Direct detection of the Enceladus water torus with Herschel
Cryovolcanic activity near the south pole of Saturn's moon Enceladus produces plumes of H2O-dominated gases and ice particles, which escape and populate a torus-shaped cloud. Using submillimeter spectroscopy with Herschel, we report the direct detection of the Enceladus water vapor torus in fou...
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/96881 2024-05-19T07:48:41+00:00 Direct detection of the Enceladus water torus with Herschel HARTOGH, P. LELLOUCH, E. MORENO, R. BOCKELÉE-MORVAN, D. BIVER, N. CASSIDY, T. RENGEL, M. JARCHOW, C. CAVALIÉ, T. CROVISIER, J. HELMICH, F. P. KIDGER, M. 2011-08 https://doi.org/10.1051/0004-6361/201117377 en eng EDP Sciences 0004-6361 doi:10.1051/0004-6361/201117377 http://creativecommons.org/licenses/by/ planets and satellites: individual: Saturn planets and satellites: individual: Enceladus techniques: spectroscopic submillimetre: planetary system Planète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP] Physique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP] Article de revue 2011 ftoskarbordeaux https://doi.org/10.1051/0004-6361/201117377 2024-04-22T01:35:44Z Cryovolcanic activity near the south pole of Saturn's moon Enceladus produces plumes of H2O-dominated gases and ice particles, which escape and populate a torus-shaped cloud. Using submillimeter spectroscopy with Herschel, we report the direct detection of the Enceladus water vapor torus in four rotational lines of water at 557, 987, 1113, and 1670 GHz, and probe its physical conditions and structure. We determine line-of-sight H2O column densities of ~4 × 1013 cm-2 near the equatorial plane, with a ~50 000 km vertical scale height. The water torus appears to be rotationally cold (e.g. an excitation temperature of 16 K is measured for the 1113 GHz line) but dynamically excited, with non-Keplerian dispersion velocities of ~2 km s-1, and appears to be largely shaped by molecular collisions. From estimates of the influx rates of torus material into Saturn and Titan, we infer that Enceladus' activity is likely to be the ultimate source of water in the upper atmosphere of Saturn, but not in Titan's. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. HIFI has been designed and built by a consortium of institutes and university departments from across Europe, Canada and the United States under the leadership of SRON Netherlands Institute for Space Research, Groningen, The Netherlands and with major contributions from Germany, France and the US.Figures 4 and 5 are available in electronic form at http://www.aanda.org Article in Journal/Newspaper South pole OSKAR Bordeaux (Open Science Knowledge ARchive) Astronomy & Astrophysics 532 L2 |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
planets and satellites: individual: Saturn planets and satellites: individual: Enceladus techniques: spectroscopic submillimetre: planetary system Planète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP] Physique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP] |
spellingShingle |
planets and satellites: individual: Saturn planets and satellites: individual: Enceladus techniques: spectroscopic submillimetre: planetary system Planète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP] Physique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP] HARTOGH, P. LELLOUCH, E. MORENO, R. BOCKELÉE-MORVAN, D. BIVER, N. CASSIDY, T. RENGEL, M. JARCHOW, C. CAVALIÉ, T. CROVISIER, J. HELMICH, F. P. KIDGER, M. Direct detection of the Enceladus water torus with Herschel |
topic_facet |
planets and satellites: individual: Saturn planets and satellites: individual: Enceladus techniques: spectroscopic submillimetre: planetary system Planète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP] Physique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP] |
description |
Cryovolcanic activity near the south pole of Saturn's moon Enceladus produces plumes of H2O-dominated gases and ice particles, which escape and populate a torus-shaped cloud. Using submillimeter spectroscopy with Herschel, we report the direct detection of the Enceladus water vapor torus in four rotational lines of water at 557, 987, 1113, and 1670 GHz, and probe its physical conditions and structure. We determine line-of-sight H2O column densities of ~4 × 1013 cm-2 near the equatorial plane, with a ~50 000 km vertical scale height. The water torus appears to be rotationally cold (e.g. an excitation temperature of 16 K is measured for the 1113 GHz line) but dynamically excited, with non-Keplerian dispersion velocities of ~2 km s-1, and appears to be largely shaped by molecular collisions. From estimates of the influx rates of torus material into Saturn and Titan, we infer that Enceladus' activity is likely to be the ultimate source of water in the upper atmosphere of Saturn, but not in Titan's. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. HIFI has been designed and built by a consortium of institutes and university departments from across Europe, Canada and the United States under the leadership of SRON Netherlands Institute for Space Research, Groningen, The Netherlands and with major contributions from Germany, France and the US.Figures 4 and 5 are available in electronic form at http://www.aanda.org |
format |
Article in Journal/Newspaper |
author |
HARTOGH, P. LELLOUCH, E. MORENO, R. BOCKELÉE-MORVAN, D. BIVER, N. CASSIDY, T. RENGEL, M. JARCHOW, C. CAVALIÉ, T. CROVISIER, J. HELMICH, F. P. KIDGER, M. |
author_facet |
HARTOGH, P. LELLOUCH, E. MORENO, R. BOCKELÉE-MORVAN, D. BIVER, N. CASSIDY, T. RENGEL, M. JARCHOW, C. CAVALIÉ, T. CROVISIER, J. HELMICH, F. P. KIDGER, M. |
author_sort |
HARTOGH, P. |
title |
Direct detection of the Enceladus water torus with Herschel |
title_short |
Direct detection of the Enceladus water torus with Herschel |
title_full |
Direct detection of the Enceladus water torus with Herschel |
title_fullStr |
Direct detection of the Enceladus water torus with Herschel |
title_full_unstemmed |
Direct detection of the Enceladus water torus with Herschel |
title_sort |
direct detection of the enceladus water torus with herschel |
publisher |
EDP Sciences |
publishDate |
2011 |
url |
https://doi.org/10.1051/0004-6361/201117377 |
genre |
South pole |
genre_facet |
South pole |
op_relation |
0004-6361 doi:10.1051/0004-6361/201117377 |
op_rights |
http://creativecommons.org/licenses/by/ |
op_doi |
https://doi.org/10.1051/0004-6361/201117377 |
container_title |
Astronomy & Astrophysics |
container_volume |
532 |
container_start_page |
L2 |
_version_ |
1799466997744926720 |