Ejecta distribution from impact craters on Ryugu: Possible origin of the bluer units

Ejecta distribution from impact craters on Ryugu: Possible origin of the bluer units
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龙宫撞击坑的喷射物分布:蓝色单位的可能来源

DOI:
10.1016/j.icarus.2021.114474
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发表时间:
2021
期刊:
影响因子:
3.2
通讯作者:
Ikeya Ren
Ikeya Ren
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hirata Naoyuki;Ikeya Ren

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小行星(162173)Ryugu是第一颗被探测器Hayabusa 2航天器近距离接近的旋转陀螺形小行星,该探测器向地球发送了许多Ryugu的高分辨率图像,揭示了这种类型小行星的性质。琉球的显著特征之一是赤道脊,这被认为是过去快速旋转的结果。尽管海岭的年龄很大,有许多陨石坑,但海岭呈现蓝色,表明它被新的物质覆盖。除了Ryugu之外,许多其他小行星都有类似的蓝色区域,这被认为是喷出物侵位的结果。我们研究了从实际的陨石坑上的Ryugu喷出物毯的分布,以评估喷出物的位置作为Ryugu的蓝色单位的可能来源。我们确定,当Ryugu的旋转速度快时,低纬度形成的陨石坑的喷出物沿着赤道沿着积累,这可以解释赤道脊的蓝色。另一方面,喷出物侵位并不能完全解释Tokoyo Fossa的蓝色,尽管我们试图找到相应的喷出物毯。
Asteroid (162173) Ryugu was the first spinning-top-shaped asteroid to be closely approached by a probe, the Hayabusa2 spacecraft, which sent numerous high-resolution images of Ryugu to the Earth and revealed the nature of this type of asteroid. One of the notable features of Ryugu is the equatorial ridge, which is considered the result of rapid spin in the past. Despite the advanced age of the ridge, indicated by the presence of numerous craters, the ridge exhibits a bluish color, indicating that it is covered with fresh material. In addition to Ryugu, many other asteroids have similar blue areas, which are considered the result of ejecta emplacement. We examined the distribution of ejecta blankets from actual craters on Ryugu to assess ejecta emplacement as a possible origin of Ryugu's bluer units. We determined that when Ryugu's rotation was fast, ejecta from craters formed at lower latitudes accumulated along the equator, which may explain the bluish color of the equatorial ridge. On the other hand, ejecta emplacement does not fully explain the bluish color of Tokoyo Fossa, although we attempted to find the corresponding ejecta blankets.
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