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arXiv 0903.2687astro-ph.SRastro-ph.EP
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交通灯曲线项目。XII。系外行星XO-2b的六次凌日

The Transit Light Curve Project. XII. Six Transits of the Exoplanet XO-2b

Jose M. Fernandez, Matthew J. Holman, Joshua N. Winn, Guillermo Torres, Avi Shporer, Tsevi Mazeh, Gilbert A. Esquerdo, Mark E. Everett

摘要:

介绍了系外行星XO-2b六次凌日的测光结果。通过结合光变曲线分析和理论等时线来确定恒星的性质,我们发现行星半径为0.996 + 0.031/-0.018 rjup,行星质量为0.565 +/-0.054 mjup。这些结果与先前报道的结果一致,也与气体巨行星的理论模型一致。中间传输时间精确到1分钟内,并且与恒定周期一致。然而,我们得出的周期与之前公布的周期相差2.5 sigma。需要更多的数据来判断这个周期是否实际上是可变的(就像存在额外的身体一样),或者是否低估了时间误差。

英文摘要:

We present photometry of six transits of the exoplanet XO-2b. By combining the light-curve analysis with theoretical isochrones to determine the stellar properties, we find the planetary radius to be 0.996 +0.031/-0.018 rjup and the planetary mass to be 0.565 +/- 0.054 mjup. These results are consistent with those reported previously, and are also consistent with theoretical models for gas giant planets. The mid-transit times are accurate to within 1 min and are consistent with a constant period. However, the period we derive differs by 2.5 sigma from the previously published period. More data are needed to tell whether the period is actually variable (as it would be in the presence of an additional body) or if the timing errors have been underestimated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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