论文标题
升华作为（486958）ARROKOTH的扁平裂片的有效机制
Sublimation as an effective mechanism for flattened lobes of (486958) Arrokoth
论文作者
论文摘要
New Horizons航天器的Kuiper Belt对象（KBO）（486958）ARROKOTH露出一个双重形状，具有高度扁平的叶，都与其赤道平面对齐，几乎与轨道平面对齐（斜面〜99 ge）。 Arrokoth属于寒冷的古典Kuiper带对象种群，该物体占据了阳光周围的动态轨道，因此是原位形成的原始物体。因此，它的形状是原始的还是进化的，对理解KBO的演变以及其动态派生的对象，半人马和木星家族彗星（JFC）具有重要意义。应用我们的质量损失驱动形状演化模型（MONET），我们在这里建议，由于在大约1至100 MYR的时间表中挥发性超过狂热，ARROKOTH的当前形状可能具有进化起源，而其旋转状态不会显着影响。我们进一步认为，这种过程在KBO形成后不久的形状的演变中可能无处不在。当KBO动态演变成半人马，然后再接收太阳加热时，这种形状变化的过程也可以重新激活。
The New Horizons spacecraft's flyby of Kuiper Belt Object (KBO) (486958) Arrokoth revealed a bilobed shape with highly flattened lobes both aligned to its equatorial plane, and a rotational axis almost aligned to the orbital plane (obliquity ~99 deg). Arrokoth belongs to the Cold Classical Kuiper Belt Object population that occupies dynamically undisturbed orbits around the Sun, and as such, is a primitive object that formed in situ. Therefore, whether its shape is primordial or evolutionary carries important implications for understanding the evolution of both KBOs and potentially their dynamically derived objects, Centaurs and Jupiter Family Comets (JFC). Applying our mass loss driven shape evolution model (MONET), here we suggest that the current shape of Arrokoth could be of evolutionary origin due to volatile outgassing in a timescale of about 1 to 100 Myr, while its spin state would not significantly affected. We further argue that such a process may be ubiquitous in the evolution of the shape of KBOs shortly after their formation. This shape changing process could also be reactivated when KBOs dynamically evolve to become Centaurs and then JFCs and receive dramatically increased solar heating.
