Measuring microlensing parallax via simultaneous observations from Chinese Space Station Telescope and Roman Telescope
Shi Yan, Wei Zhu (Tsinghua)
Simultaneous observations from two spatially well-separated telescopes can lead to the 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 Leo orbit and the Nancy Grace Roman Space Telescope (\emph{Roman}) at L2. We show that the joint observations of the two can directly measure the microlensing parallax of nearly all FFP events with timescales tE≲ 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.
Comments: accepted to Research in Astronomy and Astrophysics (RAA)
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Astrophysics of Galaxies (astro-ph.GA); Instrumentation and Methods for Astrophysics (astro-ph.IM)
Cite as: arXiv:2111.11002 [astro-ph.EP] (or arXiv:2111.11002v1 [astro-ph.EP] for this version)
Submission history
From: Wei Zhu
[v1] Mon, 22 Nov 2021 06:06:29 UTC (175 KB)
