THEORETICAL EMISSION SPECTRA OF ATMOSPHERES OF HOT ROCKY SUPER-EARTHS
THEORETICAL EMISSION SPECTRA OF ATMOSPHERES OF HOT ROCKY SUPER-EARTHS
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DOI：
10.1088/0004-637x/801/2/144
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发表时间：
2015-01
期刊：
影响因子：
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通讯作者：
Y. Ito;M. Ikoma;H. Kawahara;H. Nagahara;Y. Kawashima;T. Nakamoto
中科院分区：
文献类型：
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作者：
Y. Ito;M. Ikoma;H. Kawahara;H. Nagahara;Y. Kawashima;T. Nakamoto
受最近探测到凌日高密度超级地球的启发，我们探索了非常靠近其主恒星运行的热岩石超级地球的可探测性。在一个足够热的环境中，它们的岩石表面会熔化，它们的大气层将由来自岩浆海洋的气体组成。在这项研究中，我们研究了与下面的岩浆海洋处于气体/熔体平衡的大气的辐射特性。我们的平衡计算得出 Na、K、Fe、Si、SiO、O 和 O2 作为主要大气物质。我们编译了文献中提供的这些物质的辐射吸收线数据，并计算了它们在 0.1–100 μm 波长范围内的吸收不透明度。利用它们，我们整合了大气的热结构。然后，我们发现由于 SiO 的紫外吸收，大气中发生了逆温现象。此外，我们计算了次食期间行星与恒星发射通量的比率，发现斯皮策可检测到 4 μm 处 SiO 引起的显着发射特征，以及近期太空望远镜可检测到 10 和 100 μm 处的 SiO2 引起的显着发射特征。
Motivated by recent detection of transiting high-density super-Earths, we explore the detectability of hot rocky super-Earths orbiting very close to their host stars. In an environment hot enough for their rocky surfaces to be molten, they would have an atmosphere composed of gas species from the magma oceans. In this study, we investigate the radiative properties of the atmosphere that is in gas/melt equilibrium with the underlying magma ocean. Our equilibrium calculations yield Na, K, Fe, Si, SiO, O, and O2 as the major atmospheric species. We compile the radiative absorption line data of those species available in the literature and calculate their absorption opacities in the wavelength region of 0.1–100 μm. Using them, we integrate the thermal structure of the atmosphere. Then, we find that thermal inversion occurs in the atmosphere because of the UV absorption by SiO. In addition, we calculate the ratio of the planetary to stellar emission fluxes during secondary eclipse, and we find prominent emission features induced by SiO at 4 μm detectable by Spitzer, and those at 10 and 100 μm detectable by near-future space telescopes.