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arXiv 0903.4915astro-ph.IMastro-ph.EP
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分析行星发现任务的设计

Analyzing the designs of planet finding missions

D. Savransky, N. J. Kasdin, E. Cady

摘要:

我们提出了一个框架,分析直接探测行星发现任务使用空间望远镜。该框架生成完整任务的模拟,不同的行星种群,以产生任务模拟的集合,用于计算任务科学产量的分布。我们描述了任务模拟的组成部分,包括任意行星系统的完整描述,行星发现仪器的描述,以及目标系统观测的建模。这些组件与决策建模算法相结合,使我们能够自动生成具有简单任务规则的任务时间表,从而优化科学产量。随着我们实现该算法的细节,我们讨论验证技术和未来可能的改进。我们应用这种分析技术的四个任务的概念,其共同的元素是一个4米直径的望远镜孔径:一个内部的瞳孔映射日冕与两个不同的内部工作角度,外部遮光器,和THEIA XPC多距离遮光器。这项研究的重点是确定这些设计中的每一个实现其最困难的任务目标之一的能力-在宜居带中探测和表征类地行星。我们发现,所有四种设计都能够在5年的任务中探测到5颗类地行星,即使我们假设每10颗恒星中只有1颗有这样的行星。这些设计在描述他们发现的行星的能力上确实有很大的不同。除了科学收益,我们还分析了两种掩星器设计的燃料使用情况,并讨论了每种任务概念的优点和缺点。

英文摘要:

We present a framework for the analysis of direct detection planet finding missions using space telescopes. This framework generates simulations of complete missions, with varying populations of planets, to produce ensembles of mission simulations, which are used to calculate distributions of mission science yields. We describe the components of a mission simulation, including the complete description of an arbitrary planetary system, the description of a planet finding instrument, and the modeling of a target system observation. These components are coupled with a decision modeling algorithm, which allows us to automatically generate mission timelines with simple mission rules that lead to an optimized science yield. Along with the details of our implementation of this algorithm, we discuss validation techniques and possible future refinements. We apply this analysis technique to four mission concepts whose common element is a 4m diameter telescope aperture: an internal pupil mapping coronagraph with two different inner working angles, an external occulter, and the THEIA XPC multiple distance occulter. The focus of this study is to determine the ability of each of these designs to achieve one of their most difficult mission goals - the detection and characterization of Earth-like planets in the habitable zone. We find that all four designs are capable of detecting on the order of 5 Earth-like planets within a 5 year mission, even if we assume that only 1 out of every 10 stars has such a planet. The designs do differ significantly in their ability to characterize the planets they find. Along with science yield, we also analyze fuel usage for the two occulter designs, and discuss the strengths and weaknesses of each of the mission concepts.

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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