000004600 001__ 4600
000004600 005__ 20200124114130.0
000004600 037__ $$aCTALK-2020-0038
000004600 100__ $$aTrinh, Antony
000004600 245__ $$aA new spin on librational dynamics and an appraisal of tidal-librational dissipation in Enceladus
000004600 260__ $$c2019
000004600 269__ $$c2019-12-13
000004600 520__ $$aSynchronously rotating satellites on eccentric orbits undergo a variable gravitational pull and torque from their parent planet, resulting in periodic global-scale deformations (tides) and spin rate variations (librations). Observations of tides and librations have been insightful to constrain the interior structure of ocean-bearing icy moons. We revisit the subtle coupling between tides and librations, which must really be recognized as the two sides of the same coin. Previous models of librational dynamics based on the formalism of Love numbers misrepresented this coupling, entailing non-physical cavitation and interpenetration at the ocean boundaries. From an extensive benchmark between a set of numerical and semi-analytical models, and with numerous illustrative animations, we pinpoint a new coupling mechanism between tides and librations, which we coin librational loading. We also show that, for Enceladus, librational loading makes tidal-librational dissipation at least 25% larger than traditional tidal dissipation.
000004600 536__ $$aESA/$$cPRODEX/$$fPlanetInt
000004600 594__ $$aNO
000004600 700__ $$aMatsuyama, Isamu
000004600 700__ $$aVan Hoolst, Tim
000004600 700__ $$aBaland, Rose-Marie
000004600 773__ $$tAGU, San Francisco, USA on 2019-12-13
000004600 8560_ $$frose-marie.baland@observatoire.be
000004600 85642 $$ahttps://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/629211
000004600 906__ $$aContributed
000004600 980__ $$aCTALKCONT