AI 中文总结
研究球粒陨石母体形成，提出在类地行星形成后期通过胚胎碰撞形成含球粒陨石小行星，其熔融物质冷却成球粒并与未熔融物质混合成卫星，后因引力作用成球粒陨石母体，解释其形成时间与物理性质。
AI 中文摘要
球粒陨石由以前部分熔融的物质（称为球粒）组成，周围是细粒基质。它们起源于太阳系历史的最早时期。然而，它们在行星形成中的作用尚不确定，部分原因是不清楚它们是如何产生的。在这里，我们展示了一条在类地行星形成后期通过胚胎 - 胚胎碰撞形成含球粒陨石小行星的稳健途径。这些撞击产生的熔融物质冷却成球粒，并与由喷出物形成的以胚胎为中心的盘中的未熔融物质混合。这种物质积聚成许多小行星大小的卫星。这些物体后来由于与其他胚胎的引力相互作用而被喷射到日心轨道上，从而成为球粒陨石的母体。这种机制提供了一条在与测量的球粒年龄相符的时间内在太阳系历史中形成球粒陨石的途径，同时解释了它们的许多物理性质。
英文摘要
Chondrites are composed of formerly partially molten material, known as chondrules, surrounded by fine-grained matrix. They date from the earliest times in Solar System history. However, their role in the formation of the planets is uncertain because, in part, it is not clear how they were produced. Here, we show a robust pathway for forming meteorite-producing asteroids that contain chondrules through embryo-embryo collisions during the late stages of terrestrial planet formation. Melted material from these impacts cool into chondrules and mix with unmelted material in embryo-centric disks that formed from the ejecta. This material accretes into numerous asteroid-sized satellites. These objects are later ejected onto heliocentric orbits because of gravitational encounters with other embryos, thereby becoming the parent bodies of chondrites. This mechanism provides a pathway to form chondrites in Solar System history at times commensurate with measured chondrule ages, while explaining many of their physical properties.
Comments32 pages, 6 Figures, published in Sci. Adv
