标题： 灶神星和谷神星：穿越太阳系的历史 显示英文标题

标题： Vesta and Ceres: crossing the history of the Solar System

摘要： 太阳系的演化可以简要地分为三个不同的阶段：太阳星云阶段、原始太阳系阶段和现代太阳系阶段。 这三个时期具有非常不同的条件，从物理条件和作用于其中的过程来看都是如此。 在太阳星云阶段，由于短寿命放射性同位素的衰变，行星esimal 和行星胚胎形成并分化。 同时，巨行星形成了它们的核心，并吸积了星云气体以达到现在的质量。 在气体消散之后，原始太阳系开始其演化。 在内太阳系，行星胚胎形成了类地行星，并且在巨行星的引力扰动作用下，耗尽了残留的行星esimal 群体。 在外太阳系，巨行星经历了一个剧烈而混乱的轨道重组阶段，导致了后期重轰炸。 然后，年轻太阳系迅速而激烈的演化让位于现代太阳系更为规律的长期演化。 灶神星通过与HED陨石的联系，可能还有谷神星，都是太阳系历史上最早形成的天体之一。 在这里，我们讨论它们形成和演化的时标，以及它们在经过太阳系历史的不同阶段时会受到怎样的影响，以便为解释黎明号任务将提供给它们的数据建立一个参考框架。 显示英文摘要

摘要： The evolution of the Solar System can be schematically divided into three different phases: the Solar Nebula, the Primordial Solar System and the Modern Solar System. These three periods were characterized by very different conditions, both from the point of view of the physical conditions and from that of the processes there were acting through them. Across the Solar Nebula phase, planetesimals and planetary embryos were forming and differentiating due to the decay of short-lived radionuclides. At the same time, giant planets formed their cores and accreted the nebular gas to reach their present masses. After the gas dispersal, the Primordial Solar System began its evolution. In the inner Solar System, planetary embryos formed the terrestrial planets and, in combination with the gravitational perturbations of the giant planets, depleted the residual population of planetesimals. In the outer Solar System, giant planets underwent a violent, chaotic phase of orbital rearrangement which caused the Late Heavy Bombardment. Then the rapid and fierce evolution of the young Solar System left place to the more regular secular evolution of the Modern Solar System. Vesta, through its connection with HED meteorites, and plausibly Ceres too were between the first bodies to form in the history of the Solar System. Here we discuss the timescale of their formation and evolution and how they would have been affected by their passage through the different phases of the history of the Solar System, in order to draw a reference framework to interpret the data that Dawn mission will supply on them.