Cometary shape and spin-axis evolution due to long term solar driven outgassing

In this work we investigate the role of long term sublimation effects on reshaping the cometary nucleii using 3D shapes coupled with realistic spin-orbit evolution. We try to classify the typical morphological changes that can result from solar driven outgassing starting from various initial conditions. Our model includes different 3D shapes accounting for shadowing and self-heating, orbital elements, orientation parameters and CO sublimation driven cometary activity. These results will provide constraints on the limits pure sublimation activity can provide in terms of nucleus shape and large scale morphology changes during long term evolution of a small icy body in the Kuiper Belt. These simulations provide evidence that certain shape structures (such as observed on the 67P/CG) cannot be produced due to sublimation alone, indicating that other shape defining processes at work (e.g. Jutzi et al, 2017). Similarly, we investigate evolution of spin rates and axis orientations for different nuclei shapes.