All planetesimals born near the Kuiper belt formed as binaries
All planetesimals born near the Kuiper belt formed as binaries
复制标题
所有在柯伊伯带附近诞生的星子都形成为双星
作者：
W. Fraser;M. Bannister;R. Pike;M. Marsset;M. Schwamb;J. Kavelaars;P. Lacerda;D. Nesvorný;K. Volk;A. Delsanti;S. Benecchi;M. Lehner;K. Noll;B. Gladman;J. Petit;S. Gwyn;Ying;Shiang‐Yu Wang;M. Alexandersen;T. Burdullis;S. Sheppard;C. Trujillo
冷经典柯伊伯带天体具有低倾角和偏心率1，2，是唯一的柯伊伯带人口怀疑已形成的situ 3。与动态激发的种群相比，它们表现出广泛的颜色范围和10%4的低二进制分数，冷经典柯伊伯带天体通常具有红色光学颜色5，在二进制对中发现了10%的种群6;这些差异的起源仍然不清楚7，8。我们报告的检测人口的蓝色，tenually绑定二进制居住在寒冷的经典柯伊伯带对象。在这里，我们表明，在海王星迁移的早期阶段，广泛分离的双星可能幸存下来，被推入寒冷的经典区域。蓝色的双星可能是污染物，起源于38 Au，并可能提供一个独特的探针的形成条件，在一个地区，现在几乎没有对象。蓝色天体主要是双星，是推出的产物，这一观点要求星子完全是以倍数形式形成的。合理的形成路径包括通过卵石吸积形成的微行星10和随后通过动态摩擦产生的双星11以及在固体云坍塌期间形成的双星12。几个柯伊伯带天体（KBO）具有异常性质（它们是蓝色的，而相同类型的KBO是红色的，它们都是双星）的发现对太阳系最外层区域的形成过程提出了限制。
The cold classical Kuiper belt objects have low inclinations and eccentricities1,2 and are the only Kuiper belt population suspected to have formed in situ3. Compared with the dynamically excited populations, which exhibit a broad range of colours and a low binary fraction of ∼10%4 cold classical Kuiper belt objects typically have red optical colours5 with ∼30% of the population found in binary pairs6; the origin of these differences remains unclear7,8. We report the detection of a population of blue-coloured, tenuously bound binaries residing among the cold classical Kuiper belt objects. Here we show that widely separated binaries could have survived push-out into the cold classical region during the early phases of Neptune’s migration9. The blue binaries may be contaminants, originating at ∼38 au, and could provide a unique probe of the formative conditions in a region now nearly devoid of objects. The idea that the blue objects, which are predominantly binary, are the products of push-out requires that the planetesimals formed entirely as multiples. Plausible formation routes include planetesimal formation via pebble accretion10 and subsequent binary production through dynamic friction11 and binary formation during the collapse of a cloud of solids12. The discovery of several Kuiper belt objects (KBOs) with anomalous properties (they are blue-coloured, whereas KBOs of the same type are red, and they are all binaries) gives constraints on formation processes in the outermost region of the Solar System.
DOI：
10.3847/0004-6256/152/3/70
发表时间：
2015-11
期刊：
The Astronomical Journal
影响因子：
--
作者：
M. Bannister;M. Bannister;J. Kavelaars;J. Petit;B. Gladman;S. Gwyn;Ying-Tung Chen;K. Volk;M. Alexandersen;S. Benecchi;A. Delsanti;W. Fraser;M. Granvik;W. Grundy;A. Guilbert-Lepoutre;D. Hestroffer;W. Ip;W. Ip;M. Jakubik;L. Jones;N. Kaib;Catherine F. Kavelaars;P. Lacerda;S. Lawler;M. Lehner;Hsing-Wen Lin;T. Lister;P. S. Lykawka;S. Monty;M. Marsset;R. Murray-Clay;K. Noll;A. Parker;R. Pike;P. Rousselot;D. Rusk;M. Schwamb;C. Shankman;B. Sicardy;P. Vernazza;Shiang‐Yu Wang
通讯作者：
M. Bannister;M. Bannister;J. Kavelaars;J. Petit;B. Gladman;S. Gwyn;Ying-Tung Chen;K. Volk;M. Alexandersen;S. Benecchi;A. Delsanti;W. Fraser;M. Granvik;W. Grundy;A. Guilbert-Lepoutre;D. Hestroffer;W. Ip;W. Ip;M. Jakubik;L. Jones;N. Kaib;Catherine F. Kavelaars;P. Lacerda;S. Lawler;M. Lehner;Hsing-Wen Lin;T. Lister;P. S. Lykawka;S. Monty;M. Marsset;R. Murray-Clay;K. Noll;A. Parker;R. Pike;P. Rousselot;D. Rusk;M. Schwamb;C. Shankman;B. Sicardy;P. Vernazza;Shiang‐Yu Wang
影响因子：
4.9
作者：
Leinhardt, Zoe M.;Stewart, Sarah T.
通讯作者：
Stewart, Sarah T.