论文标题
非生物氧对像地球般的复合寿命的含义
Implications of Abiotic Oxygen Buildup for Earth-like Complex Life
论文作者
论文摘要
分子氧的主要悖论之一（o $ _2 $）是，它是地球上多细胞真核生物的必不可少的，同时通过形成活性氧对其生存构成威胁。在本文中，援引o $ _2 $对地球般的复杂寿命施加的约束来探索非生物o $ $ _2 $库存的世界是否可以藏有这种生物。通过使用一个简单的模型将主要的o $ $ _2 $来源和水槽考虑到类似地球的行星的水源，建议接收到时间平均的X射线和极端紫外线的$ \ gtrsim 10 $ 10 $ 10 $倍地球比地球高的世界可能无法托管复杂的生命形式，因为可以托管分子的光电分析，例如水的构建，可能会导致大量$ $ $ $ _2 $ _2。描述了通过寻找生物签名和非生物o $ _2 $大气指标之间的反相关方法来检验该假设的方法。但是，如果生活成功地适应了高氧环境，这些世界可以允许大型和复杂的生物的发展。
One of the chief paradoxes of molecular oxygen (O$_2$) is that it is an essential requirement for multicellular eukaryotes on Earth while simultaneously posing a threat to their survival via the formation of reactive oxygen species. In this paper, the constraints imposed by O$_2$ on Earth-like complex life are invoked to explore whether worlds with abiotic O$_2$ inventories can harbor such organisms. By taking the major O$_2$ sources and sinks of Earth-like planets into account using a simple model, it is suggested that worlds that receive time-averaged X-ray and extreme ultraviolet fluxes that are $\gtrsim 10$ times higher than Earth might not be capable of hosting complex lifeforms because the photolysis of molecules such as water may lead to significant O$_2$ buildup. Methods for testing this hypothesis by searching for anticorrelations between biosignatures and indicators of abiotic O$_2$ atmospheres are described. In the event, however, that life successfully adapts to high-oxygen environments, these worlds could permit the evolution of large and complex organisms.
