11:00 AM - 1:00 PM
[PCG19-P03] Feasibility studies on Mars and Venus science for LAPYUTA
Keywords:Mars, Venus, LAPYUTA, Ultraviolet observations, Upper atmosphere
Two of the main targets of LAPYUTA are our neighboring planets, Mars and Venus. Today, these planets have extreme and inhabitable environments. Studies, however, suggest that Mars and Venus might have been habitable planets; They had much water, atmosphere, and possibly life. Then a big question immediately arises; Where did water and atmosphere go? By monitoring hydrogen, oxygen, and carbon UV emissions in their upper atmospheres, we aim to study how Mars and Venus have lost water and experienced climate changes over the history.
In this study, we conducted a feasibility study for LAPYUTA to detect hydrogen (Lyman-alpha), oxygen (1304Å and 1356Å), and carbon (CII 1335Å) emissions as water and carbon tracers in the upper atmosphere of Mars and Venus. These emissions are mainly excited by solar resonant scattering in the exosphere and/or photoelectron impact in the ionosphere. We estimated required accumulation time to accomplish the signal to noise ratio of 5 for each emission line, using measurements from previous missions such as Pioneer Venus Orbiter, MAVEN, and Hisaki. In this presentation, we report spatial and time resolutions that LAPYUTA can address for each emission line when observing the disk, limb, and corona of Mars and Venus, and discuss feasibilities of several scientific objectives.