Transit Photometry of the Core-dominated Planet HD 149026b
Transit Photometry of the Core-dominated Planet HD 149026b
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核心主导行星凌日光度测量 HD 149026b
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
F. O'Donovan
中科院分区：
文献类型：
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作者：
D. Charbonneau;J. Winn;D. Latham;G. Bakos;E. Falco;M. Holman;R. Noyes;B. Csák;G. Esquerdo;M. Everett;F. O'Donovan
我们报告g，V和r的光度时间序列的HD 149026跨越预测的时间过境的土星质量的行星伴侣，这是最近发现的佐藤和合作者。我们提出了一个联合分析，我们的意见和以前报道的测光和径向速度的中心星星。我们改进了凌日星历的估计为Tc =（2，453，527.87455）+（2.87598）N（HJD）。假设这颗星星的半径为1.45 ± 0.10 R，质量为1.30 ± 0.10 M，我们估计行星的半径为（0.726 ± 0.064）R，这意味着平均密度为1.07 g cm-3。这一密度明显大于包括恒星日照影响的模型的预测，其中行星只有一个小的固体物质核心。因此，我们确认这颗行星可能包含一个大的核心，核心质量与行星总质量的比率更接近天王星和海王星，而不是木星或土星。
We report g, V, and r photometric time series of HD 149026 spanning predicted times of transit of the Saturn-mass planetary companion, which was recently discovered by Sato and collaborators. We present a joint analysis of our observations and the previously reported photometry and radial velocities of the central star. We refine the estimate of the transit ephemeris to Tc = (2,453,527.87455) + (2.87598)N (HJD). Assuming that the star has a radius of 1.45 ± 0.10 R☉ and a mass of 1.30 ± 0.10 M☉, we estimate the planet radius to be (0.726 ± 0.064)RJup, which implies a mean density of 1.07 g cm-3. This density is significantly greater than predicted for models that include the effects of stellar insolation and in which the planet has only a small core of solid material. Thus, we confirm that this planet likely contains a large core and that the ratio of core mass to total planet mass is more akin to that of Uranus and Neptune than to either Jupiter or Saturn.