Strong tidal dissipation in Saturn and constraints on Enceladus' thermal state from astrometry
Tidal interactions between Saturn and its satellites play a crucial role in both the orbital migration of the satellites and the heating of their interiors. Therefore constraining the tidal dissipation of Saturn (here the ratio k2/Q) opens the door to the past evolution of the whole system. If Satur...
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Other Authors: | , , , , , , , , , , , , , , , , , |
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Language: | English |
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HAL CCSD
2012
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Online Access: | https://hal.science/hal-00691025 |
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institution |
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HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
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language |
English |
topic |
Astrophysics Earth and Planetary Astrophysics Astrometry Celestial mechanics Ephemeris Planets and satellites: dynamical evolution and stability Planets and satellites: interiors [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] |
spellingShingle |
Astrophysics Earth and Planetary Astrophysics Astrometry Celestial mechanics Ephemeris Planets and satellites: dynamical evolution and stability Planets and satellites: interiors [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] Lainey, Valéry Karatekin, Özgür Desmars, Josselin Charnoz, Sébastien Arlot, Jean-Eudes Emelyanov, Nicolai Le Poncin-Lafitte, Christophe Mathis, Stéphane Remus, Françoise Tobie, Gabriel Zahn, Jean-Paul Strong tidal dissipation in Saturn and constraints on Enceladus' thermal state from astrometry |
topic_facet |
Astrophysics Earth and Planetary Astrophysics Astrometry Celestial mechanics Ephemeris Planets and satellites: dynamical evolution and stability Planets and satellites: interiors [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] |
description |
Tidal interactions between Saturn and its satellites play a crucial role in both the orbital migration of the satellites and the heating of their interiors. Therefore constraining the tidal dissipation of Saturn (here the ratio k2/Q) opens the door to the past evolution of the whole system. If Saturn's tidal ratio can be determined at different frequencies, it may also be possible to constrain the giant planet's interior structure, which is still uncertain. Here, we try to determine Saturn's tidal ratio through its current effect on the orbits of the main moons, using astrometric data spanning more than a century. We find an intense tidal dissipation (k2/Q= (2.3 \pm 0.7) \times 10-4), which is about ten times higher than the usual value estimated from theoretical arguments. As a consequence, eccentricity equilibrium for Enceladus can now account for the huge heat emitted from Enceladus' south pole. Moreover, the measured k2/Q is found to be poorly sensitive to the tidal frequency, on the short frequency interval considered. This suggests that Saturn's dissipation may not be controlled by turbulent friction in the fluid envelope as commonly believed. If correct, the large tidal expansion of the moon orbits due to this strong Saturnian dissipation would be inconsistent with the moon formations 4.5 Byr ago above the synchronous orbit in the Saturnian subnebulae. But it would be compatible with a new model of satellite formation in which the Saturnian satellites formed possibly over longer time scale at the outer edge of the main rings. In an attempt to take into account for possible significant torques exerted by the rings on Mimas, we fitted a constant rate da/dt on Mimas semi-major axis, also. We obtained an unexpected large acceleration related to a negative value of da/dt= -(15.7 \pm 4.4) \times 10-15 au/day. |
author2 |
Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS) Royal Observatory of Belgium = Observatoire Royal de Belgique (ROB) Shanghai Astronomical Observatory Shanghai (SHAO) Chinese Academy of Sciences Beijing (CAS) Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Sternberg Astronomical Institute Moscow Lomonosov Moscow State University (MSU) Systèmes de Référence Temps Espace (SYRTE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Laboratoire Univers et Théories (LUTH (UMR_8102)) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Report |
author |
Lainey, Valéry Karatekin, Özgür Desmars, Josselin Charnoz, Sébastien Arlot, Jean-Eudes Emelyanov, Nicolai Le Poncin-Lafitte, Christophe Mathis, Stéphane Remus, Françoise Tobie, Gabriel Zahn, Jean-Paul |
