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A New UV Spectral Feature on Europa : Confirmation of NaCl in Leading-hemisphere Chaos Terrain
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- Trumbo, Samantha K. (author)
- CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA.;Cornell Univ, Cornell Ctr Astrophys & Planetary Sci, Ithaca, NY 14853 USA.
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- Becker, Tracy M. (author)
- Southwest Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA.
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- Brown, Michael E. (author)
- CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA.
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- CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA;Cornell Univ, Cornell Ctr Astrophys & Planetary Sci, Ithaca, NY 14853 USA. Southwest Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA. (creator_code:org_t)
- American Astronomical Society, 2022
- 2022
- English.
- In: The Planetary Science Journal. - : American Astronomical Society. - 2632-3338. ; 3:2
- Journal article (peer-reviewed)
Abstract
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- Recent visible-wavelength observations of Europa's surface obtained with the Hubble Space Telescope (HST) revealed the presence of an absorption feature near 450 nm that appears spatially correlated with leading-hemisphere chaos terrain. This feature was interpreted to reflect the presence of irradiated sodium chloride ultimately sourced from the interior. Here, we use ultraviolet spectra also collected with the HST to detect an additional previously unseen absorption near 230 nm, which spatially correlates with the 450 nm feature and with the same leading-hemisphere chaos terrain. We find that the new ultraviolet feature is also well matched by irradiated sodium chloride at Europa-like conditions. Such confirmation of sodium chloride within geologically young regions has important implications for Europa's subsurface composition.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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