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arXiv 1004.2702astro-ph.EP
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恒星活动与热木星发射谱的相关性

A Correlation Between Stellar Activity and Hot Jupiter Emission Spectra

Heather A. Knutson, Andrew W. Howard, Howard Isaacson

摘要:

我们提出的证据之间的相关性观测到的热木星发射光谱和活动水平的主机使用钙II H & K发射谱线测量。我们发现,行星的昼面发射光谱是很好地描述了标准的一维大气模型与水的吸收(HD 189733,TrES-1,TrES-3,WASP-4)的轨道色球活跃的恒星,而行星的发射光谱是一致的存在一个强大的高空温度反演和水的发射轨道安静的恒星。我们估计,活跃的G和K星的莱曼α通量通常是4-7倍,比安静的恒星具有类似的光谱型,并提出,增加的紫外线通量接收到的行星轨道活跃的恒星破坏的化合物负责形成所观察到的温度反演。在本文中,我们还得出了一个模型独立的方法来区分这两种大气类型使用的二次日食深度测量的3.6和4.5微米波段的斯皮策太空望远镜,并认为,所观察到的相关性是独立的倒置/非倒置的范式分类热木星大气。

英文摘要:

We present evidence for a correlation between the observed properties of hot Jupiter emission spectra and the activity levels of the host stars measured using Ca II H & K emission lines. We find that planets with dayside emission spectra that are well-described by standard 1D atmosphere models with water in absorption (HD 189733, TrES-1, TrES-3, WASP-4) orbit chromospherically active stars, while planets with emission spectra that are consistent with the presence of a strong high-altitude temperature inversion and water in emission orbit quieter stars. We estimate that active G and K stars have Lyman alpha fluxes that are typically a factor of 4-7 times higher than quiet stars with analogous spectral types, and propose that the increased UV flux received by planets orbiting active stars destroys the compounds responsible for the formation of the observed temperature inversions. In this paper we also derive a model-independent method for differentiating between these two atmosphere types using the secondary eclipse depths measured in the 3.6 and 4.5 micron bands on the Spitzer Space Telescope, and argue that the observed correlation is independent of the inverted/non-inverted paradigm for classifying hot Jupiter atmospheres.

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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