Tidal interaction between an extrasolar planet and its host star

太阳系外行星与其主恒星之间的潮汐相互作用

• 批准号: 1733992
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1733992
• 关键词: Tidal; interaction; between; extrasolar; planet

Some of the extrasolar planets that have been detected in the last 20 years are on an orbit which is very close to their host star. Tidal interaction between the planet and the star may then induce oscillations at the surface of the star. Such oscillations would produce an observational signal that could be misinterpreted as being due to an additional planet. This project aims at calculating the characteristics of those tidal oscillations for a variety of planets, and at studying whether they could affect the indirect observation of planets.The project will focus on A-type stars, as they have a radiative envelope. Gravity modes excited in such a star by a close planetary companion have a larger amplitude at the surface than in a less massive star with a convective envelope. The gravity modes forced in a A-type star by a close planet will be calculated, and this signal will then be added to that produced by the motion of the star around the centre of mass of the system. Given this total signal, it will be calculated whether the characteristics of the planet present around the star can be recovered, or whether false information is induced.

在过去20年中检测到的一些外星星球在轨道上非常接近他们的宿主恒星。然后，行星和恒星之间的潮汐相互作用可能会诱导恒星表面的振荡。这样的振荡会产生一个观察信号，这可能会被误解是由于额外的行星。该项目旨在计算各种行星的潮汐振荡的特征，并研究它们是否可以影响行星的间接观察。该项目将重点放在A型恒星上，因为它们具有辐射性信封。与具有对流信封的巨大恒星相比，在表面上，在这样的恒星中激发的重力模式的幅度更大。将计算由近距离行星强制强制A型恒星中强制的重力模式，然后将该信号添加到由系统质量中心围绕系统质量中心围绕系统产生的信号。鉴于此总信号，将计算是否可以回收恒星周围存在的行星的特征，还是诱导错误信息。

项目成果

Non-adiabatic tidal oscillations induced by a planetary companion

由行星伴星引起的非绝热潮汐振荡

• DOI: 10.1093/mnras/stz2561
• 发表时间: 2019
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Bunting A