标题： 重新审视岩石系外行星与恒星成分之间的关系：对超级水星种群的证据减少 显示英文标题

标题： Revisiting the Relationship Between Rocky Exoplanet and Stellar Compositions: Reduced Evidence for a Super-Mercury Population

摘要： 行星及其环绕的恒星都来源于同一团气体和尘埃云，而类地系外行星的原始组成被认为具有与宿主恒星一致的铁和难熔元素丰度比。 为了验证这一假设，我们对20颗超级地球大小（1-1.8R$_{\oplus}$）的系外行星进行了内部铁与岩石比例的建模，这些行星围绕着恒星参数均匀测量的恒星运行。 我们计算了每颗行星的核心质量分数，以及基于其铁和镁丰度的每颗宿主恒星的等效“核心质量分数”。 然后，我们使用两种方法（普通最小二乘法和正交距离回归法）在行星和恒星的核心质量分数之间拟合线性相关关系，这两种方法得到的斜率存在显著差异（分别为m=1.3$\pm$ 1.0和m=5.6$\pm$ 1.6）。 此外，我们发现75$\%$ 的行星的核心质量分数与其宿主恒星在1$\sigma$ 范围内一致，并未识别出高密度的超级水星群体。 总体而言，我们认为当前观测数据的不确定性以及建模方法的差异阻碍了关于行星与宿主恒星化学组成之间关系的明确结论。 显示英文摘要

摘要： Planets and the stars they orbit are born from the same cloud of gas and dust, and the primordial compositions of rocky exoplanets have been assumed to have iron and refractory abundance ratios consistent with their host star. To test this assumption, we modeled the interior iron-to-rock ratio of 20 super-Earth sized (1-1.8R$_{\oplus}$) exoplanets around stars with homogeneously measured stellar parameters. We computed the core mass fraction for each planet and an equivalent ``core mass fraction'' for each host star based on its Fe and Mg abundances. We then fit a linear correlation using two methods (Ordinary Least Squares and Orthogonal Distance Regression) between planetary and stellar core mass fraction, obtaining substantially different slopes between these two methods (m=1.3 $\pm$ 1.0 and m=5.6 $\pm$ 1.6, respectively). Additionally, we find that 75$\%$ of planets have a core mass fraction consistent with their host star to within 1$\sigma$, and do not identify a distinct population of high-density super-Mercuries. Overall, we conclude that current uncertainties in observational data and differences in modeling methods prevent definitive conclusions about the relationship between between planet and host star chemical compositions.