Understanding formation and properties of gravitational waves events from galactic nuclei

了解星系核引力波事件的形成和特性

• 批准号: 21K13914
• 负责人: Trani Alessandro
• 金额: $ 3万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Early-Career Scientists
• 财政年份: 2021
• 资助国家: 日本
• 起止时间: 2021-04-01 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21K13914/
• 关键词: Gravitational waves; Dynamics; Three-body problem; Gravitationa dynamics; Black hole physics; Galactic nuclei; Stellar dynamics

The first gravitational wave event observed by LIGO-Virgo-Kagra has opened a new observable window on the universe. However, the origin of gravitational wave events is still unknown. We investigated several formation pathways for gravitational wave formation events, which involve few-body interactions and binary stellar evolution processes. In Trani et al. 2022a, we studied how hierarchical triple stars formed in star cluster can produce gravitational wave events from black hole binaries, black hole - neutron stars and black hole - white dwarf binaries. We calculated merger properties and rates, and compared it with the current estimates from LIGO-Virgo-Kagra. In Trani et al. 2022b, we instead proposed a novel way to model the common envelope evolution in binary stars, which is a crucial phase in binary stellar evolution that is necessary to produce gravitational wave events. Further study accomplished in this fiscal year related to the stability of triple systems, which can affect the formation of merging compact binaries. Finally, we have implemented a novel way to model three-body interactions of compact objects in galactic nuclei. We are currently performing a study on: (1) the outcome properties of three-body encounters in galactic nuclei, to better understand how they differ with respect to isolated encounters. This enabled us to analyze the eccentricity of black hole mergers, which may enable us to distinguish from other mergers. (2) The interplay between Kozai-Lidov oscillations and encounters on compact binaries in galactic nuclei.

Ligo-Virgo-Kagra观察到的第一个引力波事件为宇宙打开了一个新的可观察窗口。但是，重力波事件的起源仍然未知。我们研究了引力波形事件的几种形成途径，这些途径涉及几种体相互作用和二元恒星进化过程。在Trani等。 2022a，我们研究了在星团中形成的层次三星星如何从黑洞二进制室，黑洞 - 中子星和黑洞 - 白矮人二进制文件中产生引力波事件。我们计算了合并属性和速率，并将其与Ligo-Virgo-Kagra的当前估计值进行了比较。在Trani等。 2022b，我们提出了一种模拟二进制恒星中常见包膜演化的新方法，这是产生引力波事件所必需的二元恒星进化中的一个关键阶段。在本财政年度完成的进一步研究与三重系统的稳定性有关，这可能会影响合并紧凑型二进制文件的形成。最后，我们实施了一种新颖的方式，用于模拟银河核中紧凑型物体的三体相互作用。我们目前正在进行一项研究：（1）银河核中三体相遇的结果特性，以更好地理解它们在孤立的相遇方面的差异。这使我们能够分析黑洞合并的偏心率，这可能使我们能够与其他合并区分开。 （2）Kozai-Lidov振荡与银河系核中紧凑型二进制的相互作用之间的相互作用。

项目成果

TSUNAMI: a regularized code for planet and black hole dynamics

海啸：行星和黑洞动力学的规范化代码

• 发表时间: 2023
• 作者: Trani A A;Tanikawa A;Fujii M S;Leigh N W C;Kumamoto J;A.A.Trani
• 通讯作者: A.A.Trani

Merger Rate Density of Binary Black Holes through Isolated Population I, II, III and Extremely Metal-poor Binary Star Evolution

• DOI: 10.3847/1538-4357/ac4247
• 发表时间: 2021-10
• 期刊: The Astrophysical Journal
• 作者: A. Tanikawa;T. Yoshida;T. Kinugawa;A. Trani;T. Hosokawa;H. Susa;K. Omukai

Gravitational waves from triple interactions

三重相互作用产生的引力波

• 发表时间: 2021
• 作者: Trani A A;Tanikawa A;Fujii M S;Leigh N W C;Kumamoto J;A.A.Trani;A.A.Trani;A.A.Trani;Alessandro Trani;Alessandro Trani;Alessandro Trani;Alessandro Trani
• 通讯作者: Alessandro Trani

In the land of N=3: Modeling triple gravitational interactions with TSUNAMI and OKINAMI

在 N=3 的土地上：模拟与海啸和冲波的三重引力相互作用

• 发表时间: 2021
• 作者: Trani A A;Tanikawa A;Fujii M S;Leigh N W C;Kumamoto J;A.A.Trani;A.A.Trani;A.A.Trani;Alessandro Trani;Alessandro Trani;Alessandro Trani;Alessandro Trani;Alessandro Trani
• 通讯作者: Alessandro Trani

Testing the flux-based statistical prediction of the three-body problem

测试三体问题基于通量的统计预测

• DOI: 10.1093/mnras/stab1689
• 发表时间: 2021
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Manwadkar Viraj;Kol Barak;Trani Alessandro A;Leigh Nathan W C
• 通讯作者: Leigh Nathan W C