标题： 富含金属的恒星会形成富含金属的行星吗？ 从主星丰度中获得的关于巨行星形成的新的见解 显示英文标题

标题： Do Metal-Rich Stars Make Metal-Rich Planets? New Insights on Giant Planet Formation from Host Star Abundances

摘要： 巨行星及其宿主恒星的组成之间的关系对于理解行星形成具有根本意义。 太阳系的巨行星在金属（重元素）方面高于太阳组成，既在其可见大气中，也在整体组成中。 一个关键问题是，巨行星的金属富集是否与其宿主恒星的金属富集相关。 Thorngren 等（2016）表明，在温度较低（Teq < 1000 K）的巨行星中，总重元素质量随着总 Mp 增加，而相对于母恒星的重元素富集度随着总 Mp 增加而减少。 在他们的研究中，宿主恒星金属丰度是通过文献中的 [Fe/H] 测量得出的。 在这里，我们进行了一项更详细和统一的研究，以确定不同的宿主恒星金属（C、O、Mg、Si、Fe 和 Ni）是否与它们的行星的整体金属丰度相关，使用相关性检验和贝叶斯线性拟合。 我们提供了 19 个低温巨行星系统的新的宿主恒星丰度，并将这些与现有的宿主恒星数据结合，总共得到 22 个低温巨行星系统（24 颗行星）。 令人惊讶的是，我们发现恒星金属丰度与行星剩余金属丰度（相对于仅由行星质量预期的金属量而言的相对金属量）之间没有明显的相关性，这与行星形成模型的常见预测相矛盾。 我们还发现剩余行星金属与恒星挥发性元素与难熔元素比值之间可能存在相关性。 这些结果为巨行星和宿主恒星组成之间提供了引人入胜的新关系，供未来的行星形成建模研究使用。 显示英文摘要

摘要： The relationship between the compositions of giant planets and their host stars is of fundamental interest in understanding planet formation. The solar system giant planets are enhanced above solar composition in metals, both in their visible atmospheres and bulk compositions. A key question is whether the metal enrichment of giant exoplanets is correlated with that of their host stars. Thorngren et al. (2016) showed that in cool (Teq < 1000 K) giant exoplanets, the total heavy-element mass increases with total Mp and the heavy element enrichment relative to the parent star decreases with total Mp. In their work, the host star metallicity was derived from literature [Fe/H] measurements. Here we conduct a more detailed and uniform study to determine whether different host star metals (C, O, Mg, Si, Fe, and Ni) correlate with the bulk metallicity of their planets, using correlation tests and Bayesian linear fits. We present new host star abundances of 19 cool giant planet systems, and combine these with existing host star data for a total of 22 cool giant planet systems (24 planets). Surprisingly, we find no clear correlation between stellar metallicity and planetary residual metallicity (the relative amount of metal versus that expected from the planet mass alone), which is in conflict with common predictions from formation models. We also find a potential correlation between residual planet metals and stellar volatile-to-refractory element ratios. These results provide intriguing new relationships between giant planet and host star compositions for future modeling studies of planet formation.