发表机构
Chalmers University of Technology（查尔姆斯理工大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本论文通过三个研究，揭示了多行星系统内轨道间距的相似性、单多行星系统行星种群的共性，以及气态巨行星对系统内其他行星性质的影响，为行星形成与演化提供了新约束。
AI 中文摘要
与观测到的系外行星多样性相反，许多多行星系统中的行星在半径、质量和轨道间距方面表现出系统内相似性。本论文研究行星性质和系统架构，重点关注系统内相似性、推断的行星内部组成以及单行星系统与多行星系统之间的差异。论文A表明，同一系统中的行星即使大小或质量不同，其轨道间距也往往相似。这种间距相似性在轨道周期比方面比在相互希尔间距方面更为显著，而轨道周期比与相邻行星的质量相关性比与半径的相关性更强。这些结果表明，均匀的轨道间距代表了一种常见的架构属性，并不一定与行星大小或质量的相似性相关。论文B比较了观测到的单行星系统和多行星系统中的凌星行星。在排除热木星后，围绕FGK恒星运行的单行星和多行星的行星类型和半径分布没有显著差异，表明存在共同的行星种群基础。然而，在FGK主序星周围，在特定的行星半径范围内发现了多行星的过度存在。论文C发现，在探测到气态巨行星的系统中，非气态巨行星平均比未探测到气态巨行星的系统中的行星更大、更重、间距更不规则。相邻行星在半径、质量和体密度方面表现出显著相似性，而它们推断的核质量分数和水质量分数则表现出显著分散且无强相关性。这些结果表明，体性质的相似性并不一定转化为组成的相似性。这些研究为支配行星形成和演化的过程提供了新的约束。
英文摘要
In contrast to the observed exoplanet diversity, planets within many multi-planetary systems exhibit intra-system similarities in their radii, masses, and orbital spacings. This thesis investigates the planetary properties and system architectures, focusing on the intra-system similarities, the inferred planetary interior compositions, and the differences between single- and multi-planetary systems. Paper A shows that planets within the same system tend to have similar orbital spacings even when their sizes or masses differ. The spacing similarity is more pronounced in orbital period ratios than in mutual Hill separations, while the period ratios are more strongly correlated with the masses than with the radii of adjacent planets. These results indicate that uniform orbital spacings represent a common architectural property and are not necessarily associated with similarities in planetary size or mass. Paper B compares transiting planets in observed single- and multi-planetary systems. After excluding hot Jupiters, the distributions of planet types and radii of singles and multis orbiting FGK stars show no significant differences, suggesting a common underlying planet population. Around FGK host stars, however, an overabundance of multis is identified within a specific planet radius range. Paper C finds that non-gas-giant planets in systems hosting detected gas giants are, on average, larger, more massive, and more irregularly spaced than planets in systems without detected gas giants. Adjacent planets exhibit significant similarities in radius, mass, and bulk density, whereas their inferred core and water mass fractions show substantial scatter and no strong correlations. These results indicate that similarities in bulk properties do not necessarily translate into similarities in compositions. These studies place new constraints on the processes governing planet formation and evolution.
CommentsPhD thesis. October 2026. Abridged abstract. ISBN: 978-91-8103-487-5
