在废墟堆叠的二进制小行星系统 (65803) Didymos上,有证据表明了多重碎片和巨石的大量流失
M Pajola1, F Tusberti2, A Lucchetti2
1INAF-Astronomical Observatory of Padova, Padova, Italy. maurizio.pajola@inaf.it.
Nature communications
|July 30, 2024
概括
使用NASA DART任务数据,对小行星迪迪莫斯及其月球Dimorphos上的岩石进行分析,表明二进制小行星是从一颗主要小行星流失质量中形成的. 这就解释了在Dimorphos.com上观察到的更高的岩石密度.
科学领域:
- 行星科学 行星科学
- 小行星研究研究.
- 太空任务分析
背景情况:
- 小行星<10公里通常是灾难性破坏的废墟堆.
- 一些小行星以二进制系统的形式存在,但它们的形成尚未得到充分理解.
- 美国宇航局的DART任务提供了关于小行星 (65803) Didymos及其小卫星Dimorphos的数据.
研究的目的:
- 为了研究小行星二进制系统的形成机制.
- 分析Didymos和Dimorphos的表面岩石分布和特征.
- 了解二进制小行星系统中巨石密度的影响.
主要方法:
- 使用DART任务数据对Didymos和Dimorphos上的岩石大小频率分布进行分析.
- 比较Dimorphos和以前研究的小行星 (Bennu,Ryugu,Itokawa) 之间的巨石密度.
- 检查表面岩石分布和形状,以推断物质遗传.
主要成果:
- 岩石分布证实迪迪摩斯和迪莫福斯是祖先破坏的废墟堆.
- 与单个小行星Bennu,Ryugu和Itokawa相比,Dimorphos的岩石密度每平方公里显著更高.
- 表面岩石的特征表明,Dimorphos从Didymos遗传了材料.
结论:
- 二元小行星系统可能会经历随后的碎片化,增加它们的块密度.
- 这些发现支持这样一个假设,即一些二进制小行星是通过旋转的主要小行星的质量流失而形成的.
- 与单个小行星相比,小行星二进制系统可能具有不同的表面特性.
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