论文标题
恒星磷对我们对系外行星和天体生物学的理解的影响
The Influence of Stellar Phosphorus On Our Understanding of Exoplanets and Astrobiology
论文作者
论文摘要
在寻找系外行星并最终考虑其宜居性时，有必要考虑地球的组成，地球物理过程和地球化学周期，以限制生命可用的生物质量元素。确定超球星生态系统的元素比是不可能的，但是我们通常认为行星具有与宿主恒星相似的组合物。因此，使用附近恒星的高分辨率恒星丰度的高血压目录，我们将主序列恒星的C，N，Si和P丰度比进行比较与平均海洋浮游生物，地球的地壳以及大块的硅酸盐和Mars和Mars的C，N，SI和P丰度比。我们发现，与附近的恒星相比，通常，浮游生物，地球和火星是N贫穷的，P-Rich。但是，仅有〜1％的全明星和1％的外部宿主的P含量数据的缺乏使得很难推断出恒星数据中的清晰趋势，更不用说P在外部球星发展中的作用了。我们的太阳具有相对较高的P和地球生物学，需要一个小但有限的P.在岩石行星上形成的岩石行星围绕P较少P的岩石行星，P降低了P，将P分配到核心中可能排除表面P的潜力，从而排除该行星表面上的生命。因此，我们敦促恒星丰富的社区将P观测作为未来研究和望远镜设计的优先事项。
When searching for exoplanets and ultimately considering their habitability, it is necessary to consider the planet's composition, geophysical processes, and geochemical cycles in order to constrain the bioessential elements available to life. Determining the elemental ratios for exoplanetary ecosystems is not yet possible, but we generally assume that planets have compositions similar to those of their host stars. Therefore, using the Hypatia Catalog of high-resolution stellar abundances for nearby stars, we compare the C, N, Si, and P abundance ratios of main sequence stars with those in average marine plankton, Earth's crust, as well as bulk silicate Earth and Mars. We find that, in general, plankton, Earth, and Mars are N-poor and P-rich compared with nearby stars. However, the dearth of P abundance data, which exists for only ~1% of all stars and 1% of exoplanet hosts, makes it difficult to deduce clear trends in the stellar data, let alone the role of P in the evolution of an exoplanet. Our Sun has relatively high P and Earth biology requires a small, but finite, amount of P. On rocky planets that form around host stars with substantially less P, the strong partitioning of P into the core could rule out the potential for surface P and, consequently, for life on that planet's surface. Therefore, we urge the stellar abundance community to make P observations a priority in future studies and telescope designs.
