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arXiv 1704.00539astro-ph.EP
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来自一组热木星大气的三维数值试验的结果

Results from a set of three-dimensional numerical experiments of a hot Jupiter atmosphere

N. J. Mayne, F. Debras, I. Baraffe, John Thuburn, David S. Amundsen, David M. Acreman, Chris Smith, Matthew K. Browning, James Manners, Nigel Wood

摘要:

我们提出了一个热木星大气层的模拟,名义上是基于HD 209458b,旨在探索深层大气的演变,以及纬向流或射流的加速。我们发现超旋转赤道急流的发生对各种参数的变化是鲁棒的,并且在很长的时间尺度上,即使在没有强烈的内部或底部边界阻力的情况下。这种喷流只在一个模拟中减少,在那里我们强烈地迫使深大气层赤道到极点的温度梯度在很长的时间尺度。最后,虽然我们大气中的涡流动量通量与潮汐锁定行星上加速喷流的机制相似,但情况似乎更复杂。我们提出了一个射流驱动的涡动量输运和平均流的组合的初步证据。

英文摘要:

We present highlights from a large set of simulations of a hot Jupiter atmosphere, nominally based on HD 209458b, aimed at exploring both the evolution of the deep atmosphere, and the acceleration of the zonal flow or jet. We find the occurrence of a super-rotating equatorial jet is robust to changes in various parameters, and over long timescales, even in the absence of strong inner or bottom boundary drag. This jet is diminished in one simulation only, where we strongly force the deep atmosphere equator-to-pole temperature gradient over long timescales. Finally, although the eddy momentum fluxes in our atmosphere show similarities with the proposed mechanism for accelerating jets on tidally-locked planets, the picture appears more complex. We present tentative evidence for a jet driven by a combination of eddy momentum transport and mean flow.

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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