Microlens parallax measurement via simultaneous observations of the Chinese Space Station Telescope and the Roman Telescope

Microlens parallax measurement via simultaneous observations of the Chinese Space Station Telescope and the Roman Telescope

Status report from: arXiv.org e-Print archive
Posted: Friday December 3 2021

Shi Yan, Wei Zhu (Tsinghua)

The simultaneous observations of two spatially well separated telescopes can lead to measurements of the parallax parameter of the microlens, an important quantity for the determination of the mass of the lens. The separation between Earth and Sun-Earth L2 point, 0.01 AU, is ideal for parallax measurements of short and ultra-short microlens events (∼1 , hr to 10 , days), which are Free Floating Planet Candidates (FFP). In this work, we investigate the potential to do so in the context of two proposed space missions, the Chinese Space Station Telescope (CSST) in Lion Orbit and the Nancy Grace Roman Space Telescope ( emph {Roman}) at L2. . We show that joint observations of the two can directly measure the microlens parallax of almost all FFP events with tE≲ 10 , days timescales as well as planetary (and stellar binary) events that show caustic crossing characteristics. The potential of using CSST alone in measuring microlens parallax is also discussed.

Comments: accepted for research in astronomy and astrophysics (RAA)

Topics: Terrestrial and planetary astrophysics (astro-ph.EP); Astrophysics of Galaxies (astro-ph.GA); Instrumentation and Methods for Astrophysics (astro-ph.IM)

Quote as: arXiv: 2111.11002 [astro-ph.EP] (or arXiv: 2111.11002v1 [astro-ph.EP] for this version)

History of submissions

From: Wei Zhu

[v1] Mon, November 22, 2021 06:06:29 UTC (175 KB)

https://arxiv.org/abs/2111.11002

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