Contact forces between sub-micrometer ice particles in protoplanetary environments

原行星环境中亚微米冰粒之间的接触力

• 批准号: 266114593
• 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: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/266114593?language=en
• 关键词: Contact; forces; between; sub; micrometer

Research on planet formation saw a rapid evolution during the last few decades with respect to theory, observation and experiment. The first phases of planet formation are governed by collisions. It is the strength of the contacts between two particles, which decides if particles grow by sticking or are destroyed. Therefore, to quantify the interaction at the contact level is most fundamental for all further modeling of planet formation. Especially refractory materials like silicates were extensively studied in the laboratory so far. However, the outer regions of protoplanetary disks where cores of giant planets are supposed to be formed are dominated by water ice. The description of water ice contact physics on nanometer and micrometer size scale at low temperatures with application to planet formation only started recently and though very basic the underlying contact forces and torques are currently poorly known. Their measurement only recently became feasible by the development of a thermal gradient force microscope. In the proposed project we will establish this technique and carry out systematic measurements on nanometer to micrometer size water ice particle contacts. This will provide a first experimental database for modeling the early phases of icy planetesimal formation.

过去几十年来，行星形成研究在理论、观测和实验方面取得了快速发展。行星形成的第一阶段是由碰撞控制的。两个粒子之间的接触强度决定了粒子是通过粘附而生长还是被破坏。因此，量化接触层面的相互作用对于所有进一步的行星形成建模至关重要。特别是硅酸盐等耐火材料迄今为止在实验室中得到了广泛的研究。然而，原行星盘的外部区域（本应形成巨行星的核心）主要由水冰组成。对低温下纳米和微米尺寸的水冰接触物理及其应用于行星形成的描述最近才开始，尽管非常基础，但目前对潜在的接触力和扭矩知之甚少。最近，随着热梯度力显微镜的发展，它们的测量才变得可行。在拟议的项目中，我们将建立这项技术并对纳米到微米尺寸的水冰颗粒接触进行系统测量。这将为模拟冰冷星子形成的早期阶段提供第一个实验数据库。

项目成果

SELF-SUSTAINED RECYCLING IN THE INNER DUST RING OF PRE-TRANSITIONAL DISKS

预过渡盘内尘环的自持回收

• DOI: 10.3847/0004-637x/829/2/111
• 发表时间: 2016
• 期刊: The Astrophysical Journal
• 作者: T. Husmann;C. Loesche;G. Wurm
• 通讯作者: G. Wurm