S19A0119abst

S19A0119

The Jovian icy satellite-Europa possesses an interior ocean that can harbor life. Non-ice, salt materials on the surface would reflect the chemical compositions of the ocean. Reflectance spectra of Europa’s surface have been obtained using Keck and VLT. However, the identification of the salt compositions is controversial because the previous observations covered only limited wavelength ranges (1.5–2.5 µm). Here we propose Subaru/AO188+IRCS observations for Europa’s surface in wavelength of 0.95–1.5 µm. This will allow to identify the salt composition on Europa, e.g., sulfate or chloride salts. The identification provides constraints on the ocean chemistry, available elements for possible life, and formation of the Jovian system.

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