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: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=718580
• 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.

一些最有趣的现象与包含退化和/或紧凑物体的二元和多个星系有关。它们跨越了从高能量射线爆发到宇宙中观察到的最发光的爆炸。仅当恒星通过质量在先前的演变过程中交换质量相互作用时，才能解释其中许多系统的性质。随着引力波天文学的发展（2030年代的Ligo和Lisa），对二进制恒星的进化，尤其是超级型二进制的研究，已经采取了新的迫切性。 拟议研究的主要目的是为创建各种紧凑型二进制组和相关系统的形成，进化和最终状态的统一图片做出重大贡献。这包括对灾难性变量（CVS），接触二元，类似Algol的二进制文件，低质量X射线二进制文件，毫秒脉冲星和IA Supernovae之间的相互关系的了解。这些目标将通过使用复杂的恒星演化代码（例如MESA）来确定例如CVS是否可以从更大的祖细胞星中演变而成。通过分析这些系统中观察到的化学丰度，我们认为我们将能够回答这个问题。我们还将寻找可能产生一个或多个退化恒星（包括El CVN型二进制）的更异常的进化路径。 由于天文学家将其视为“标准蜡烛”，因此确定IA SNE型祖细胞的确定尤其有问题，因此依靠它们以宇宙规模确定距离和其他参数。我们将通过使用两个流体动力代码来确定哪些类型的伴侣恒星可接受，我们将重新审视IA型SN祖细胞问题。我们还将查看能源不足事件（类型IAX）本质上相关的问题，以确定发生了多少推定伴侣的消融。 我们工作的另一个主要目的是发现和分析与上面描述的目标（以及系外行星）密切相关的目标，作为正在进行或迫在眉睫的大规模调查的后续行动。这包括对Kepler，K2，尤其是TESS的数据产品的分析，还包括SDSS，Pan-Starrs，LSST和JWST的分析。与这些发现相关的辅助科学是开创性的。我们的小组有毒化的毒品，可以利用即将到来的大量新数据。