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观测到的第一个引力波事件打开了一个新的宇宙观测窗口。然而，引力波事件的起源仍然是未知的。我们研究了几种引力波形成事件的形成途径，包括少体相互作用和双星演化过程。在Trani et al. 2022a中，我们研究了在星团中形成的分层三重恒星如何从黑洞双星、黑洞-中子星和黑洞-白矮星双星中产生引力波事件。我们计算了合并的性质和速率，并将其与LIGO-Virgo-Kagra目前的估计进行了比较。在Trani et al. 2022b中，我们提出了一种新的方法来模拟双星的共同包层演化，这是双星演化的关键阶段，是产生引力波事件所必需的。本财政年度完成的进一步研究涉及三重系统的稳定性，这可能会影响合并紧密双星的形成。最后，我们实现了一种新的方法来模拟星系核中致密物体的三体相互作用。我们目前正在进行一项研究：(1)星系核中三体碰撞的结果特性，以更好地了解它们与孤立碰撞的不同之处。这使我们能够分析黑洞合并的离心率，这可能使我们能够与其他合并区分开来。(2)星系核致密双星的Kozai-Lidov振荡与相遇的相互作用。

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

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

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

Tidal Disruption Events by Compact Supermassive Black Hole Binaries

致密超大质量黑洞双星的潮汐破坏事件

• DOI: 10.1093/mnras/stac1987
• 发表时间: 2022
• 期刊: MNRAS
• 作者: T.Ryu ;A.A.Trani;N.W.C.Leigh
• 通讯作者: N.W.C.Leigh