author_facet |
Lainey, Valéry Karatekin, Özgür Desmars, Josselin Charnoz, Sébastien Arlot, Jean-Eudes Emelyanov, Nicolai Le Poncin-Lafitte, Christophe Mathis, Stéphane Remus, Françoise Tobie, Gabriel Zahn, Jean-Paul |
author_sort |
Lainey, Valéry |
title |
Strong tidal dissipation in Saturn and constraints on Enceladus' thermal state from astrometry |
title_short |
Strong tidal dissipation in Saturn and constraints on Enceladus' thermal state from astrometry |
title_full |
Strong tidal dissipation in Saturn and constraints on Enceladus' thermal state from astrometry |
title_fullStr |
Strong tidal dissipation in Saturn and constraints on Enceladus' thermal state from astrometry |
title_full_unstemmed |
Strong tidal dissipation in Saturn and constraints on Enceladus' thermal state from astrometry |
title_sort |
strong tidal dissipation in saturn and constraints on enceladus' thermal state from astrometry |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-00691025 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
https://hal.science/hal-00691025 2012 |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/1204.0895 hal-00691025 https://hal.science/hal-00691025 ARXIV: 1204.0895 BIBCODE: 2012arXiv1204.0895L |
_version_ |
1802650228192444416 |
spelling |
ftceafr:oai:HAL:hal-00691025v1 2024-06-23T07:56:52+00:00 Strong tidal dissipation in Saturn and constraints on Enceladus' thermal state from astrometry Lainey, Valéry Karatekin, Özgür Desmars, Josselin Charnoz, Sébastien Arlot, Jean-Eudes Emelyanov, Nicolai Le Poncin-Lafitte, Christophe Mathis, Stéphane Remus, Françoise Tobie, Gabriel Zahn, Jean-Paul Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS) Royal Observatory of Belgium = Observatoire Royal de Belgique (ROB) Shanghai Astronomical Observatory Shanghai (SHAO) Chinese Academy of Sciences Beijing (CAS) Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Sternberg Astronomical Institute Moscow Lomonosov Moscow State University (MSU) Systèmes de Référence Temps Espace (SYRTE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Laboratoire Univers et Théories (LUTH (UMR_8102)) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2012-04-04 https://hal.science/hal-00691025 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/arxiv/1204.0895 hal-00691025 https://hal.science/hal-00691025 ARXIV: 1204.0895 BIBCODE: 2012arXiv1204.0895L https://hal.science/hal-00691025 2012 Astrophysics Earth and Planetary Astrophysics Astrometry Celestial mechanics Ephemeris Planets and satellites: dynamical evolution and stability Planets and satellites: interiors [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] info:eu-repo/semantics/preprint Preprints, Working Papers, . 2012 ftceafr 2024-06-03T23:42:37Z Tidal interactions between Saturn and its satellites play a crucial role in both the orbital migration of the satellites and the heating of their interiors. Therefore constraining the tidal dissipation of Saturn (here the ratio k2/Q) opens the door to the past evolution of the whole system. If Saturn's tidal ratio can be determined at different frequencies, it may also be possible to constrain the giant planet's interior structure, which is still uncertain. Here, we try to determine Saturn's tidal ratio through its current effect on the orbits of the main moons, using astrometric data spanning more than a century. We find an intense tidal dissipation (k2/Q= (2.3 \pm 0.7) \times 10-4), which is about ten times higher than the usual value estimated from theoretical arguments. As a consequence, eccentricity equilibrium for Enceladus can now account for the huge heat emitted from Enceladus' south pole. Moreover, the measured k2/Q is found to be poorly sensitive to the tidal frequency, on the short frequency interval considered. This suggests that Saturn's dissipation may not be controlled by turbulent friction in the fluid envelope as commonly believed. If correct, the large tidal expansion of the moon orbits due to this strong Saturnian dissipation would be inconsistent with the moon formations 4.5 Byr ago above the synchronous orbit in the Saturnian subnebulae. But it would be compatible with a new model of satellite formation in which the Saturnian satellites formed possibly over longer time scale at the outer edge of the main rings. In an attempt to take into account for possible significant torques exerted by the rings on Mimas, we fitted a constant rate da/dt on Mimas semi-major axis, also. We obtained an unexpected large acceleration related to a negative value of da/dt= -(15.7 \pm 4.4) \times 10-15 au/day. Report South pole HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) South Pole |