Planetesimal Formation at High Temperatures

高温下的星子形成

• 批准号: 403077938
• 负责人: Professor Dr. Heiko Wende
• 金额: --
• 依托单位: Forschungsgruppe Experimentalphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/403077938?language=en
• 关键词: Planetesimal; Formation; Temperatures

Early phases of planet formation strongly depend of the material properties of the particles present as dust. Especially radial inward drift and high temperatures have a strong influence on the aggregation in the warm, inner parts of protoplanetary disks. First laboratory experiments show that during early phases of planetesimal formation high temperatures indeed can alter the sticking capabilities of dust grains tremendously. This project will study this in a systematic way as the evolution of chondritic as well as model mineral samples from cooler to higher temperatures will be simulated. Protoplanetary analog samples will be produced, heated and their composition will be analyzed by X-ray diffraction, Mössbauer spectroscopy, optical imaging, electronmicroscopical methods and particle size analysis. These samples will be studied cool and warm for static and dynamical sticking properties in tensile strength and collision experiments. Ultimate goal is to develop an idea on the efficiency of local planetesimal formation. Especially, in view of the large number and variation of extrasolar planets within the warm inner parts close to their host stars this is an approach for understanding planet formation that found little consideration so far.

行星形成的早期阶段在很大程度上取决于以尘埃形式存在的颗粒的物质性质。尤其是径向内漂移和高温对原行星盘温暖内部的聚集有很大的影响。首先，实验室实验表明，在小行星形成的早期阶段，高温确实会极大地改变尘埃颗粒的附着能力。这个项目将以系统的方式研究这一点，因为将模拟从较冷到较高温度的球粒陨石以及模型矿物样品的演化。将产生原行星模拟样品，加热，并将通过X射线衍射、穆斯堡尔光谱分析、光学成像、电子显微镜方法和粒度分析来分析其组成。在拉伸强度和碰撞实验中，将研究这些样品的静态和动态粘结性能。最终目标是形成一种关于局部小行星形成效率的想法。特别是，考虑到太阳系外行星在靠近其主恒星的温暖的内部有大量的数量和变化，这是一种理解行星形成的方法，到目前为止还没有得到什么考虑。