Modelling star formation and gas dynamics in galactic nuclei: the role of non-equilibrium chemistry

模拟星系核中的恒星形成和气体动力学：非平衡化学的作用

• 批准号: 17F17764
• 负责人: 藤井 通子
• 金额: $ 1.47万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2017
• 资助国家: 日本
• 起止时间: 2017-11-10 至 2020-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17F17764/
• 关键词: black hole; black hole dynamics; numerical simulation; galactic center; galactic nuclei

The few-body problem is one of the oldest problems in astronomy and classical mechanics. Yet, its simplest instance, the three-body problem, has no general analytical solution and only a partial statistical solution has been achieved so far. With the birth of gravitational wave astronomy and the rise in exoplanet discoveries, the three-body problem is becoming central to modern astrophysics. We have studied how three-body encounters can perturb compact binaries in orbit around supermassive black holes, leading to an increase of gravitational wave merger rates in galactic nuclei. Binaries coalescing via this mechanism can have a unique gravitational wave emission pattern that will be identifiable by LISA and DECIGO. Revealing the details of this mechanism is of paramount importance in order to understand the origin of observed gravitational wave events. In addition, we have been exploring the role of the secular and non-secular few-body interactions in the migration of giant planets hosting exomoons. The moons can regulate the migration of giant planets in binaries and thus explain the presence (or lack thereof) of exomoons around short-period planets.

少体问题是天文学和经典力学中最古老的问题之一。然而，它的最简单的例子，三体问题，没有一般的解析解，到目前为止只取得了部分的统计解。随着引力波天文学的诞生和系外行星发现的增加，三体问题正成为现代天体物理学的核心。我们已经研究了三体碰撞如何扰乱超大质量黑洞周围轨道上的致密双星，从而导致星系核中引力波合并率的增加。通过这种机制合并的双星可以有一个独特的引力波发射模式，将被LISA和DECIGO识别。揭示这一机制的细节对于理解观测到的引力波事件的起源至关重要。此外，我们一直在探索世俗和非世俗的少体相互作用在拥有系外卫星的巨大行星迁移中的作用。卫星可以调节双星中巨行星的迁移，从而解释了短周期行星周围系外卫星的存在（或缺乏）。

项目成果

Northwestern University(米国)

西北大学（美国）

Can a Hot Jupiter host exomoons?

热木星可以托管系外卫星吗？

• 发表时间: 2019
• 作者: X. Zhao;N. Liang;M. Teramoto;J. Zeng;B.M. Sumsudin;Trani Alessandro A.;Trani Alessandro A.
• 通讯作者: Trani Alessandro A.

TSUNAMI: a fast and accurate fewbody code for planetary dynamics with tidal interactions

海啸：快速、准确的少体代码，用于潮汐相互作用的行星动力学

• 发表时间: 2018
• 作者: Trani;Alessandro A
• 通讯作者: Alessandro A

Coupling codes with the Astrophysical Multipurpose Software Environment

将代码与天体物理多用途软件环境耦合

• 发表时间: 2018
• 作者: Trani;Alessandro A
• 通讯作者: Alessandro A

Universidad de Concepcion(チリ)

康塞普西翁大学（智利）