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Water ice and organics on the surface of the asteroid 24 Themis

机译:小行星表面的水冰和有机物24 Themis

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摘要

It has been suggested that Earth's current supply of water was delivered by asteroids, some time after the collision that produced the Moon (which would have vaporized any of the pre-existing water). So far, no measurements of water ice on asteroids have been made, but its presence has been inferred from the comet-like activity of several small asteroids, including two members of the Themis dynamical family. Here we report infrared spectra of the asteroid 24 Themis which show that ice and organic compounds are not only present on its surface but also prevalent. Infrared spectral differences between it and other asteroids make 24 Themis unique so far, and our identification of ice and organics agrees with independent results that rule out other compounds as possible sources of the observed spectral structure. The widespread presence of surface ice on 24 Themis is somewhat unexpected because of the relatively short lifetime of exposed ice at this distance (~3.2AU) from the Sun. Nevertheless, there are several plausible sources, such as a subsurface reservoir that brings water to the surface through 'impact gardening' and/or sublimation.
机译:有人提出,地球的当前水供应是由小行星提供的,这是在产生月球的碰撞发生后的一段时间(月球会蒸发掉任何先前存在的水)。到目前为止,尚未对小行星上的水冰进行任何测量,但是它的存在是根据包括Themis动力家族的两个成员在内的几个小行星的彗星状活动推断出来的。在这里,我们报告了小行星24 Themis的红外光谱,该光谱表明,冰和有机化合物不仅存在于其表面,而且也很普遍。迄今为止,它与其他小行星之间的红外光谱差异使24 Themis独树一帜,我们对冰和有机物的鉴定与独立结果一致,该结果排除了其他化合物作为观察到的光谱结构的可能来源。由于在距太阳这个距离(〜3.2AU)处暴露的冰的寿命相对较短,因此在24个Themis上广泛存在地表冰有些出乎意料。尽管如此,还是有一些合理的来源,例如地下蓄水池,通过“冲击式园艺”和/或升华将水带到地面。

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  • 来源
    《Nature》 |2010年第7293期|p.1320-1321|共2页
  • 作者单位

    University of Central Florida, PO Box 162385, Orlando, Florida 32816-2385, USA;

    University of Central Florida, PO Box 162385, Orlando, Florida 32816-2385, USA;

    N ASA-Ames Research Center, Moffett Field, California 94035, USA;

    NAIC-Arecibo Observatory, Arecibo, Puerto Rico 00612;

    University of Maryland, College Park, Maryland 20742, USA;

    Instituto de Astrofisica de Canarias, Calle Via Lactea s, E-38200 La Laguna, Spain Department of Astrophysics, University of La Laguna, E-38205 La Laguna, Spain;

    Universidade Federal Do Rio De Janeiro, RJ 20080-090, Brazil;

    University of Central Florida, PO Box 162385, Orlando, Florida 32816-2385, USA;

    University of Southern Maine, Department of Physics, Portland, Maine 04104, USA;

  • 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);
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  • 正文语种 eng
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