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Revealing Callisto'...
Revealing Callisto's Carbon-rich Surface and CO2 Atmosphere with JWST
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- Cartwright, Richard J. (författare)
- Johns Hopkins University Applied Physics Laboratory, USA
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- Villanueva, Geronimo L. (författare)
- NASA Goddard Space Flight Center, USA
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- Holler, Bryan J. (författare)
- Space Telescope Science Institute, USA
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- Camarca, Maria (författare)
- California Institute of Technology, USA
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- Faggi, Sara (författare)
- NASA Goddard Space Flight Center, USA
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- Neveu, Marc (författare)
- NASA Goddard Space Flight Center, USA; University of Maryland, USA
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- Roth, Lorenz (författare)
- KTH,Rymd- och plasmafysik
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- Raut, Ujjwal (författare)
- Southwest Research Institute, San Antonio, TX, USA
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- Glein, Christopher R. (författare)
- Southwest Research Institute, San Antonio, TX, USA
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- Castillo-Rogez, Julie C. (författare)
- California Institute of Technology, USA; Jet Propulsion Laboratory, USA
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- Malaska, Michael J. (författare)
- California Institute of Technology, USA; Jet Propulsion Laboratory, USA
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- Bockelée-Morvan, Dominique (författare)
- LESIA, Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CNRS, France
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- Nordheim, Tom A. (författare)
- Johns Hopkins University Applied Physics Laboratory, USA
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- Hand, Kevin P. (författare)
- California Institute of Technology, USA; Jet Propulsion Laboratory, USA
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- Strazzulla, Giovanni (författare)
- Istituto Nazionale di Astrofisica, Italy
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- Pendleton, Yvonne J. (författare)
- University of Central Florida, USA
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- de Kleer, Katherine (författare)
- California Institute of Technology, USA
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- Beddingfield, Chloe B. (författare)
- Johns Hopkins University Applied Physics Laboratory, USA
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- de Pater, Imke (författare)
- University of California Berkeley, USA
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- Cruikshank, Dale P. (författare)
- University of Central Florida, USA
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- Protopapa, Silvia (författare)
- Southwest Research Institute, Boulder, CO, USA
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(creator_code:org_t)
- American Astronomical Society, 2024
- 2024
- Engelska.
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Ingår i: The Planetary Science Journal. - : American Astronomical Society. - 2632-3338. ; 5:3
- Relaterad länk:
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https://doi.org/10.3...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- We analyzed spectral cubes of Callisto’s leading and trailing hemispheres, collected with the NIRSpec Integrated Field Unit (G395H) on the James Webb Space Telescope. These spatially resolved data show strong 4.25 μm absorption bands resulting from solid-state 12CO2, with the strongest spectral features at low latitudes near the center of its trailing hemisphere, consistent with radiolytic production spurred by magnetospheric plasma interacting with native H2O mixed with carbonaceous compounds. We detected CO2 rovibrational emission lines between 4.2 and 4.3 μm over both hemispheres, confirming the global presence of CO2 gas in Callisto’s tenuous atmosphere. These results represent the first detection of CO2 gas over Callisto’s trailing side. The distribution of CO2 gas is offset from the subsolar region on either hemisphere, suggesting that sputtering, radiolysis, and geologic processes help sustain Callisto’s atmosphere. We detected a 4.38 μm absorption band that likely results from solid-state 13CO2. A prominent 4.57 μm absorption band that might result from CN-bearing organics is present and significantly stronger on Callisto’s leading hemisphere, unlike 12CO2, suggesting these two spectral features are spatially antiassociated. The distribution of the 4.57 μm band is more consistent with a native origin and/or accumulation of dust from Jupiter’s irregular satellites. Other, more subtle absorption features could result from CH-bearing organics, CO, carbonyl sulfide, and Na-bearing minerals. These results highlight the need for preparatory laboratory work and improved surface-atmosphere interaction models to better understand carbon chemistry on the icy Galilean moons before the arrival of NASA’s Europa Clipper and ESA’s JUICE spacecraft.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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Cartwright, Rich ...
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Villanueva, Gero ...
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Holler, Bryan J.
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Camarca, Maria
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Faggi, Sara
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Neveu, Marc
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Roth, Lorenz
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Raut, Ujjwal
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Glein, Christoph ...
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Castillo-Rogez, ...
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Malaska, Michael ...
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Bockelée-Morvan, ...
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Nordheim, Tom A.
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Hand, Kevin P.
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Strazzulla, Giov ...
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Pendleton, Yvonn ...
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de Kleer, Kather ...
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Beddingfield, Ch ...
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de Pater, Imke
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Cruikshank, Dale ...
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Protopapa, Silvi ...
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