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Hurling comets around a planetary nursery

机译：向行星育苗场投掷彗星

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摘要

The Solar System today seems a quiet, orderly place. The planets are on nearly circular orbits, and large collisions with asteroids and comets are rare. But this placid middle age belies the Solar System's turbulent toddler stage nearly 4.6 billion years ago, when asteroids and comets were much more numerous and massive impacts contributed to the build-up of the terrestrial planets - Mercury, Venus, Earth and Mars. On page 462 of this issue, Kiefer et al. open a window on this chaotic late stage of planetary-system formation with 8 years of data on star-grazing comets in the 23-million-year-old planetary system around the star |3 Pictoris (β Pic). The authors show that the comets in this system are not all alike, but instead consist of two families with distinct dynamical and evaporative properties.%附近恒星β Pictoris拥有一个年轻的行星体系,该行星体系很像我们自己的行星体系,在其形成后只有几百万年时间。对在2003年和2011年间记录的1,000多个存档光谱所做的这项分析,显示了由属于两个不同彗星类群的"凌星"太阳系外彗星产生的可变尘埃吸收特征。第一个是挥发性物质已经耗尽的老彗星类群,显示出因与主行星(host planet)发生相互作用而出现的轨道演变特征；第二个是富含挥发性物质的彗星类群,被假设可能是从少数几个母天体的分解产生的。
机译：The Solar System today seems a quiet, orderly place. The planets are on nearly circular orbits, and large collisions with asteroids and comets are rare. But this placid middle age belies the Solar System's turbulent toddler stage nearly 4.6 billion years ago, when asteroids and comets were much more numerous and massive impacts contributed to the build-up of the terrestrial planets - Mercury, Venus, Earth and Mars. On page 462 of this issue, Kiefer et al. open a window on this chaotic late stage of planetary-system formation with 8 years of data on star-grazing comets in the 23-million-year-old planetary system around the star |3 Pictoris (β Pic). The authors show that the comets in this system are not all alike, but instead consist of two families with distinct dynamical and evaporative properties.%附近恒星β Pictoris拥有一个年轻的行星体系,该行星体系很像我们自己的行星体系,在其形成后只有几百万年时间。对在2003年和2011年间记录的1,000多个存档光谱所做的这项分析,显示了由属于两个不同彗星类群的"凌星"太阳系外彗星产生的可变尘埃吸收特征。第一个是挥发性物质已经耗尽的老彗星类群,显示出因与主行星(host planet)发生相互作用而出现的轨道演变特征；第二个是富含挥发性物质的彗星类群,被假设可能是从少数几个母天体的分解产生的。

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  • 来源
    《Nature》 |2014年第7523期|440-441B1|共3页
  • 作者

    AKI ROBERGE;

  • 作者单位

    NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics Laboratory, Greenbelt, Maryland 20771 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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