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Accretion discs, Astrophysical dynamos, Planetary formation, Exoplanet systems, Solar and stellar phenomena and non equilibrium physical processes

吸积盘、天体物理发电机、行星形成、系外行星系统、太阳和恒星现象以及非平衡物理过程

基本信息

批准号：
ST/G002584/1
负责人：
John Papaloizou
金额：
$ 214.79万
依托单位：
University of Cambridge
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2009
资助国家：
英国
起止时间：
2009 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=ST%2FG002584%2F1
关键词：
Accretion discs Astrophysical dynamos Planetary

项目摘要

This is a proposal to investigate a number of phenomena: The first is astrophysical discs. These objects are common, being found in close binary systems, active galactic nuclei, and around newly formed stars. There they provide the environment for planet formation. We propose in depth studies of these objects to establish the physical conditions that apply, for instance the degree of turbulence, the magnetic field strength, the amount of anomalous transport and whether the discs remain circular. We then intend to investigate the effects of this environment on forming planets and their orbital migration. If inward, this natuarlly leads on to a consideration of tidal interaction with the central star which may cause heating and inflation, which appears to be common, or even coallescence with the central star. Such a study requires a fully nonlinear tidal theory for general orbits that we intend to develop. The second investigation relates to solar type stars which many extrasolar planets orbit. It accordingly connects with the investigation of tidal interaction. This investigation is directed towards understanding the behaviour of the solar dynamo and how magnetic flux emerges at the surface. This can be determined from Hinode obsrvations of active regions. Both analytic and numerical studies of dynamo processes will be undertaken together with improved modeling of the solar tachocline which may play an important role in generating toroidal field that rises buoyantly to the surface.

这是一个研究一些现象的建议：第一个是天体物理圆盘。这些天体很常见，存在于近距离双星系统、活动星系核和新形成的恒星周围。它们为行星的形成提供了环境。我们建议对这些物体进行深入研究，以确定适用的物理条件，例如湍流程度，磁场强度，异常传输量以及圆盘是否保持圆形。然后，我们打算研究这种环境对形成行星及其轨道迁移的影响。如果向内，这自然会导致考虑与中央星星的潮汐相互作用，这可能会导致加热和膨胀，这似乎是常见的，甚至与中央星星合并。这样的研究需要一个完全非线性潮汐理论的一般轨道，我们打算发展。第二项研究涉及太阳型恒星，许多太阳系外行星绕其运行。因此，它与潮汐相互作用的研究有关。这项调查旨在了解太阳发电机的行为以及磁通量如何出现在表面。这可以从有源区的Hinode观测值确定。发电机过程的分析和数值研究将与改进的太阳速跃层模型一起进行，这可能在产生垂直上升到表面的环形场方面发挥重要作用。