一组广泛的太阳和宇宙化学数据表明太阳系具有较高的C-N-O丰度
A broad set of solar and cosmochemical data indicates high C-N-O abundances for the solar system
AI总结：
本文利用太阳中微子与太阳风C、N、O新数据及彗星难熔有机物测量，证明较高太阳C-N-O丰度可解释冥王星-卡戎系统密度与CI球粒陨石组成，缓解太阳丰度问题。
摘要：
我们研究了难熔有机物作为原太阳星云外部主要碳载体的作用，及其对大型柯伊伯带天体（KBOs）和CI球粒陨石组成的影响。利用罗塞塔号对67P/丘留莫夫-格拉西缅科彗星中难熔有机物的测量结果，我们表明，基于当前广泛采用的太阳丰度，在KBO形成区域，难熔有机物将占原太阳碳库存的很大一部分。然而，这将释放过多的氧来形成水冰，所产生的固体物质岩石含量不足，无法解释冥王星-卡戎系统及其他大型KBO的非压缩密度；前者被认为是我们所拥有的关于大型KBO整体组成最具代表性的数值（Barr & Schawmb 2016, Bierson & Nimmo 2019）。这一不一致进一步凸显了太阳丰度问题——在协调光谱确定的重元素丰度与日震学约束方面长期存在的挑战。通过采用来自太阳CNO中微子和太阳风中C、N、O测量的新数据集，我们表明冥王星-卡戎系统的非压缩密度可以在广泛的场景范围内得到重现。我们表明，龙宫和贝努样本中缺乏硫酸盐意味着最初吸积到CI球粒陨石母体中的水冰量低于此前认为的水平。这些数据被发现与新数据集所暗示的太阳C/O比值一致。我们的预测可以通过未来的中微子、日震学和宇宙化学测量来检验。
英文摘要：
We examine the role of refractory organics as a major C carrier in the outer protosolar nebula and its implications for the compositions of large Kuiper belt objects (KBOs) and CI chondrites. By utilizing Rosetta measurements of refractory organics in comet 67P/Churyumov-Gerasimenko, we show that they would make up a large fraction of the protosolar C inventory in the KBO-forming region based on the current widely adopted solar abundances. However, this would free up too much O to form water ice, producing solid material that is not sufficiently rock-rich to explain the uncompressed density of the Pluto-Charon system and other large KBOs; the former has been argued as the most representative value we have for the bulk composition of large KBOs (Barr & Schawmb 2016, Bierson & Nimmo 2019). This inconsistency further highlights the solar abundances problem - an ongoing challenge in reconciling spectroscopically determined heavy element abundances with helioseismology constraints. By employing a new dataset from solar CNO neutrinos and solar wind measurements of C, N, and O, we show that the uncompressed density of the Pluto-Charon system can be reproduced over a wide range of scenarios. We show that a lack of sulfates in Ryugu and Bennu samples implies a lower amount of water ice initially accreted into CI chondrite parent bodies than previously thought. These data are found to be consistent with the solar C/O ratio implied by the new dataset. Our predictions can be tested by future neutrino, helioseismology, and cosmochemical measurements.
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