A scalable approach to modelling gravitational microlensing events for exoplanet demographics in the WFIRST era

美国宇航局即将到来的太空使命WFIRST（宽视场红外太空望远镜）的关键科学目标之一是通过引力微透镜确定冷系外行星的人口统计。目前发现和建模微透镜事件的方法不能扩展到预期来自WFIRST的数据量，以及来自下一代地面调查的数据量。除了不断增加的数据量之外，诸如如何在存在光度噪声的情况下确定行星的证据以及如何处理高度非线性和退化的参数空间等问题仍然没有得到解答。解决这些问题是我博士项目的目标。

One of the key science goals of NASA's upcoming space mission WFIRST (Wide FieldInfrared Space Telescope) is determining the demographics of cool exoplanets by means ofgravitational microlensing. Current approaches to discovering and modeling microlensingevents do not scale to data volumes expected to come from WFIRST, and also the datavolumes from next generation ground based surveys. Besides the increasing data volume,questions such as how to determine the evidence for a planet in the presence of photometricnoise and how to deal with highly nonlinear and degenerate parameter spaces remainunanswered. Answering those questions is the goal of my PhD project.