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arXiv 1608.01808astro-ph.EP
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一个新的逆行海王星外天体的发现:低半长轴、高倾角TNO和半人马座的共同轨道平面的暗示

Discovery of A New Retrograde Trans-Neptunian Object: Hint of A Common Orbital Plane for Low Semi-Major Axis, High Inclination TNOs and Centaurs

Ying-Tung Chen, Hsing Wen Lin, Matthew J. Holman, Matthew J. Payne, Wesley C. Fraser, Pedro Lacerda, Wing-Huen Ip, Wen-Ping Chen, Rolf-Peter Kudritzki, Robert J… 展开作者

Ying-Tung Chen, Hsing Wen Lin, Matthew J. Holman, Matthew J. Payne, Wesley C. Fraser, Pedro Lacerda, Wing-Huen Ip, Wen-Ping Chen, Rolf-Peter Kudritzki, Robert Jedicke, Richard J. Wainscoat, John L. Tonry, Eugene A. Magnier, Christopher Waters, Nick Kaiser, Shiang-Yu Wang, Matthew Lehner

摘要:

虽然大多数半人马被认为起源于散射盘,其中高倾角成员来自奥尔特云,但跨海王星天体(TNO)的高倾角成分的起源仍然不确定。我们报告发现一个逆行的TNO,我们昵称为“Niku”,检测泛星1外太阳系调查。我们的数值积分表明,Niku的轨道动力学与2008 KV $_{42}$(Drac)非常相似,半衰期为$\sim 500$ Myr。比较类似的高倾角TNO和半人马座天体($q > 10$ AU,$a < 100$ AU和$i > 60^\circ$),我们发现这些天体在升交点处有一个令人惊讶的集群,并且占据一个共同的轨道平面。该轨道配置具有高度统计学意义:3.8- $σ$。需要一个未知的机制来解释观察到的聚类。这一发现可能为研究高倾角物体的可能储集层提供了一条途径。

英文摘要:

Although the majority of Centaurs are thought to have originated in the scattered disk, with the high-inclination members coming from the Oort cloud, the origin of the high inclination component of trans-Neptunian objects (TNOs) remains uncertain. We report the discovery of a retrograde TNO, which we nickname "Niku", detected by the Pan-STARRS 1 Outer Solar System Survey. Our numerical integrations show that the orbital dynamics of Niku are very similar to that of 2008 KV$_{42}$ (Drac), with a half-life of $\sim 500$ Myr. Comparing similar high inclination TNOs and Centaurs ($q > 10$ AU, $a < 100$ AU and $i > 60^\circ$), we find that these objects exhibit a surprising clustering of ascending node, and occupy a common orbital plane. This orbital configuration has high statistical significance: 3.8-$σ$. An unknown mechanism is required to explain the observed clustering. This discovery may provide a pathway to investigate a possible reservoir of high-inclination objects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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