超级地球：Gliese 581c和581d
Habitability of Super-Earths: Gliese 581c and 581d
摘要：
意想不到的系外行星多样性包括越来越多的超级地球行星，即，质量小于10个地球质量的系外行星。与先前发现的较大系外行星不同，这些较小的行星更有可能具有与地球相似的化学和矿物组成。我们提出了一个超地球行星的热演化模型，以确定大气中二氧化碳的源和汇。光合作用维持宜居带（pHZ）由行星表面生物生产力的极限决定。我们应用我们的模型来计算Gliese 581系统中两个超级地球的可居住性。超级地球Gl 581 c明显在pHZ之外，而Gl 581 d在pHZ的外边缘。因此，它至少可以孕育一些原始的生命形式。
英文摘要：
The unexpected diversity of exoplanets includes a growing number of super-Earth planets, i.e., exoplanets with masses smaller than 10 Earth masses. Unlike the larger exoplanets previously found, these smaller planets are more likely to have a similar chemical and mineralogical composition to the Earth. We present a thermal evolution model for super-Earth planets to identify the sources and sinks of atmospheric carbon dioxide. The photosynthesis-sustaining habitable zone (pHZ) is determined by the limits of biological productivity on the planetary surface. We apply our model to calculate the habitability of the two super-Earths in the Gliese 581 system. The super-Earth Gl 581c is clearly outside the pHZ, while Gl 581d is at the outer edge of the pHZ. Therefore it could at least harbor some primitive forms of life.
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