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arXiv 2302.02668astro-ph.EP
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双星小行星和成对小行星原始成分的亏损

Deficit of primitive compositions in binary asteroids and pairs

Kate Minker, Benoît Carry

摘要:

上下文小的双星系统和双星对被认为是通过Yarkovsky-O 'Keefe-Radzievskii-Paddack(YORP)效应由自旋引起的裂变形成的。预计这一过程取决于其结构强度,因此也取决于其组成。目的。我们的目标是确定如何分类类,作为组成的代理,分布在二进制小行星和小行星对相比,一般人口。方法.我们比较的分布分类类的二进制系统和对小行星的参考样本。我们通过选择小行星来复制双星和双星对的轨道和大小分布来构建这个样本,以最大限度地减少样本之间的潜在偏差。结果在双星小行星和成对小行星中,原始成分(C、B、P、D型)严重不足,而表面成分富含镁铁质硅酸盐的小行星(S、Q、V、A型)严重过剩。结论.在低质量、快速旋转的小行星中,那些富含镁铁质硅酸盐的小行星比原始的小行星更有可能形成多个小行星系统。

英文摘要:

Context. Small binary asteroid systems and pairs are thought to form through fission induced by spin up via the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect. This process is expected to depend on their structural strength, hence composition. Aims. We aim to determine how taxonomic classes, used as a proxy for composition, distribute amongst binary asteroids and asteroid pairs compared to the general population. Methods. We compare the distribution of taxonomic classes of binary systems and pairs with that of a reference sample of asteroids. We build this sample by selecting asteroids to reproduce the orbital and size distribution of the binaries and pairs to minimize potential biases between samples. Results. A strong deficit of primitive compositions (C, B, P, D types) among binary asteroids and asteroid pairs is identified, as well as a strong excess of asteroids with mafic-silicate rich surface compositions (S, Q, V, A types). Conclusions. Amongst low mass, rapidly rotating asteroids, those with mafic-silicate rich compositions are more likely to form multiple asteroid systems than their primitive counterparts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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