Numerical Modeling and Population Synthesis of Single and Binary Stars: From Compact Objects to Exoplanets

单星和双星的数值模拟和星群综合：从致密天体到系外行星

• 批准号: 42936-2013
• 负责人: Nelson, Lorne
• 金额: $ 1.31万
• 依托单位: Bishop's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=568909
• 关键词: Numerical; Modeling; Population; Synthesis; Single

The proposed research focuses on two diverse yet intrinsically related areas of stellar astrophysics: (1) interacting binaries containing white dwarfs, neutron stars/pulsars and black holes; and, (2) low-mass stars, brown dwarfs, and exoplanets. While new avenues of investigation will be explored (for example, the irradiation of stars and exoplanets), we will take advantage of the significant investments that have already been made for continuing projects (e.g., a large suite of codes that have been developed to carry out numerical simulations using our HPC infrastructure). It is expected that the proposed research will have a significant impact on the areas of supernova research, CVs, LMXBs, and on the study of substellar objects and exoplanets. (1) Binary systems containing collapsed stars exhibit a rich variety of astrophysical phenomena. Interacting binaries containing accreting white dwarfs (Cataclysmic Variables [CVs]) share the same lineage as supersoft X-ray sources (SXSs) and thus could be the progenitors of Type Ia supernovae (SNe). Because Type Ia SNe are used as cosmological standard candles, they are the key tools to measure cosmological parameters thereby allowing us to infer the evolution of the universe. We will try to definitively establish the progenitors of these important cosmic distance indicators. (2) We also propose to investigate the irradiation of Jupiter-mass exoplanets by their host stars. These so-called 'Hot Jupiters' are characterized by nearly circular, close orbits (orbital periods of less than 7 days). Observational research is starting to reveal more details about the properties of these objects and we plan to model the effects of the heating on their long-term evolution. Understanding the long-term evolution of these Hot Jupiters is of central importance to understanding the dynamical evolution of planetary systems.

拟议的研究重点是恒星天体物理学的两个不同但本质上相关的领域：（1） 含有白矮人，中子星/脉冲星和黑洞的相互作用的二进制室； （2）低质量恒星，棕色矮人和系外行星。尽管将探索新的调查途径（例如，恒星和系外行星的辐射），但我们将利用已经为持续项目进行的重大投资（例如，已经开发出一系列用于使用我们的HPC基础架构进行数值模拟的代码套件）。预计拟议的研究将对超新星研究，CVS，LMXB的领域产生重大影响，以及对替代物体和外部球星的研究。 （1）含有倒塌星的二元系统表现出各种天体物理现象。相互作用的二进制文件含有积​​聚白矮人（灾难性变量[CVS]）具有与SuperSoft X射线源（SXSS）相同的谱系，因此可以是IA型超新星（SNE）的祖细胞。因为IA SNE类型被用作宇宙学标准蜡烛，因此它们是测量宇宙参数的关键工具，从而使我们能够推断宇宙的演变。我们将尝试确定建立这些重要的宇宙距离指标的祖细胞。 （2）我们还建议研究其宿主恒星对木星质量系外行星的照射。这些所谓的“热木星”的特征是几乎圆形的近轨道（轨道时期少于7天）。观察性研究开始揭示有关这些物体特性的更多细节，我们计划对加热对其长期演变的影响进行建模。了解这些热木星的长期演变对于理解行星系统的动态演变至关重要。