外星世界能有多外星？
How alien can alien worlds be?
摘要：
在试图选择恒星，可以主机与我们自己的特征相似的行星，我们选择了七个太阳型恒星已知的主机行星在宜居带和光谱恒星参数。对于这些恒星，我们估计了O，C，Mg和Si的“经验”丰度，进而我们使用Santos等人（2015）提出的模型推导出行星构建块的铁和水团质量分数。我们的研究结果表明，如果岩石行星围绕这些恒星运行，它们之间的成分可能会显着不同，并且与我们地球的成分不同。然而，为了对位于宜居带的系外行星和我们自己的行星的成分特性进行有意义的比较，一个复杂得多的分析（例如Dorn等人，2017年）的大量系统与精确的质量和半径的行星，和准确的化学丰度的主恒星。这里介绍的工作只是朝着这个方向迈出的第一步。
英文摘要：
In an attempt to select stars that can host planets with characteristics similar to our own, we selected seven solar-type stars known to host planets in the habitable zone and for which spectroscopic stellar parameters are available. For these stars we estimated 'empirical' abundances of O, C, Mg and Si, which in turn we used to derive the iron and water mass fraction of the planet building blocks with the use of the model presented in Santos et al. (2015). Our results show that if rocky planets orbit these stars they might have significantly different compositions between themselves and different from that of our Earth. However, for a meaningful comparison between the compositional properties of exoplanets in the habitable zone and our own planet, a far more sophisticated analysis (e.g. Dorn et al., 2017) of a large number of systems with precise mass and radius of planets, and accurate chemical abundances of the host stars. The work presented here is merely the first humble step in this direction.
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。
