The role of activity on the evolution of primordial nucleus structures and morphology of Jupiter Family Comets

在彗星动力学和热力学的基础上，我们将探讨彗星活动对木星族彗星（jfc）原始核形状和形态演变的作用。有了罗塞塔号前往67P/丘留莫夫-格拉西缅科（67P/CG）的任务提供的新发现，目标是调查在彗核上看到的结构/地貌特征是否以及哪些特征可以在很长一段时间内保持原始状态。结合轨道演化、自旋状态和彗星活动，我们计划利用罗塞塔提供的前所未有的数据量和质量，重点关注jfc的以下关键问题：A)冰升华和质量输运对彗核形状和大尺度表面形貌的影响；b)出气和尘埃运动对旋转站变化和自旋上升对彗核破裂的影响；c)彗星演化过程中不同时间尺度原始结构和挥发性物质的保存。这项建模研究将从罗塞塔号以及之前的彗星太空任务（星尘号和EPOXI号）中获取各种输入的信息。目的不仅是研究67P/CG，而且确实构建了一个具有物理代表性的jfc类型对象的替代品，以得出有意义的统计结论。这些建立的模型将用于研究轨道动力学模型、旋转动力学模型、传热模型以及半球间/半球内物理质量传递模型的参数。为了适当地解决相关科学问题，研究期间分为三个时期，长，中，短，其中考虑的时期越短，越详细的建模可以在67P/CG上看到的局部尺度。基于这种方法，我们不仅可以得出关于jfc进化的概率结论，还可以对Rosetta提供的有价值的数据进行更确定的解释。

On the basis of dynamics and thermodynamics of comets, we are going to investigate the role of cometary activity on the evolution of primordial nucleus shape and morphology of Jupiter Family Comets (JFCs). Armed with the new findings provided by the Rosetta mission to 67P/Churyumov-Gerasimenko (67P/CG) the aim is to investigate whether and which structural/geomorphological features seen on the nucleus could survive pristine over a long time periods.With the combination of orbit evolution, spin states and cometary activity, we plan to utilize the unprecedented amount and quality of data provided by Rosetta and focus on the following key questions of JFCs: a) nucleus shape and large scale surface morphology regulation resulted from ice sublimation and mass transport, b) the effect of outgassing and dust movements on rotational station change and nucleus breakdown due to spin up, c) the preservation of primordial structure and volatile materials during different time scales of cometary evolution process. This modeling study will draw information on the various input from the Rosetta as well as the previous space missions to comets (StarDust and EPOXI). The aim is not only to study the 67P/CG, but indeed construct a physically representative surrogates of the JFCs type objects to derive meaningful statistical conclusions. These created models will be used to study the parameters of the orbit dynamical model, rotational dynamical model, heat transfer model as well as physical inter/intra-hemispheric mass transport model. In order to properly address the relevant science, the study period is divided into three epoch, long, medium and short, where the shorter the period in consideration the more detailed the modeling can be made down to local scales as seen on the 67P/CG. Based on this approach we will draw not only probabilistic conclusions about the evolution of JFCs, but more deterministic interpretation of the valuable data delivered by Rosetta as well.