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在木星家族彗星103P/哈特利2中发现类似海洋的水
Paul Hartogh1, Dariusz C Lis, Dominique Bockelée-Morvan
1Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany. hartogh@mps.mpg.de
Nature
|October 7, 2011
概括
彗星103P/哈特利2中的与的比率与地球的海洋水相匹配. 这一发现表明一些彗星,而不仅仅是小行星,为早期的地球提供了水.
科学领域:
- 行星科学 行星科学
- 天体化学是天体化学.
- 太阳系早期的进化过程
背景情况:
- 地球水的起源,特别是其与 (D/H) 的比例 (1.558 ± 0.001) × 10−4,仍在争论中.
- 地球的构成类似于恩斯塔提特石,这表明早期的地球是干燥的,后来通过小行星或彗星传递挥发性物质.
- 之前的研究表明小行星是主要的水源,奥尔特云彗星具有更高的D/H比率 (2.96 ± 0.25 × 10−4) 和碳状体较低 (1.4 ± 0.1 × 10−4).
研究的目的:
- 研究来自柯伊伯带的木星家族彗星103P/哈特利2的D/H比.
- 评估彗星对地球水库的贡献.
- 改进早期太阳系动态和挥发性传递的模型.
主要方法:
- 来自103P/哈特利彗星的水中测量与 (D/H) 的比率 2.
- 测量D/H比率与地球海洋和其他太阳系天体的比较.
- 在现有模型的背景下对波动性交付和太阳系形成进行分析.
主要成果:
- 彗星103P/哈特利2的D/H比被确定为 (1.61 ± 0.24) × 10−4.4.
- 这个值与地球的大水D/H比率非常相似.
- 这一发现扩大了地球海洋水的潜在来源,包括某些彗星.
结论:
- 彗星,特别是来自柯伊伯带的彗星,如103P/哈特利2,可以成为地球水的重要来源.
- 结果支持一个更复杂的模型,用于早期太阳系的动态进化和挥发性积累.
- 这项研究协调了以前的差异,并扩大了我们对行星水源的理解.
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