AI 中文总结
本研究重新分析原行星盘流体动力学模拟，发现表面质量密度与声速均触发碎裂，冷物质内流及中平面与上层气体相互作用可促进碎裂，或形成化学性质不同的行星碎片。
AI 中文摘要
以往对引力不稳定盘的三维流体动力学模拟表明，单个碎片的形成会触发后续碎片的形成，该行为被归因于第一个碎片与盘物质相互作用导致的表面质量密度变化。本研究重新分析这些模拟，以探究表面质量密度是否为唯一驱动因素。结果显示，表面质量密度和声速均可促成额外碎片的形成；除这类盘典型的普遍冷却外，由第一个碎片形成驱动的、来自外盘的冷物质向内运动，可增强内区的碎裂；还发现盘的中平面气体与较冷上层之间的相互作用可促进额外冷却。触发碎裂通过重新分布盘内物质，可形成独特的行星形成环境，可能产生与原位形成碎片化学性质不同的碎片。
英文摘要
Previous three-dimensional hydrodynamical simulations of gravitationally unstable discs have shown that the formation of a single fragment can trigger the formation of subsequent fragments. This behaviour was attributed to changes in the surface mass density caused by the interaction between the first fragment and the disc material. This study reanalyses those simulations to see if the surface mass density was the sole driver. Our results reveal that both surface mass density and sound speed can contribute to the formation of additional fragments. Beyond the general cooling typical of such discs, the inwards movement of cool material from the outer disc, driven by the formation of the first fragment, can enhance fragmentation in the inner regions. We also identify that interactions between the midplane gas and the cooler upper layers of the disc can facilitate additional cooling. Triggered fragmentation can create a unique planet-formation environment by redistributing material across the disc, potentially leading to chemically distinct fragments from those formed in-situ.
Comments9 pages, 8 figures; accepted for publication in MNRAS
