A COMPOUND MODEL FOR THE ORIGIN OF EARTH'S WATER
A COMPOUND MODEL FOR THE ORIGIN OF EARTH'S WATER
复制标题
DOI：
10.1088/0004-637x/767/1/54
复制
发表时间：
2013-04-10
影响因子：
4.9
通讯作者：
Haghighipour, N.
中科院分区：
文献类型：
--
作者：
Izidoro, A.;de Souza Torres, K.;Haghighipour, N.
太阳系形成过程中最重要的争论话题之一是地球水的来源。长期以来，彗星一直被认为是向地球输送水的最有可能的来源。然而，元素和同位素论证表明，这些天体的贡献很小。还提出了其他来源，其中，原始星云中尘埃颗粒对水蒸气的局部吸附以及通过行星体和行星胚胎的输送变得更加突出。然而，没有一种唯一的水源能为整个地球的水提供令人满意的解释。有鉴于此，利用数值模拟，我们开发了一个包含主要内生和外生理论的复合模型，并研究了它们对类地行星形成和水输送的影响。归根结底，彗星也被考虑在内，因为很可能地球上至少有部分水起源于彗星。我们比较了两种不同的水分配模型，分析了我们的结果，并使用D/H比补充了我们的研究，找到了每个来源可能的相对贡献，并专注于在宜居带形成的行星。我们发现，复合模型在类地行星的水输送数量和时间上显示出更大的优势，从而发挥了重要作用。
One of the most important subjects of debate in the formation of the solar system is the origin of Earth's water. Comets have long been considered as the most likely source of the delivery of water to Earth. However, elemental and isotopic arguments suggest a very small contribution from these objects. Other sources have also been proposed, among which local adsorption of water vapor onto dust grains in the primordial nebula and delivery through planetesimals and planetary embryos have become more prominent. However, no sole source of water provides a satisfactory explanation for Earth's water as a whole. In view of that, using numerical simulations, we have developed a compound model incorporating both the principal endogenous and exogenous theories, and investigating their implications for terrestrial planet formation and water delivery. Comets are also considered in the final analysis, as it is likely that at least some of Earth's water has cometary origin. We analyze our results comparing two different water distribution models, and complement our study using the D/H ratio, finding possible relative contributions from each source and focusing on planets formed in the habitable zone. We find that the compound model plays an important role by showing greater advantage in the amount and time of water delivery in Earth-like planets.