论文标题
关于H $ _2 $汤匙系外行星气氛的生命生存能力的实验室研究
Laboratory studies on the viability of life in H$_2$-dominated exoplanet atmospheres
论文作者
论文摘要
通过大气“生物签名气体”在系外行星上寻找生命的理论和观察正在加速，这是由下一代太空和地面望远镜的能力所激发的。最容易获得的岩石行星气氛是由分子氢气主导的岩石行星，因为H $ _2 $ -GAS的低密度会导致膨胀的气氛。但是，在这种情况下，尚未对生活的能力承受这种异国情调的环境。我们证明，通常不居住在H $ _2 $ _2 $ domination的环境中，单细胞微生物（$ \ textit {e。coli} $和酵母）可以在100％h $ _2 $ _2 $氛围中生存并成长。我们还描述了$ \ textit {e产生的数十种不同气体的惊人多样性。大肠杆菌} $，包括已经提出的许多已经作为潜在的生物签名气（例如，一氧化二氮，氨，甲烷硫醇，二甲基硫化物，二甲基硫化物，羰基硫化物和异戊二烯）。这项工作证明了实验实验的实用性，以更好地确定哪种外星环境可以容纳某种可能可检测的生活。
Theory and observation for the search for life on exoplanets via atmospheric "biosignature gases" is accelerating, motivated by the capabilities of the next generation of space- and ground-based telescopes. The most observationally accessible rocky planet atmospheres are those dominated by molecular hydrogen gas, because the low density of H$_2$-gas leads to an expansive atmosphere. The capability of life to withstand such exotic environments, however, has not been tested in this context. We demonstrate that single-celled microorganisms ($\textit{E. coli}$ and yeast) that normally do not inhabit H$_2$-dominated environments can survive and grow in a 100% H$_2$ atmosphere. We also describe the astonishing diversity of dozens of different gases produced by $\textit{E. coli}$, including many already proposed as potential biosignature gases (e.g., nitrous oxide, ammonia, methanethiol, dimethylsulfide, carbonyl sulfide, and isoprene). This work demonstrates the utility of lab experiments to better identify which kinds of alien environments can host some form of possibly detectable life.
