ON THE ORIGIN OF INNER COMA STRUCTURES OBSERVED BY ROSETTA DURING A DIURNAL ROTATION OF COMET 67P/CHURYUMOV–GERASIMENKO
ON THE ORIGIN OF INNER COMA STRUCTURES OBSERVED BY ROSETTA DURING A DIURNAL ROTATION OF COMET 67P/CHURYUMOV–GERASIMENKO
复制标题
关于罗塞塔在彗星 67P/CHURYUMOV-GERASIMENKO 昼夜自转期间观察到的内彗发结构的起源
DOI：
10.3847/2041-8205/823/1/l11
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
M. Noack
中科院分区：
文献类型：
--
作者：
Tobias Kramer;M. Noack
罗塞塔号探测器在彗星67 P/Churyumov-Gerasimenko（67 P）周围发现了具有喷流状结构的内彗发的各向异性尘埃分布。导致喷流形成的物理过程仍在争论之中，大多数彗星活动模型都集中在局部排放源，如悬崖或梯田地区。在这里，我们建议，通过将67 P周围尘埃环境的高分辨率模拟与观测相关联，67 P的各向异性和背景尘埃密度来自于整个太阳照射的原子核表面释放的尘埃，而不是来自少数孤立的来源。我们追溯轨道从彗发区域与高的本地尘埃密度在空间中的非球形核，并确定两种机制的射流形成：在两个维度或只有一个与本地的尘埃。坑和火山口是第一种情况的例子; 67 P双叶核的颈部区域是后一种情况的例子。多个来源的结合，除了从所有其他阳光照射的地区释放的灰尘，结果在一个完整的昼夜旋转周期的67 P的预测与观测的高相关系数（0.8）。
The Rosetta probe around comet 67P/Churyumov–Gerasimenko (67P) reveals an anisotropic dust distribution of the inner coma with jet-like structures. The physical processes leading to jet formation are under debate, with most models for cometary activity focusing on localized emission sources, such as cliffs or terraced regions. Here we suggest, by correlating high-resolution simulations of the dust environment around 67P with observations, that the anisotropy and the background dust density of 67P originate from dust released across the entire sunlit surface of the nucleus rather than from few isolated sources. We trace back trajectories from coma regions with high local dust density in space to the non-spherical nucleus and identify two mechanisms of jet formation: areas with local concavity in either two dimensions or only one. Pits and craters are examples of the first case; the neck region of the bi-lobed nucleus of 67P is an example of the latter case. The conjunction of multiple sources, in addition to dust released from all other sunlit areas, results in a high correlation coefficient (∼0.8) of the predictions with observations during a complete diurnal rotation period of 67P.
影响因子：
6
作者：
Kramer, Tobias;Noack, Matthias;Heller, Eric J.
通讯作者：
Heller, Eric J.