适居行星Gliese 581 g的可居住性：来自地球动力学模型的结果
Habitability of the Goldilocks Planet Gliese 581g: Results from Geodynamic Models
摘要：
目的：2010年，发表了详细的观测结果，似乎表明格利泽581系统中的另一颗超级地球行星位于恒星气候宜居带的中间。这颗行星的质量被称为Gl 581 g，估计在3.1到4.3地球质量之间。在这项研究中，我们研究了基于先前使用的概念，探索其长期光合生物量生产的可能性，这已经被用来衡量关于超级地球Gl 581 c和Gl 581 d的生命的主要可能性的Gl 581 g的可居住性。方法：利用超地球热演化模型计算大气CO2的源汇。宜居带是由行星表面光合生物生产力的极限决定的。采用陆地/海洋覆盖率不同的模式。结果如下：水世界的最大适居时间跨度大约在0.14+/-0.015 AU，与Gl 581 g的实际位置相差仅几个百分点（取决于采用的恒星光度），但这一估计并不反映我们模型中固有的系统不确定性。因此，在我们的模型框架中，实现了一个几乎完美的金发位置。可居住性的存在被发现严重依赖于相对的行星大陆面积，如果Gl 581 g的海洋覆盖率相对较高，那么生命的可能性就会有相当大的优势。结论：我们的研究结果是朝着确定太阳系以外生命的可能性迈出的又一步，特别是关于超级地球行星，它们似乎比以前推测的更丰富。
英文摘要：
Aims: In 2010, detailed observations have been published that seem to indicate another super-Earth planet in the system of Gliese 581 located in the midst of the stellar climatological habitable zone. The mass of the planet, known as Gl 581g, has been estimated to be between 3.1 and 4.3 Earth masses. In this study, we investigate the habitability of Gl 581g based on a previously used concept that explores its long-term possibility of photosynthetic biomass production, which has already been used to gauge the principal possibility of life regarding the super-Earths Gl 581c and Gl 581d. Methods: A thermal evolution model for super-Earths is used to calculate the sources and sinks of atmospheric carbon dioxide. The habitable zone is determined by the limits of photosynthetic biological productivity on the planetary surface. Models with different ratios of land / ocean coverage are pursued. Results: The maximum time span for habitable conditions is attained for water worlds at a position of about 0.14+/-0.015 AU, which deviates by just a few percent (depending on the adopted stellar luminosity) from the actual position of Gl 581g, an estimate that does however not reflect systematic uncertainties inherent in our model. Therefore, in the framework of our model an almost perfect Goldilock position is realized. The existence of habitability is found to critically depend on the relative planetary continental area, lending a considerable advantage to the possibility of life if Gl 581g's ocean coverage is relatively high. Conclusions: Our results are a further step toward identifying the possibility of life beyond the Solar System, especially concerning super-Earth planets, which appear to be more abundant than previously surmised.
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