[P-CG19] Planetary Magnetosphere, Ionosphere, and Atmosphere

[PCG19-P08] Feasibility study on LAPYUTA observations of terrestrial planets

*Kei Masunaga¹, Shotaro Sakai^2,3, Shohei Aoki⁴, Fuminori Tsuchiya³, Go Murakami¹, Atsushi Yamazaki¹, Tomoki Kimura⁵, Masato Kagitani³, Ryoichi Koga⁶ (1.Japan Aerospace Exploration Agency, 2.Department of Geophysics, Graduate School of Science, Tohoku University, 3.Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University, 4.Graduate School of Frontier Sciences, University of Tokyo, 5.Faculty of Science, Tokyo University of Science, 6.Nagoya University)

Keywords:LAPYUTA, Mars, Venus

We plan the Life-environmentology, Astronomy, PlanetarY, Ultraviolet Telescope Assembly (LAPYUTA) mission for a future Japanese small-class mission. The space telescope achieves high sensitivity (>100 cm²) and spatial resolution (0.1 arcsec), which is comparable to the Hubble Space Telescope.

Mars and Venus may have once had liquid water and habitable environments. We plan to monitor the upper atmospheres of Mars and Venus with LAPYUTA to determine how water and carbon dioxide on these planets are diffused and transported from the lower to the upper atmosphere, and how they escape into space.

In this presentation, we will report the results of our feasibility study of the observability of hydrogen, oxygen, and carbon atom emission lines in the upper atmospheres of Mars and Venus. We will also report on the D/H ratio observations of the upper atmosphere of Mars and Venus using D 121.534 nm and HI Lyman-alpha observations, which are considered as options.