标题： 位于近距轨道的岩石行星组成趋于类地 显示英文标题

标题： The Compositions of Rocky Planets in Close-in Orbits Tend to be Earth-Like

摘要： 已发现数百颗直径介于地球的 1 到 1.8 倍之间的系外行星，它们运行轨道非常接近恒星。然而，这些行星表现出极大的密度多样性，有些似乎完全由铁构成，而另一些则似乎拥有气体包层。 为了检验这种成分多样性，我们更新了 5 颗岩石系外行星（HD 93963 A b、Kepler-10 b、Kepler-100 b、Kepler-407 b 和 TOI-1444 b）的质量，并利用来自双子座/MAROON-X 和凯克/KPF 的 187 次高精度视向速度测量确认了一颗新行星（TOI-1011）。我们的更新结果显示，样本中所有行星的质量更接近地球而非先前文献中的值。特别是，我们报告称之前被识别为“超级水星”的两颗行星（Kepler-100 b 和 HD 93963 A b）具有更低的质量，表明它们的铁含量较低。然后我们将行星中铁与造岩元素的比例与宿主恒星中这些元素的丰度比进行了比较。这些更新后的行星组成并不支持行星和宿主恒星成分之间存在陡峭关系的结果，与之前的结论相反，反而表明行星和宿主恒星具有相似的元素丰度比。 显示英文摘要

摘要： Hundreds of exoplanets between 1-1.8 times the size of the Earth have been discovered on close in orbits. However, these planets show such a diversity in densities that some appear to be made entirely of iron, while others appear to host gaseous envelopes. To test this diversity in composition, we update the masses of 5 rocky exoplanets (HD 93963 A b, Kepler-10 b, Kepler-100 b, Kepler-407 b, and TOI-1444 b) and present the confirmation of a new planet (TOI-1011) using 187 high precision RVs from Gemini/MAROON-X and Keck/KPF. Our updated planet masses suggest compositions closer to that of the Earth than previous literature values for all planets in our sample. In particular, we report that two previously identified ``super-Mercuries'' (Kepler-100 b and HD 93963 A b) have lower masses that suggest less iron-rich compositions. We then compare the ratio of iron to rock-building species to the abundance ratios of those elements in their host stars. These updated planet compositions do not suggest a steep relationship between planet and host star compositions, contradictory to previous results, and suggest that planets and host stars have similar abundance ratios.