发表机构
Monash University; OzGrav: Australian Research Council Centre of Excellence for Gravitational Wave Discovery; National Astronomical Observatories, Chinese Academy of Sciences; Center for Computational Astrophysics, Flatiron Institute; Tsinghua University（莫纳什大学; 澳大利亚研究委员会引力波发现卓越中心; 中国科学院国家天文台; 平顿研究所计算天体物理中心; 清华大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
用微分光谱法和贝叶斯框架重新分析79颗近太阳孪生恒星光谱，测试太阳化学特性源于银河系化学演化还是行星吞噬，获元素丰度，区分相关特征，发现太阳化学特性多由前者驱动并找出疑似行星吞噬恒星。
AI 中文摘要
最近的观测研究表明，太阳相对于大多数太阳孪生恒星可能在化学上具有特殊性。在这里，我们使用微分光谱方法和贝叶斯框架重新分析了79颗附近太阳孪生恒星的高分辨率、高信噪比光谱，以测试太阳的化学特殊性是源于银河系化学演化（GCE）还是行星吞噬。使用光谱工具\texttt{Korg}，我们获得了18种元素的高精度、经过验证的大气参数和丰度，平均丰度精度为0.015 dex（3.5%）。采用独立的贝叶斯指标，我们从影响恒星组成的其他过程中解开了GCE和行星吞噬特征，包括内在丰度散射。我们的结果表明，太阳相对于平均太阳孪生恒星的化学特殊性在很大程度上是由GCE效应驱动的，我们样本中的62.3±5.8%表现出与GCE趋势很好描述的丰度模式。我们进一步确定了2-6颗太阳孪生候选恒星，它们表现出与行星吞噬一致的化学特征，值得进一步研究。这些发现加强了解释太阳孪生丰度模式时考虑GCE效应的重要性，并表明太阳相对于大多数太阳孪生恒星可能在化学上并不特殊。
英文摘要
Recent observational studies have suggested that the Sun may be chemically peculiar relative to the majority of solar twins. Here, we re-analyse high-resolution, high signal-to-noise spectra of 79 nearby solar twins using a differential spectroscopic approach and Bayesian framework to test whether the Sun's chemical peculiarity arises from Galactic chemical evolution (GCE) or planetary ingestion. Using the spectroscopic tool Korg, we obtain highly precise, validated atmospheric parameters and abundances for 18 elements, with an average abundance precision of 0.015dex (3.5%). Employing an independent Bayesian indicator, we disentangle GCE and planetary engulfment signatures from other processes influencing stellar composition, including intrinsic abundance scatter. Our results indicate that the chemical peculiarity of the Sun relative to the average solar twin is largely driven by GCE effects, with 62.3$\pm$5.8% of our sample exhibiting abundance patterns well-described by GCE trends. We further identify 2--6 solar twin candidates exhibiting chemical signatures consistent with planetary engulfment that warrant further investigation. These findings reinforce the importance of accounting for GCE effects when interpreting solar twin abundance patterns, and suggest that the Sun may not be chemically peculiar relative to the majority of solar twins.
Comments23 pages, 15 figures, accepted for publication in The Astrophysical Journal
