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JWST molecular mapp...
JWST molecular mapping and characterization of Enceladus’ water plume feeding its torus
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- Villanueva, G. L. (författare)
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
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- Hammel, H. B. (författare)
- Association of Universities for Research in Astronomy, Washington, DC, USA
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- Milam, S. N. (författare)
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
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- Kofman, V. (författare)
- NASA Goddard Space Flight Center, Greenbelt, MD, USA; American University, Washington, DC, USA
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- Faggi, S. (författare)
- NASA Goddard Space Flight Center, Greenbelt, MD, USA; American University, Washington, DC, USA
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- Glein, C. R. (författare)
- Southwest Research Institute, San Antonio, TX, USA
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- Cartwright, R. (författare)
- Carl Sagan Center for Research at the SETI Institute, Mountain View, CA, USA
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- Roth, Lorenz (författare)
- KTH,Rymd- och plasmafysik
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- Hand, K. P. (författare)
- Jet Propulsion Laboratory, Pasadena, CA, USA
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- Paganini, L. (författare)
- NASA Headquarters, Washington, DC, USA
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- Spencer, J. (författare)
- Southwest Research Institute, Boulder, CO, USA
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- Stansberry, J. (författare)
- Space Telescope Science Institute, Baltimore, MD, USA
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- Holler, B. (författare)
- Space Telescope Science Institute, Baltimore, MD, USA
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- Rowe-Gurney, N. (författare)
- NASA Goddard Space Flight Center, Greenbelt, MD, USA; Department of Astronomy & CRESST II, University of Maryland, College Park, MD, USA
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- Protopapa, S. (författare)
- Southwest Research Institute, Boulder, CO, USA
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- Strazzulla, G. (författare)
- INAF-Osservatorio Astrofisico di Catania, Catania, Italy
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- Liuzzi, G. (författare)
- Università degli Studi della Basilicata, Potenza, Italy
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- Cruz-Mermy, G. (författare)
- Universite Paris-Saclay, Orsay, France
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- El Moutamid, M. (författare)
- Cornell Center of Astrophysics and Planetary Sciences, Ithaca, NY, USA
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- Hedman, M. (författare)
- University of Idaho, Moscow, ID, USA
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- Denny, K. (författare)
- University of Idaho, Moscow, ID, USA
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(creator_code:org_t)
- Springer Nature, 2023
- 2023
- Engelska.
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Ingår i: Nature Astronomy. - : Springer Nature. - 2397-3366. ; 7:9, s. 1056-1062
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Enceladus is a prime target in the search for life in our Solar System, having an active plume that is likely to be connected to a large liquid water sub-surface ocean. Using the sensitive near-infrared spectograph instrument on board the James Webb Space Telescope, we searched for organic compounds and characterized the plume’s composition and structure. The observations directly sample the fluorescence emissions of H2O and reveal an extraordinarily extensive plume (up to 10,000 km or 40 Enceladus radii) at cryogenic temperatures (25 K) embedded in a large bath of emission originating from Enceladus’ torus. Intriguingly, the observed outgassing rate (300 kg s−1) is similar to that derived from close-up observations with Cassini 15 years ago, and the torus density is consistent with previous spatially unresolved measurements with Herschel 13 years ago, which indicates that the vigour of gas eruption from Enceladus has been relatively stable over decadal timescales. This level of activity is sufficient to maintain a derived column density of 4.5 × 1017 m−2 for the embedding equatorial torus, and establishes Enceladus as the prime source of water across the Saturnian system. We performed searches for several non-water gases (CO2, CO, CH4, C2H6, CH3OH), but none were identified in the spectra. On the surface of the trailing hemisphere, we observe strong H2O ice features, including its crystalline form, yet we do not recover CO2, CO or NH3 ice signatures from these observations. As we prepare to send new spacecraft into the outer Solar System, these observations demonstrate the unique ability of the James Webb Space Telescope to provide critical support for the exploration of distant icy bodies and cryovolcanic plumes.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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Till lärosätets databas
- Av författaren/redakt...
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Villanueva, G. L ...
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Hammel, H. B.
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Milam, S. N.
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Kofman, V.
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Faggi, S.
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Glein, C. R.
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visa fler...
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Cartwright, R.
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Roth, Lorenz
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Hand, K. P.
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Paganini, L.
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Spencer, J.
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Stansberry, J.
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Holler, B.
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Rowe-Gurney, N.
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Protopapa, S.
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Strazzulla, G.
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Liuzzi, G.
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Cruz-Mermy, G.
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El Moutamid, M.
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Hedman, M.
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Denny, K.
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