富含尘埃、气体匮乏的原太阳盘是球粒的诞生地
The dust-rich, gas-depleted protosolar disk as the birthplace of chondrules
AI总结：
本研究提出碎屑尘埃轰击偏心星子的新机制，解释气体匮乏原太阳盘中球粒的形成，将木星形成、原太阳盘演化与类地行星等天体起源关联，为太阳系形成提供新框架。
AI中文摘要：
球粒是被称为球粒陨石的原始陨石的主要组成部分，理解它们的形成与堆积对阐明太阳系的行星形成历史至关重要。尽管已提出多种球粒形成机制，但要在单一模型中同时满足球粒丰度、形成时间及矿物学、化学特征的关键约束仍具挑战性。尤其曾被视为主要候选机制之一的星子弓激波模型，如今面临一个根本难题：木星的形成可能耗尽了原太阳盘的气体，或将气体密度降至星子弓激波高效形成球粒所需的阈值以下。本文提出一种可在气体匮乏环境中发生的替代机制： debris dust（ debris dust 即 debris 尘埃，指天体碰撞产生的碎屑尘埃）对偏心星子的猛烈轰击。木星在原太阳盘形成后，其轨道内侧区域变得气体匮乏，形成了几何上较薄的 debris dust 层；当星子以高速进入该尘埃层时，会产生大量熔融硅酸盐液滴，这些液滴冷却凝固后成为球粒，并重新并入尘埃层。通过分析计算，我们发现该模型有望解释球粒的丰度、形成时间及矿物学、化学特征。本研究将木星的形成及随之而来的原太阳盘演化与类地行星、小行星和陨石的起源关联起来，为太阳系的形成提供了新的框架。
英文摘要：
Chondrules are the primary components of primitive meteorites known as chondrites, and understanding their formation and accumulation is essential for elucidating the history of planet formation in the Solar System. Although a variety of chondrule formation mechanisms have been proposed, it remains challenging to satisfy the key constraints on chondrule abundance, formation timing, and mineralogical and chemical characteristics within a single model. In particular, the planetesimal bow-shock model, once considered one of the leading candidates, now faces a fundamental difficulty: Jupiter's formation likely depleted gas in the protosolar disk, potentially lowering the gas density below that required for efficient chondrule formation by planetesimal bow shocks. Here we propose an alternative mechanism that can occur in a gas-depleted environment: heavy bombardment of eccentric planetesimals by debris dust. After Jupiter formed in the protosolar disk, the region interior to its orbit became gas-depleted, leading to the formation of a geometrically thin debris-dust layer. When planetesimals enter the dust layer at high speed, large quantities of molten silicate droplets are produced. These droplets cool and solidify into chondrules and are reincorporated into the dust layer. Using analytical calculations, we find that our model can potentially explain the abundance, formation timing, and mineralogical and chemical characteristics of chondrules. This study links the formation of Jupiter and the accompanying evolution of the protosolar disk to the origin of terrestrial planets, asteroids, and meteorites, thereby offering a new framework for the formation of the Solar System.
