Internal gravity waves in magnetic stars

磁星中的内部重力波

• 批准号: 2602431
• 金额: --
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2602431
• 关键词: Internal; gravity; waves; magnetic; stars

Internal gravity waves (or g-modes) propagate in the radiation zones of stars, such as in the radiative core of the Sun. These waves can be excited in stars by turbulence in neighbouring convection zones, by fluid instabilities, or by gravitational tidal forcing due to a companion, such as a closely orbiting hot Jupiter. Stars such as the Sun are magnetised objects. For example, the solar radiation zone is believed to harbour a large-scale magnetic field, which is thought to explain the approximate solid body rotation of the core. However, the effects of magnetic fields on the propagation of gravity waves, and on their stability and dissipation has not been fully explored. This theoretical and computational project will focus on studying aspects of the effects of magnetic fields on gravity waves in stellar and planetary interiors. The goal is to understand the effects of magnetic fields on these waves, and to determine any astrophysical implications for gravity waves that are tidally-excited in exoplanet or close binary systems, as well as the in cores of red giant stars.

内部重力波（或g模式）在恒星的辐射区传播，例如在太阳的辐射核心。这些波可以在恒星中被邻近对流区的湍流、流体的不稳定性或伴星的引力潮汐强迫所激发，比如近距离轨道运行的热木星。像太阳这样的恒星是磁化的物体。例如，太阳辐射区被认为拥有一个大规模的磁场，这被认为可以解释地核的固体旋转。然而，磁场对重力波传播、稳定性和耗散的影响尚未得到充分的研究。这个理论和计算项目将重点研究磁场对恒星和行星内部重力波的影响。其目标是了解磁场对引力波的影响，并确定系外行星或近双星系统以及红巨星核心中潮汐激发的引力波的天体物理学含义。