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.

该奖项旨在研究围绕白矮星运行的小行星带和碎片盘，以便更好地了解行星系统的一般性质。白矮星是一颗低质量恒星生命结束时产生的密度很高的恒星残骸，主要由电子简并物质组成。任何围绕白矮星运行的碎片盘或行星系统都被认为是早期形成的圆盘在其前身恒星周围幸存下来的。现有的理论知识将应用于这些新的独特环境，以了解更多关于演化中质量恒星周围行星系统的特性。PI和他的团队将模拟碎片盘内小行星体的破碎和破坏，并将得出预测的观测特征，这些特征可以与现有的白矮星碎片盘观测结果进行比较。PI将培训和指导一名研究生进行研究，让本科生参与研究，并为公众制作电影，说明白矮星周围行星的物理学。将开发白矮星周围气体和固体碎片盘演化的全球时间依赖模型，并与观测结果进行比较。该团队还将探索金属气体圆盘偏心扭曲的起源，以及金属气体在固体颗粒上的冷凝。他们还将探索电磁效应在圆盘演化中的可能作用。