论文标题
与DECAM一起搜索L5 Earth Trojans
Search for L5 Earth Trojans with DECam
论文作者
论文摘要
太阳系中的大多数主要行星都在其L4和L5 Lagrange点上支持共绕的机构，称为Trojans。相比之下，地球只有一个已知的共同伴侣。本文提出了使用CTIO的Blanco望远镜上的DECAM仪器搜索地球木马的结果。尽管与先前对L5点的调查相比，该搜索尚未发现其他木马，尽管覆盖范围更大。因此，这项工作的主要结果是将迄今为止最严格的限制放在地球木马的人群上。这些约束取决于对潜在人口特性的假设，尤其是幅度分布的斜率（这又取决于对象的大小和反照率分布）。对于标准假设，我们将上限计算为$ n_ {et} <1 $的L5人群的90％置信度限制，幅度$ h <15.5 $，$ n_ {et} = 60-85 $ for $ h <19.7 $，$ n_ {et} {et} \ $ = 97 for $ h = 20.4 $。后一个级限制对应于Trojans $ \ sim $ 300 m的反照率$ 0.15 $。在H = 19.7时，这些上限与以前的L4 Earth Trojan约束一致，并显着改善了L5的约束。
Most of the major planets in the Solar System support populations of co-orbiting bodies, known as Trojans, at their L4 and L5 Lagrange points. In contrast, Earth has only one known co-orbiting companion. This paper presents the results from a search for Earth Trojans using the DECam instrument on the Blanco Telescope at CTIO. This search found no additional Trojans in spite of greater coverage compared to previous surveys of the L5 point. Therefore, the main result of this work is to place the most stringent constraints to date on the population of Earth Trojans. These constraints depend on assumptions regarding the underlying population properties, especially the slope of the magnitude distribution (which in turn depends on the size and albedo distributions of the objects). For standard assumptions, we calculate upper limits to a 90% confidence limit on the L5 population of $N_{ET}<1$ for magnitude $H<15.5$, $N_{ET}=60-85$ for $H<19.7$, and $N_{ET}\ $= 97 for $H=20.4$. This latter magnitude limit corresponds to Trojans $\sim$300 m in size for albedo $0.15$. At H=19.7, these upper limits are consistent with previous L4 Earth Trojan constraints and significantly improve L5 constraints.
