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.

在过去的20年里，一些太阳系外行星被发现，它们的轨道非常接近它们的主星星。行星和星星之间的潮汐相互作用可能会导致星星表面的振荡。这种振荡会产生一个观测信号，可能被误解为是由于一个额外的行星。该项目旨在计算各种行星的潮汐振荡特征，并研究这些特征是否会影响对行星的间接观测，该项目将侧重于A型恒星，因为它们具有辐射包层。在这样一颗星星中，由一颗紧密的行星伴星激发的引力模在表面的振幅比在一颗质量较小、有对流包层的星星中的振幅大。A型星星被一个近距离行星强迫的重力模式将被计算出来，然后这个信号将被添加到由星星围绕系统质心运动产生的信号中。给定这个总信号，将计算是否可以恢复星星周围存在的行星的特征，或者是否引入了错误的信息。

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