论文标题
在遥远的半人马座上发现的彗星活动：一种非水的升华机制
Cometary Activity Discovered on a Distant Centaur: A Non-Aqueous Sublimation Mechanism
论文作者
论文摘要
半人马是次要行星，被认为起源于外部太阳系区域，称为Kuiper带。活跃的半人马神秘地展示了类似彗星的特征（例如，尾巴，comae），即使它们在天然气巨型地区的轨道上旋转，在那里它太冷了，无法容易升华。自1927年以来，仅确定了18名活跃的患者，因此，到目前为止，基本的活性机制在很大程度上仍然尚不清楚。在这里，我们报告了从Centaur 2014 OG392发出的活动的发现，基于我们发现的档案图像，以及我们自己的新观测证据，用黑暗能源摄像机（Cerro Tololo tololo Intererican Inter-American observatory Blanco 4 m望远镜），Inamori-Magellan Areal Camper＆loser campanas and the Monionc and the Monionc and the Monitore campanities and the Monitore clite bA） （洛厄尔天文台4.3 m发现通道望远镜）。从2014年的OG392开始，我们发现昏迷至400,000公里，我们对升华过程和动态寿命的新分析表明，二氧化碳和/或氨是最有可能在此和其他活跃的百分比上进行活动的候选者。我们发现2014年OG392是光学红色的，但是在这种波长状态下，二氧化碳和NH3在光谱中是中性的，因此红粉剂尚未确定。
Centaurs are minor planets thought to have originated in the outer Solar System region known as the Kuiper Belt. Active Centaurs enigmatically display comet-like features (e.g., tails, comae) even though they orbit in the gas giant region where it is too cold for water to readily sublimate. Only 18 active Centaurs have been identified since 1927 and, consequently, the underlying activity mechanism(s) have remained largely unknown up to this point. Here we report the discovery of activity emanating from Centaur 2014 OG392, based on archival images we uncovered plus our own new observational evidence acquired with the Dark Energy Camera (Cerro Tololo Inter-American Observatory Blanco 4 m telescope), the Inamori-Magellan Areal Camera & Spectrograph (Las Campanas Observatory 6.5 m Walter Baade Telescope) and the Large Monolithic Imager (Lowell Observatory 4.3 m Discovery Channel Telescope). We detect a coma as far as 400,000 km from 2014 OG392, and our novel analysis of sublimation processes and dynamical lifetime suggest carbon dioxide and/or ammonia are the most likely candidates for causing activity on this and other active Centaurs. We find 2014 OG392 is optically red, but CO2 and NH3 are spectrally neutral in this wavelength regime so the reddening agent is as yet unidentified.
