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arXiv 1003.4818astro-ph.EP
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太阳系外热行星上的重力波:I.传播和与背景的相互作用

Gravity Waves on Hot Extrasolar Planets: I. Propagation and Interaction with the Background

Chris Watkins, James Y-K. Cho

摘要:

我们研究重力波或g模式对热的太阳系外行星的影响。这些行星预计拥有稳定的分层大气,支持重力波。在本文中,我们回顾了控制重力波线性动力学的方程的推导,并以HD 209458 b为例描述了其在热太阳系外行星中的应用。我们发现,重力波可以表现出广泛的行为,即使是一个单一的大气剖面。波浪可以显著地加速或减速背景平均流,这取决于波浪相位和平均流速度之间的差异。此外,波可以提供显着的加热(每行星旋转~100至~1000 K),特别是对从激发区域到大约10个标度高度以上的大气区域。此外,通过水平传播,重力波提供了一种机制,将动量和热量从潮汐锁定行星的昼侧传输到其夜侧。我们讨论的工作,需要进行纳入这些影响,在目前的大气模型的太阳系外行星。

英文摘要:

We study the effects of gravity waves, or g-modes, on hot extrasolar planets. These planets are expected to possess stably-stratified atmospheres, which support gravity waves. In this paper, we review the derivation of the equation that governs the linear dynamics of gravity waves and describe its application to a hot extrasolar planet, using HD209458 b as a generic example. We find that gravity waves can exhibit a wide range of behaviors, even for a single atmospheric profile. The waves can significantly accelerate or decelerate the background mean flow, depending on the difference between the wave phase and mean flow speeds. In addition, the waves can provide significant heating (~100 to ~1000 K per planetary rotation), especially to the region of the atmosphere above about 10 scale heights from the excitation region. Furthermore, by propagating horizontally, gravity waves provide a mechanism for transporting momentum and heat from the dayside of a tidally locked planet to its nightside. We discuss work that needs to be undertaken to incorporate these effects in current atmosphere models of extrasolar planets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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