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首页> 外文期刊>The Astrophysical journal >ATMOSPHERIC DYNAMICS OF SHORT-PERIOD EXTRASOLAR GAS GIANT PLANETS. I. DEPENDENCE OF NIGHTSIDE TEMPERATURE ON OPACITY
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ATMOSPHERIC DYNAMICS OF SHORT-PERIOD EXTRASOLAR GAS GIANT PLANETS. I. DEPENDENCE OF NIGHTSIDE TEMPERATURE ON OPACITY

机译：短周期超大型天然气巨大大气的大气动力学。一，夜间温度与透光率的关系

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More than two dozen short-period Jupiter-mass gas giant planets have been discovered around nearby solar-type stars in recent years, several of which undergo transits, making them ideal for the detection and characterization of their atmospheres. Here we adopt a three-dimensional radiative hydrodynamical numerical scheme to simulate atmospheric circulation on close-in gas giant planets. In contrast to the conventional GCM and shallow water algorithms, this method does not assume quasi-hydrostatic equilibrium, and it approximates radiation transfer from optically thin to thick regions with flux-limited diffusion. In the first paper of this series, we consider synchronously spinning gas giants. We show that a full three-dimensional treatment, coupled with rotationally modified flows and an accurate treatment of radiation, yields a clear temperature transition at the terminator. Based on a series of numerical simulations with varying opacities, we show that the nightside temperature is a strong indicator of the opacity of the planetary atmosphere. Planetary atmospheres that maintain large interstellar opacities will exhibit large day-night temperature differences, while planets with reduced atmospheric opacities due to extensive grain growth and sedimentation will exhibit much more uniform temperatures throughout their photospheres. In addition to numerical results, we present a four-zone analytic approximation to explain this dependence.
机译：近年来，在附近的太阳型恒星周围发现了超过十二个短周期的木星气巨行星，其中一些经历了过境，使其成为探测和表征其大气的理想选择。在这里，我们采用三维辐射流体动力学数值方案来模拟近距离气体巨行星上的大气环流。与传统的GCM和浅水算法相比，此方法不假定拟静水力平衡，它近似地将辐射从光学上薄的区域传输到具有通量受限扩散的厚区域。在本系列的第一篇文章中，我们考虑同步旋转的天然气巨头。我们表明，完整的三维处理，再加上旋转修改后的流量和辐射的精确处理，可在终止器处产生清晰的温度变化。基于一系列具有不同浑浊度的数值模拟，我们表明，夜晚的温度是行星大气不透明度的有力指标。维持较大的星际不透明性的行星大气将表现出较大的昼夜温差，而由于大量的谷物生长和沉积而使大气不透明性降低的行星将在整个光球中表现出更为均匀的温度。除了数值结果外，我们还提出了四区域解析近似来解释这种依赖性。

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