论文标题
预测缺乏大多数过度钢冰的冰云彗星
A Predicted Dearth of Majority Hypervolatile Ices in Oort Cloud Comets
论文作者
论文摘要
我们介绍了2019年1月1日MU69/Gladstone等人的Arrokoth Flyby，我们提出了新的，特定于ICE的新视野/Alice Upper Gas Coma生产限制。 （2021）并使用它们来预测大多数高volatige（Co，n $ _2 $，ch $ _4 $）在KBO和Oort Cloud Comets中的ICES。这些预测对Oort云的研究具有许多重要的含义，包括：确定富含高精度的彗星，因为将第一个物体放入Oort云中；来自高浮力富含浓度的co/n $ _2 $/ch $ _4 $丰度比的测量。以及对早期（<20 Myr）行星聚集驱动的人群统计限制与后期（> 50 Myr）行星迁移驱动物体驱动物体驱动到Oort云。他们暗示，例如C/2017K2（Jewitt etal。2017; Hui etal。2018）的超级活跃彗星的现象应该很少见，因此不是所有彗星的一般特征。他们还建议，星际对象2i/borisov并非源于富含CO的行星系统（Bodewits等，2020），而是可以在其出生系统历史的早期就被弹出到星际轨迹上。
We present new, ice species-specific New Horizons/Alice upper gas coma production limits from the 01 Jan 2019 MU69/Arrokoth flyby of Gladstone et al. (2021) and use them to make predictions about the rarity of majority hypervolatile (CO, N$_2$, CH$_4$) ices in KBOs and Oort Cloud comets. These predictions have a number of important implications for the study of the Oort Cloud, including: determination of hypervolatile rich comets as the first objects emplaced into the Oort Cloud; measurement of CO/N$_2$/CH$_4$ abundance ratios in the proto-planetary disk from hypervolatile rich comets; and population statistical constraints on early (< 20 Myr) planetary aggregation driven versus later (> 50 Myr) planetary migration driven emplacement of objects into the Oort Cloud. They imply that the phenomenon of ultra-distant active comets like C/2017K2 (Jewitt et al. 2017, Hui et al. 2018) should be rare, and thus not a general characteristic of all comets. They also suggest that interstellar object 2I/Borisov did not originate in a planetary system that was inordinately CO rich (Bodewits et al. 2020), but rather could have been ejected onto an interstellar trajectory very early in its natal system's history.
