OSSOS XI. No active centaurs in the Outer Solar System Origins Survey

OSSOS XI. No active centaurs in the Outer Solar System Origins Survey
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奥索斯十一。

DOI:
10.1051/0004-6361/201834021
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发表时间:
2019
影响因子:
6.5
通讯作者:
Cabral N
Cabral N
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Cabral N

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半人马座是在海王星外区域和内太阳系之间过渡的冰冷物体,在巨行星区域绕太阳运行。一些半人马显示彗星活动,这不能持续的水冰在太阳系的这一部分的升华,并已被假设是由于结晶的无定形水ice.AimsIn这项工作中,我们调查半人马发现的外太阳系起源调查(OSSOS)和搜索彗星活动。试探性的检测将提高对这些objects.MethodsWe的活动的起源的理解搜索通过拟合和减去点扩散函数和尾随点扩散函数从OSSOS图像的每个半人马座的彗发和结构。可用时,Col-OSSOS图像被用来搜索comae.ResultsNo彗星活动中检测到的OSSOS样本。我们跟踪每个新的半人马最近的轨道演变,以确认没有一个实际上被预测为活跃的,我们提供大小估计的objects.ConclusionsThe除了20 OSSOS对象的人口约250已知的半人马是符合目前理解的情况,近日点距离的急剧下降导致热平衡的变化,容易引发巨行星区域的彗星活动。
ContextCentaurs are icy objects in transition between the trans-Neptunian region and the inner solar system, orbiting the Sun in the giant planet region. Some centaurs display cometary activity, which cannot be sustained by the sublimation of water ice in this part of the solar system, and has been hypothesized to be due to the crystallization of amorphous water ice.AimsIn this work, we investigate centaurs discovered by the Outer Solar System Origins Survey (OSSOS) and search for cometary activity. Tentative detections would improve understanding of the origins of activity among these objects.MethodsWe search for comae and structures by fitting and subtracting both point spread functions and trailed point-spread functions from the OSSOS images of each centaur. When available, Col-OSSOS images were used to search also for comae.ResultsNo cometary activity is detected in the OSSOS sample. We track the recent orbital evolution of each new centaur to confirm that none would actually be predicted to be active, and we provide size estimates for the objects.ConclusionsThe addition of 20 OSSOS objects to the population of ~250 known centaurs is consistent with the currently understood scenario, in which drastic drops in perihelion distance induce changes in the thermal balance prone to trigger cometary activity in the giant planet region.
逃逸冥王星的动态演化,半人马座的另一个来源
DOI: --
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