Modeling the evolution of the dust population in protoplanetary disks

模拟原行星盘中尘埃群的演化

• 批准号: 158702285
• 负责人: Professor Dr. Cornelis Petrus Dullemond
• 金额: --
• 依托单位: Max-Planck-Institut für Astronomie (MPIA)
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/158702285?language=en
• 关键词: Modeling; evolution; dust; population; protoplanetary

The collision experiments in the lab and in SPH simulations teach us about the outcome of individual collisions between aggregates under well-defined initial conditions such as impact velocity, target/projectile mass etc. However, what the long term evolution is of a large ensemble of dust aggregates over millions of collisions cannot be determined through such experiments alone. The project we propose here is aimed to bring together the results of the B-projects into an empirical ‘coagulation-fragmentation kernel’. We will then implement that into two different types of numerical models of grain growth/fragmentation, and investigate the long term effects of the lab results on the collisional growth of solids in a protoplanetary disk. In addition to yielding this scientific end product, it will also reveal which parts of collision parameter space are important and may need further experimentation in the lab. Feedback to the B-projects is therefore an integral part of this project. The ultimate aim is to provide a unified picture of the process of growth from sub-micron sized particles to kilometer sized planetesimals based for a large part on the results from the Forschergruppe.

在实验室中的碰撞实验和SPH模拟教我们在定义良好的初始条件下，如碰撞速度，目标/弹丸质量等，但是，什么是长期的演变是一个大的合奏的尘埃聚集超过数百万的碰撞不能确定单独通过这样的实验之间的个体碰撞的结果。我们在这里提出的项目旨在将B项目的结果汇集到一个经验性的“凝聚-碎片内核”中。然后，我们将实施到两种不同类型的晶粒生长/破碎的数值模型，并调查的长期影响的实验室结果的碰撞生长的固体在原行星盘。除了产生这一科学最终产品外，它还将揭示碰撞参数空间的哪些部分是重要的，可能需要在实验室中进行进一步的实验。因此，对B项目的反馈是该项目的一个组成部分。最终的目标是提供一个统一的图片的过程中，从亚微米大小的颗粒，公里大小的星子的基础上，从研究小组的结果的很大一部分。