everett;A. Pál
我们给出了新发现的系外行星XO-1b连续四次凌日的RIZ光度测量结果。我们改进了凌日参数的估计，得到行星半径为Rp=1.184RJ，恒星半径为R⋆=0.928 R☉，假定恒星质量为M⋆=(1.0 0±0.0 3)M☉。行星半径和恒星半径的不确定性主要由恒星质量的不确定性决定。如果假设恒星质量的不确定度更保守，为0.10M☉，则这些不确定度会增加2-3倍。我们对行星半径的估计比McCullough和他的同事报告的要小，结果对XO-1b的平均密度的估计介于低密度行星HD 209458b和高密度行星tres-1和HD 189733b之间。凌日的时间精确度从0.2分钟到2.5分钟不等，与统一的周期略有一致。
We present RIz photometry of four consecutive transits of the newly discovered exoplanet XO-1b. We improve on the estimates of the transit parameters, finding the planetary radius to be RP = 1.184RJ, and the stellar radius to be R⋆ = 0.928 R☉, assuming a stellar mass of M⋆ = (1.00 ± 0.03) M☉. The uncertainties in the planetary and stellar radii are dominated by the uncertainty in the stellar mass. These uncertainties increase by a factor of 2-3 if a more conservative uncertainty of 0.10 M☉ is assumed for the stellar mass. Our estimate of the planetary radius is smaller than that reported by McCullough and coworkers, and the resulting estimate for the mean density of XO-1b is intermediate between that of the low-density planet HD 209458b and the higher density planets TrES-1 and HD 189733b. The timings of the transits have an accuracy ranging from 0.2 to 2.5 minutes and are marginally consistent with a uniform period.