Dust and gas emission from cometary nuclei: the case of comet 67P/Churyumov-Gerasimenko
Dust and gas emission from cometary nuclei: the case of comet 67P/Churyumov-Gerasimenko
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DOI：
10.1080/23746149.2017.1404436
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发表时间：
2018-01-01
影响因子：
6
通讯作者：
Heller, Eric J.
中科院分区：
文献类型：
--
作者：
Kramer, Tobias;Noack, Matthias;Heller, Eric J.
彗星显示随着太阳距离的减少，气体和尘埃粒子的排放增加，导致彗发和尾部的形成。航天器飞行任务提供了对位于彗星核上的尘埃和气体源的时间和空间变化的深入了解。对于67 P/Churyumov-Gerasimenko（67 P/C-G）彗星，罗塞塔使命的长期观测表明，在整个被照亮的表面上有均匀的尘埃排放。尽管初始分布是均匀的，但喷射状结构中的准直变得可见。我们认为，这一观察结果与核心的复杂形状直接相关，并将凹陷的地形特征投射到尘埃慧发中。为了验证这一假设，我们提出了67 P/C-G的气尘描述，其中重力和气体力是从表面网格精确确定的，核的旋转是完全纳入的。新兴的喷流状结构持续广泛的气体-尘埃相互作用，并显示出尘埃速度依赖的弯曲。[图形]。
Comets display with decreasing solar distance an increased emission of gas and dust particles, leading to the formation of the coma and tail. Spacecraft missions provide insight into the temporal and spatial variations of the dust and gas sources located on the cometary nucleus. For the case of comet 67P/Churyumov-Gerasimenko (67P/C-G), the long-term observations from the Rosetta mission point to a homogeneous dust emission across the entire illuminated surface. Despite the homogeneous initial distribution, a collimation in jet-like structures becomes visible. We propose that this observation is linked directly to the complex shape of the nucleus and projects concave topographical features into the dust coma. To test this hypothesis, we put forward a gas-dust description of 67P/C-G, where gravitational and gas forces are accurately determined from the surface mesh and the rotation of the nucleus is fully incorporated. The emerging jet-like structures persist for a wide range of gas-dust interactions and show a dust velocity-dependent bending.[GRAPHICS].