Signposts of Planetary Systems around Evolved Stars: A New Perspective on Extrasolar Planets

演化恒星周围行星系统的路标：太阳系外行星的新视角

• 批准号: 1551130
• 负责人: Roman Rafikov
• 金额: $ 39.65万
• 依托单位: Institute For Advanced Study
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1551130&HistoricalAwards=false
• 关键词: Signposts; Planetary; Systems; around; Evolved

This is an award to study asteroid belts and debris disks orbiting white dwarfs in order to better understand the general nature of planetary systems. White dwarfs are very dense stellar remnants produced at the end of a low-mass star's life, and composed mainly of electron-degenerate matter. Any debris disk or planetary system orbiting a white dwarf is thought to have survived from an earlier disk that formed around the progenitor star. Existing theoretical understanding will be applied to these new unique circumstances to learn more about the properties of planetary systems around evolved intermediate-mass stars. The PI and his team will model the fragmentation and destruction of asteroid bodies within the debris disks, and will derive predicted observational signatures that can be compared to existing observations of white dwarf debris disks. The PI will train and mentor a graduate student in research, involve undergraduate students in research, and develop movies for the general public illustrating the physics of planets around white dwarfs.Global time-dependent models for the evolution of both gaseous and solid debris disks around white dwarfs will be developed and compared with observations. The team will also explore the origin of eccentric distortions in the disks of metallic gas, and the condensation of metallic gas onto the solid particles. They will also explore possible role of electromagnetic effects on the disk evolution.

这是研究小行星带和碎屑盘的奖励，以便更好地了解行星系统的一般性质。白矮人是在低质量恒星生命的尽头产生的非常密集的恒星残余物，主要由电子脱位物质组成。绕着祖先恒星形成的早期磁盘，绕着白矮人旋转的任何碎屑盘或行星系统都可以幸存。 现有的理论理解将应用于这些新的独特情况，以更多地了解围绕进化的中间质量恒星的行星系统的性质。 PI和他的团队将建模碎片盘中小行星物体的碎片和破坏，并将得出预测的观察性特征，可以将其与现有的白矮碎片盘的现有观察结果进行比较。 PI将培训和指导研究研究生，参与研究生，并为公众开发电影，以说明白矮人周围的行星物理学。Global时间依赖性模型，以发展白矮人周围的气态和固体碎片磁盘的演变，并与观察相比。 该团队还将探索金属气体磁盘中偏心畸变的起源，并将金属气体的缩合到固体颗粒上。 他们还将探索电磁效应对磁盘演化的可能作用。