Measuring Microlensing Parallax via Simultaneous Observations from Chinese Space Station Telescope and Roman Telescope  

作　　者：Shi Yan Wei Zhu 颜实;祝伟(Department of Astronomy,Tsinghua University,Beijing 100084,China;School of Physics,Nankai University,Tianjin 300071,China;Canadian Institute for Theoretical Astrophysics,University of Toronto,Toronto,ON M5S 3H8,Canada)

机构地区：[1]Department of Astronomy,Tsinghua University,Beijing 100084,China [2]School of Physics,Nankai University,Tianjin 300071,China [3]Canadian Institute for Theoretical Astrophysics,University of Toronto,Toronto,ON M5S 3H8,Canada

出　　处：《Research in Astronomy and Astrophysics》2022年第2期62-71,共10页天文和天体物理学研究（英文版）

基　　金：the science research grants from the China Manned Space Project with No. CMS-CSST-2021-A11。

摘　　要：Simultaneous observations from two spatially well-separated telescopes can lead to measurements of the microlensing parallax parameter,an important quantity toward the determinations of the lens mass.The separation between Earth and Sun–Earth L2 point,~0.01 au,is ideal for parallax measurements of short and ultra-short(~1 hr to 10 days) microlensing events,which are candidates of free-floating planet (FFP) events.In this work,we study the potential of doing so in the context of two proposed space-based missions,the Chinese Space Station Telescope (CSST) in a low-Earth orbit (LEO) and the Nancy Grace Roman Space Telescope (Roman) at L2.We show that joint observations of the two can directly measure the microlensing parallax of nearly all FFP events with timescales t_(E)■10 days as well as planetary (and stellar binary) events that show caustic crossing features.The potential of using CSST alone in measuring microlensing parallax is also discussed.

关 键 词：gravitational lensing:micro stars:fundamental parameters methods:miscellaneous 

分 类 号：P142[天文地球—天体物理]