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SUMMARY:Melaine Saillenfest (IMCCE\, Observatoire de Paris\, France)
DTSTART:20231206T060000Z
DTEND:20231206T070000Z
DTSTAMP:20260423T021435Z
UID:MAC8028/11
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/MAC8028/11/"
 >Coevolution of moons and the spin axis of their host planet</a>\nby Melai
 ne Saillenfest (IMCCE\, Observatoire de Paris\, France) as part of Trends 
 in Mathematical Research\n\nLecture held in NTNU Gongguan S101.\n\nAbstrac
 t\nAstrometric observations of the moons of Jupiter and Saturn have reveal
 ed that their orbits expand over time faster than previously thought. This
  significant orbital "migration" implies that efficient mechanisms of tida
 l energy dissipation are at play in the interiors of gaseous planets. Thes
 e findings profoundly affect our understanding of the formation and evolut
 ion of moons\, but also of the spin-axis dynamics of their host planet. Th
 e coupling between the planet's spin-axis dynamics (the "Cassini states") 
 and the moons' orbital dynamics (the "Laplace plane") can gradually tilt t
 he planet and make the system converge to a highly unstable configuration.
  This mechanism has direct applications in the Solar system: Jupiter today
  is about to start the tilting phase\, Saturn is probably halfway in\, and
  Uranus may have completed the final unstable stage.\n
LOCATION:https://researchseminars.org/talk/MAC8028/11/
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