Evolution of Compact Binaries and Related Objects

紧凑二进制文件和相关对象的演变

• 批准号: RGPIN-2020-06967
• 负责人: Nelson, Lorne
• 金额: $ 1.75万
• 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: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=762543
• 关键词: Evolution; Compact; Binaries; Related; Objects

Some of the most astrophysically interesting phenomena are associated with binary and multiple star systems containing degenerate and/or compact objects. They span the gamut from high energy ?-ray bursts to the most luminous explosions observed in the Universe. The properties of many of these systems can only be explained if the stars interacted by exchanging mass during their prior evolution. With the advent of gravitational wave astronomy (LIGO and LISA in the 2030s), the study of the evolution of stars in binaries, especially ultracompact binaries, has taken on a new urgency. The primary objective of the proposed research is to make significant contributions to the creation of a unified picture for the formation, evolution, and final states of various types of compact binaries and related systems. This includes an improved understanding of the inter-relationships between Cataclysmic Variables (CVs), Contact Binaries, Algol-like Binaries, Low-Mass X-ray Binaries, Millisecond Pulsars, and Type Ia Supernovae. These objectives will be carried out by using sophisticated stellar evolution codes such as MESA to determine if, for instance, CVs could have evolved from much more massive progenitor stars. By analyzing the chemical abundances observed in these systems we believe that we will be able to answer this question. We will also look for more unusual evolutionary paths that might produce one or more degenerate stars (including EL CVn-type binaries). The determination of the progenitors of Type Ia SNe is particularly problematic since astronomers treat them as "standardizable candles" and thus rely on them to determine distances and other parameters on a cosmic scale. We will revisit the Type Ia SN progenitor problem by using two hydrodynamic codes to determine which types of companion stars are admissible. We will also look at the intrinsically related problem of under-energetic events (Type Iax) to determine how much ablation of the putative companions occurs. Another major objective of our work is to discover and analyze targets that are closely related to the ones described above (as well as exoplanets) as a follow-up to large-scale surveys that are either ongoing or are imminent. This includes the analysis of data products from Kepler, K2, and especially TESS, but also from SDSS, Pan-STARRS, LSST, and the JWST. The ancillary science associated with these discoveries is ground-breaking. Our group is well poised to take advantage of the multitude of new data that will be forthcoming.

一些最有趣的天体物理现象与含有简并和/或致密物体的双星和多星系统有关。它们的范围从高能射线爆发到宇宙中观察到的最明亮的爆炸。只有当恒星在其先前的演化过程中通过交换质量进行相互作用时，才能解释其中许多系统的性质。随着引力波天文学(LIGO和LISA在20世纪30年代)的出现，双星，特别是超致密双星的演化研究具有了新的紧迫性。拟议研究的主要目标是为建立各种类型的致密双星和相关系统的形成、演化和最终状态的统一图景做出重大贡献。这包括对激变变星(CV)、接触双星、类大卫二双星、低质量X射线双星、毫秒脉冲星和Ia型超新星之间相互关系的更好理解。这些目标将通过使用复杂的恒星演化代码(如MESA)来实现，以确定CVs是否可能是从质量更大的祖先恒星进化而来的。通过分析在这些系统中观察到的化学丰度，我们相信我们将能够回答这个问题。我们还将寻找更多不寻常的演化路径，可能会产生一颗或多颗简并恒星(包括El CVn类型的双星)。确定Ia型SNE的前身尤其有问题，因为天文学家将它们视为“可标准化的蜡烛”，因此依赖它们来确定距离和宇宙尺度上的其他参数。我们将通过使用两个流体动力学代码来确定哪些类型的伴星是可接受的，从而重新讨论Ia型SN先驱问题。我们还将研究低能事件(Iax类型)的内在关联问题，以确定假定的伴星发生了多少消融。我们工作的另一个主要目标是发现和分析与上述目标密切相关的目标(以及系外行星)，作为正在进行或即将进行的大规模调查的后续行动。这包括对开普勒、K2，特别是TESS的数据产品的分析，也包括对SDSS、泛星、LSST和JWST的数据产品的分析。与这些发现相关的辅助科学是开创性的。我们的团队已经做好了充分的准备，可以利用即将到来的大量新数据。