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.

拟议的研究集中在恒星天体物理学的两个不同但内在相关的领域：（1） 包含白色矮星、中子星/中子星和黑洞的相互作用双星;以及（2）低质量恒星、棕矮星和系外行星。虽然将探索新的研究途径（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，已经开发了一套大型代码，用于使用我们的HPC基础设施进行数值模拟）。预计拟议的研究将对超新星研究、CV、LMXB以及亚恒星物体和系外行星的研究产生重大影响。 (1)包含坍缩恒星的双星系统表现出丰富多样的天体物理现象。包含吸积白色矮星（激变变星[CV]）的相互作用双星与超软X射线源（SXS）有着相同的谱系，因此可能是Ia型超新星（SNe）的祖先。由于Ia型超新星被用作宇宙学标准烛光，它们是测量宇宙学参数的关键工具，从而使我们能够推断宇宙的演化。我们将试图确定这些重要的宇宙距离指标的前身。 (2)我们还建议调查其宿主恒星的太阳质量的系外行星的照射。这些所谓的“热彗星”的特点是接近圆形，接近轨道（轨道周期小于7天）。观测研究开始揭示有关这些物体性质的更多细节，我们计划对加热对其长期演化的影响进行建模。了解这些热木星的长期演化对于了解行星系统的动态演化至关重要。