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Solar Wind As The Origin Of Rapid Reddening Of Asteroid Surfaces

机译:太阳风是小行星表面快速变红的起源

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A comparison of the laboratory reflectance spectra of meteorites with observations of asteroids revealed that the latter are much 'redder', with the spectral difference explained by 'space weathering', though the actual processes and timescales involved have remained controversial. A recent study of young asteroid families concluded that they suffered only minimal space weathering. Here we report additional observations of those families, revealing that space weathering must be a very rapid process-the final colour of a silicate-rich asteroid is acquired shortly after its 'birth' (within 10 years of undergoing a catastrophic collision). This rapid timescale favours solar wind implantation as the main mechanism of space weathering, as laboratory experiments have shown that it is the most rapid of several competing processes. We further demonstrate the necessity to take account of composition when evaluating weathering effectiveness, as both laboratory and asteroid data show an apparent dependence of weathering on olivine abundance. The rapid colour change that we find implies that colour trends seen among asteroids are most probably due to compositional or surface-particle-size properties, rather than to different relative ages. Apparently fresh surfaces most frequently seen among small near-Earth asteroids may be the result of tidal shaking that rejuvenates their surfaces during planetary encounters.
机译:陨石的实验室反射光谱与小行星观测结果的比较表明,尽管小行星的“红度”更高,但光谱差异由“空间风化”解释,尽管所涉及的实际过程和时间尺度仍存在争议。最近对年轻的小行星家庭的研究得出的结论是,他们遭受的空间风化作用很小。在这里,我们报告了这些家族的其他观察结果,揭示了空间风化必须是一个非常迅速的过程-富含硅酸盐的小行星的“出生”后不久(发生灾难性碰撞的十年内)就获得了其最终颜色。这种快速的时间尺度有利于将太阳风植入作为空间风化的主要机制,因为实验室实验表明,它是几个竞争过程中最快的。我们进一步证明评估风化效果时必须考虑到组成,因为实验室和小行星数据均显示风化对橄榄石丰度的明显依赖性。我们发现颜色的快速变化暗示着在小行星中看到的颜色趋势很可能是由于组成或表面粒度的性质,而不是由于不同的相对年龄。显然,在小型近地小行星中,最经常看到的新鲜表面可能是潮汐震动的结果,这些震动在行星遭遇期间使它们的表面恢复了活力。

著录项

  • 来源
    《Nature》 |2009年第7241期|p.993-995|共3页
  • 作者单位

    Research and Scientific Support Department, European Space Agency, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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