Kuiper Belt物体的颜色，成分和热环境（486958）ARROKOTH

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Kuiper Belt物体的颜色，成分和热环境（486958）ARROKOTH

Color, Composition, and Thermal Environment of Kuiper Belt Object (486958) Arrokoth

论文作者

Grundy, W. M., Bird, M. K., Britt, D. T., Cook, J. C., Cruikshank, D. P., Howett, C. J. A., Krijt, S., Linscott, I. R., Olkin, C. B., Parker, A. H., Protopapa, S., Ruaud, M., Umurhan, O. M., Young, L. A., Ore, C. M. Dalle, Kavelaars, J. J., Keane, J. T., Pendleton, Y. J., Porter, S. B., Scipioni, F., Spencer, J. R., Stern, S. A., Verbiscer, A. J., Weaver, H. A., Binzel, R. P., Buie, M. W., Buratti, B. J., Cheng, A., Earle, A. M., Elliott, H. A., Gabasova, L., Gladstone, G. R., Hill, M. E., Horanyi, M., Jennings, D. E., Lunsford, A. W., McComas, D. J., McKinnon, W. B., McNutt Jr., R. L., Moore, J. M., Parker, J. W., Quirico, E., Reuter, D. C., Schenk, P. M., Schmitt, B., Showalter, M. R., Singer, K. N., Weigle II, G. E., Zangari, A. M.

论文摘要

外部太阳系对象（486958）Arrokoth（临时名称2014 Mu $ _ {69} $）自成立以来一直在很大程度上不受干扰。我们使用New Horizons航天器收集的数据研究其表面组成。甲醇冰与有机材料一起存在，这可能是通过简单分子的辐射而形成的。未检测到水冰。该组成表明，富含碳一氧化碳的冰和/或在早期太阳系冷的外边缘在水冰晶粒上凝结的甲烷的氢化和/或能量加工。整个表面的颜色和光谱只有很小的区域变化，这表明由固体的均匀或混合储层形成的arrokoth。冬夜侧的微波热发射与平均亮度温度为29 $ \ pm $ 5 k。

The outer Solar System object (486958) Arrokoth (provisional designation 2014 MU$_{69}$) has been largely undisturbed since its formation. We study its surface composition using data collected by the New Horizons spacecraft. Methanol ice is present along with organic material, which may have formed through radiation of simple molecules. Water ice was not detected. This composition indicates hydrogenation of carbon monoxide-rich ice and/ or energetic processing of methane condensed on water ice grains in the cold, outer edge of the early Solar System. There are only small regional variations in color and spectra across the surface, suggesting Arrokoth formed from a homogeneous or well-mixed reservoir of solids. Microwave thermal emission from the winter night side is consistent with a mean brightness temperature of 29$\pm$5 K.

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