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arXiv 2404.04029astro-ph.EP
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岩石系外行星大气中营养物质可利用性对宜居性的约束

Habitability constraints by nutrient availability in atmospheres of rocky exoplanets

Oliver Herbort, Peter Woitke, Christiane Helling, Aubrey L. Zerkle

AI总结:

本文构建基于水凝析物与 CHNOPS 化学状态的营养可利用性框架,模拟不同地壳成分下的岩石系外行星大气,发现 CNS 可能可被空中生命利用,而 P 和金属构成主要限制。

摘要:

我们所知的生命需要液态水的存在以及可利用的营养物质,这些营养物质主要基于 C、H、N、O、P 和 S 元素(CHNOPS)以及微量金属微量营养素。我们旨在了解在显示存在水云凝析物的大气中这些营养物质的存在情况,这种大气可能允许空中生物圈的存在。在本文中,我们基于水凝析物的存在和 CHNOPS 元素的化学状态,引入了一个营养物质可利用性等级框架。这些营养物质可利用性等级被应用于一组基于不同行星表面成分的大气模型,从而产生一系列大气成分。该大气模型是一个自下而上的平衡化学大气模型,其中包括大气—地壳相互作用以及由于云的形成导致的元素耗竭。虽然对于大多数大气成分而言,CNS 的还原形式存在于水云底部,但 P 和金属却很缺乏。这表明 CNS 具有潜在的生物可利用性,而 P 和金属则是空中生物圈的限制因素。

英文摘要:

Life as we know it requires the presence of liquid water and the availability of nutrients, which are mainly based on the elements C, H, N, O, P, and S (CHNOPS) and trace metal micronutrients. We aim to understand the presence of these nutrients within atmospheres that show the presence of water cloud condensates, potentially allowing the existence of aerial biospheres. In this paper we introduce a framework of nutrient availability levels based on the presence of water condensates and the chemical state of the CHNOPS elements. These nutrient availability levels are applied to a set of atmospheric models based on different planetary surface compositions resulting in a range of atmospheric compositions. The atmospheric model is a bottom-to-top equilibrium chemistry atmospheric model which includes the atmosphere-crust interaction and the element depletion due to the formation of clouds. While the reduced forms of CNS are present at the water cloud base for most atmospheric compositions, P and metals are lacking. This indicates the potential bio-availability of CNS, while P and metals are limiting factors for aerial biospheres.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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