Photophoretic motion of chondrules, CAIs and large bodies in the Solar Nebula

太阳星云中球粒、CAI 和大天体的光运动

• 批准号: 145102524
• 负责人: Professor Dr. Gerhard Wurm
• 金额: --
• 依托单位: Forschungsgruppe Experimentalphysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/145102524?language=en
• 关键词: Photophoretic; motion; chondrules; CAIs; large

Photophoretic particle transport in protoplanetary disks or, more specific, in the solar nebula acts in optical thin parts as the surface or at the inner disk edge. Here, it can outnumber stellar gravity or the gravity of the disk. During the last periods of the project the strength of the photophoretic force on chondrules and other particles could be determined to high accuracy. Part of this was a systematic study starting from determining the 3d composition by tomography over calculating the heat transfer in illuminated particles to real experimental measurements of photophoretic forces on the same particles under microgravity of a drop tower. For the first time this provided equations which are accurate enough to treat sorting and concentration of particles through photophoretic transport. One main goal of the project is to develop such transport models. They will be used to study how particles of different size and composition are sorted or concentrated in different regions of the edge. This study will be extended to larger bodies as well. Overall, this will allow to study the distribution of matter from dust size to km-planetesimals in the early solar system and estimate the importance of photophoresis in this.

在原行星盘中，或者更具体地说，在太阳星云中，光泳粒子的传输作用在光学薄的部分，如表面或内部盘边缘。在这里，它的数量可以超过恒星引力或盘的引力。在项目的最后阶段，可以高精度地确定球粒和其他粒子上的电泳力的强度。这部分是一个系统的研究，从确定三维组成的断层扫描计算在照明粒子的热传递真实的实验测量相同的粒子在微重力下的落塔。这是第一次提供的方程是足够准确的处理分选和浓度的颗粒通过电泳运输。该项目的一个主要目标是开发这种运输模型。它们将用于研究不同尺寸和成分的颗粒如何在边缘的不同区域进行分类或集中。这项研究也将扩大到更大的机构。总的来说，这将允许研究早期太阳系中从尘埃大小到千米微行星的物质分布，并估计光泳在其中的重要性。