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Extremely red Kuiper-belt objects in near-circular orbits beyond 40 AU

机译:在超过40 AU的近圆形轨道上的超红色柯伊伯带天体

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摘要

Kuiper-belt objects (KBOs) are an ancient reservoir of comets beyond Neptune's orbit. Some of these objects were recently found to have the reddest optical colours in the Solar System, but the number of objects for which accurate colours were available was too small for any correlation to be discerned between colour and physical or dynamical properties, which might shed light on the origin of these objects. Here we report that all nine of the KBOs in our survey on near-circular (low-eccentricity) orbits with perihelion distances larger than 40 AU have extremely red surfaces, thereby connecting an observable property with a dynamical class. Of the objects with orbital eccentricities greater than 0.1, about half are also very red, while the rest have colours similar to the Sun, meaning that reflected sunlight is not strongly modified by the objects' surface properties. In addition, of the 13 'classical' KBOs (those with semimajor axis a ≈ 45 AU and eccentricity e < 0.15), the ten that are very red are in orbits with small angles of inclination to the ecliptic, whereas the three with solar colours are all in high-inclination orbits. We suggest that these three 'grey' classical KBOs may be part of a dynamical group that is separate from the 'red' classical KBOs.
机译:柯伊伯带天体(KBOs)是海王星轨道以外的古代彗星储藏库。最近发现这些物体中的一些具有太阳系中最红的光学颜色,但是可以使用准确颜色的物体数量太少,以至于无法辨别颜色与物理或动态特性之间的任何关联,从而可能会发光。这些对象的起源。在这里,我们报告说,在我们的关于近日圆距离大于40 AU的近圆形(低偏心率)轨道的调查中,所有九个KBO都具有非常红色的表面,从而将可观察的性质与动力学类别联系起来。在轨道偏心率大于0.1的物体中,约有一半也是非常红色的,而其余的颜色与太阳相似,这意味着反射的太阳光不会受到物体表面特性的强烈影响。此外,在13个“经典” KBO(长轴为a≈45 AU并且偏心率e <0.15的那些)中,十个非常红的轨道相对于黄道倾斜角度较小,而三个具有太阳色都在高倾角轨道上我们建议这三个“灰色”经典KBO可能是与“红色”经典KBO分开的动力集团的一部分。

著录项

  • 来源
    《Nature》 |2000年第6807期|p.979-981|共3页
  • 作者

    S. C. Tegler; W. Romanishin;

  • 作者单位
  • 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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