Gliese 581中超级地球的可居住性
The habitability of super-Earths in Gliese 581
摘要：
目标：M星Gliese 581周围的行星系统由一个热海王星（Gl 581 b）和两个超级地球（Gl 581 c和Gl 581 d）组成。这个系统的可居住性相对于超级地球的概念，研究光合生物量生产的长期可能性的动态活跃的行星。方法：利用一个超级地球的热演化模型计算大气CO2的源和汇。宜居带是由行星表面的生物生产力极限决定的。研究了具有不同陆地/海洋覆盖率的模型。结果：超级地球Gl 581 c显然在宜居带之外，因为它太靠近恒星。相比之下，GI 581 d是一个潮汐锁定的可居住超级地球，靠近宜居带的外缘。尽管这颗行星上的条件恶劣，但至少有一些原始的生命形式可能能够在其表面生存。因此，Gl 581 d是计划中的TPF/达尔文任务在行星大气中寻找生物标志物的一个有趣的目标。
英文摘要：
Aims: The planetary system around the M star Gliese 581 consists of a hot Neptune (Gl 581b) and two super-Earths (Gl 581c and Gl 581d). The habitability of this system with respect to the super-Earths is investigated following a concept that studies the long-term possibility of photosynthetic biomass production on a dynamically active planet. Methods: A thermal evolution model for a super-Earth is used to calculate the sources and sinks of atmospheric carbon dioxide. The habitable zone is determined by the limits of biological productivity on the planetary surface. Models with different ratios of land / ocean coverage are investigated. Results: The super-Earth Gl 581c is clearly outside the habitable zone, since it is too close to the star. In contrast, Gl 581d is a tidally locked habitable super-Earth near the outer edge of the habitable zone. Despite the adverse conditions on this planet, at least some primitive forms of life may be able to exist on its surface.Therefore, Gl 581d is an interesting target for the planned TPF/Darwin missions to search for biomarkers in planetary atmospheres.
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