最外侧原行星盘的核合成指纹与早期太阳系动力学
The nucleosynthetic fingerprint of the outermost protoplanetary disk and early Solar System dynamics
AI总结：
研究通过原始陨石中的外盘物质核合成与同位素证据，揭示彗星形成区成分普遍存在于外太阳系，并归因于分子云晚期吸积流的加入。
摘要：
了解最外侧原行星盘的核合成同位素组成，对于理解太阳系的形成及其早期动力学演化至关重要。我们报告在一块原始陨石中发现了保存下来的外盘物质，其依据是该物质的化学组成、富含有机质的岩石学特征，以及富15N、富氘且贫16O的同位素特征。我们推断，这种外盘物质起源于形成彗星的区域。该物质的核合成Fe、Mg、Si和Cr组成揭示，与当前观点相反，形成彗星区域的同位素特征在外太阳系天体中普遍存在，可能反映了外太阳系中一种重要的行星构建材料。这一核合成组分代表了通过与周围分子云相连的晚期吸积流加入外盘的新鲜物质。我们的结果表明，大多数太阳系碳质小行星都吸积了来自形成彗星区域的物质，而类地行星区域则缺乏这一特征。
英文摘要：
Knowledge of the nucleosynthetic isotope composition of the outermost protoplanetary disk is critical to understand the formation and early dynamical evolution of the Solar System. We report the discovery of outer disk material preserved in a pristine meteorite based on its chemical composition, organic-rich petrology, and 15N-rich, deuterium-rich, and 16O-poor isotope signatures. We infer that this outer disk material originated in the comet-forming region. The nucleosynthetic Fe, Mg, Si and Cr compositions of this material reveal that, contrary to current belief, the isotope signature of the comet-forming region is ubiquitous amongst outer Solar System bodies, possibly reflecting an important planetary building block in the outer Solar System. This nucleosynthetic component represents fresh material added to the outer disk by late accretion streamers connected to the ambient molecular cloud. Our results show that most Solar System carbonaceous asteroids accreted material from the comet-forming region, a signature lacking in the terrestrial planet region.
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