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arXiv 1610.09533astro-ph.EP
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动态确定的WASP-47系统的绝对密度、质量和半径

Absolute densities, masses, and radii of the WASP-47 system determined dynamically

J. M. Almenara, R. F. Díaz, X. Bonfils, S. Udry

摘要:

我们提出了一个自洽的建模的可用的光变曲线和径向速度数据的WASP-47,考虑到系统中所有已知的机构之间的引力相互作用。联合分析多行星系中的光变曲线和径向速度数据,可以在不使用理论恒星模型的情况下导出绝对密度、半径和质量。对于WASP-47,由于K2光变曲线的时间跨度短,因此动态信息减少,从而限制了精度。我们对恒星和凌日行星半径的精确度约为22%,对质量的精确度在40%到60%之间,对密度的精确度在1.5%到38%之间。所有数值均与先前报告的测量值一致。当包括理论恒星模型时,系统参数的确定精度超过了以前的研究,这要归功于光变曲线和径向速度数据的自洽建模。

英文摘要:

We present a self-consistent modelling of the available light curve and radial velocity data of WASP-47 that takes into account the gravitational interactions between all known bodies in the system. The joint analysis of light curve and radial velocity data in a multi-planetary system allows deriving absolute densities, radii, and masses without the use of theoretical stellar models. For WASP-47 the precision is limited by the reduced dynamical information that is due to the short time span of the K2 light curve. We achieve a precision of around 22% for the radii of the star and the transiting planets, between 40% and 60% for their masses, and between 1.5% and 38% for their densities. All values agree with previously reported measurements. When theoretical stellar models are included, the system parameters are determined with a precision that exceeds that achieved by previous studies, thanks to the self-consistent modelling of light curve and radial velocity data.

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