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Literatura científica selecionada sobre o tema "Planètes externes – Migration"
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Teses / dissertações sobre o assunto "Planètes externes – Migration"
Griveaud, Philippine. "Migration de planètes géantes dans des disques à faible viscosité". Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ5050.
Texto completo da fonteA paradigm shift in protoplanetary disc (PPD) modelling has recently occurred, favoring magnetically-driven disc winds in the upper layers over turbulence-driven accretion onto the central star. In this model, the disc's midplane would maintain very low viscosity levels. This shift in paradigm could have significant implications for planetary system formation. Over the past 30 years, the literature on planet-disc interactions has mostly considered highly viscous discs. This thesis investigates how a low-viscosity midplane influences the migration of multiple giant planets.In the first part of this thesis, we examine the migration of pairs of giant planets. Our results show a profoundly different migration behaviour of Jupiter and Saturn compared to that in a high-viscosity disc.Previously locked in a 3:2 mean motion resonance (MMR) and migrating outwards, we find them locked in a 2:1 MMR and migrating inwards. The study covers a wide parameter space, including the mass of the outer planet, which validates the robustness of our result. For any pair featuring an inner planet of Jupiter's mass, the 2:1 MMR is never crossed, resulting most likely in inward migration.In the second part of this thesis, we expand upon our initial study by adding Uranus and Neptune in the system. The aim of this project was to explore what resonant chains of multiple giant planets can form in a low-viscosity disc, and whether these configurations can evolve into forming the Solar System in the post gas disc phase. First, we find that building stable resonant chains of giant planets in a low-viscosity disc is quite challenging. Lower viscosity results in wider and deeper gaps opened by the giant planets, which reduces the disc's damping effect. Consequently, when planets enter a resonance, the resonant angle stays closer to circulation, weakening the chain. Despite these challenges, our exploration of numerous configurations revealed five stable resonant chains of four or five planets for two different disc thicknesses.Additionally, we discovered that in a thin (and thus cold) PPD, the four giant planets reverse their migration direction and move outwards. We then investigated whether these resonant chains could serve as initial conditions for the Nice Model -- a giant planet instability phase occurring after the gas disc dispersal.Through a statistical study of N-Body simulations, we found that chains formed in cold PPDs yield about a 1% success rate in reproducing the current Solar System, whereas those formed in a thicker disc are highly stable and do not replicate the Nice Model. This success rate is assessed against four criteria designed to match features of today's Solar System. A 1% success aligns with the Nice Model literature, and is sufficient to explain our uncommon system. We conclude that the Solar System could have emerged from a low-viscosity disc, provided the disc was cold and the leftover planetesimal disc was massive.This work presents the first fully consistent dynamical study of the giant planets in the Solar System, covering their migration in the protoplanetary disc up to the Nice Model instability.Finally, the only system with multiple protoplanets observed in a protoplanetary disc to date, PDS 70, has two giant planets located near the 2:1 MMR. It is compelling to compare these findings with those from the first part of this thesis. However, observations of protoplanetary discs trace the dust component of the disc. Therefore, to effectively compare numerical simulations with observed systems, it is crucial to incorporate dust into the numerical models. In an effort to replicate the PDS 70 system, we have begun integrating dust into our simulations from our initial work. This project aims to assess whether a low-viscosity disc can accurately reproduce both the dynamical evolution of the two planets in PDS 70 and the observed dust structure in the system
Livros sobre o assunto "Planètes externes – Migration"
Ontario. Esquisse de cours 12e année: Sciences de l'activité physique pse4u cours préuniversitaire. Vanier, Ont: CFORP, 2002.
Encontre o texto completo da fonteOntario. Esquisse de cours 12e année: Technologie de l'information en affaires btx4e cours préemploi. Vanier, Ont: CFORP, 2002.
Encontre o texto completo da fonteOntario. Esquisse de cours 12e année: Études informatiques ics4m cours préuniversitaire. Vanier, Ont: CFORP, 2002.
Encontre o texto completo da fonteOntario. Esquisse de cours 12e année: Mathématiques de la technologie au collège mct4c cours précollégial. Vanier, Ont: CFORP, 2002.
Encontre o texto completo da fonteOntario. Esquisse de cours 12e année: Sciences snc4m cours préuniversitaire. Vanier, Ont: CFORP, 2002.
Encontre o texto completo da fonteOntario. Esquisse de cours 12e année: English eae4e cours préemploi. Vanier, Ont: CFORP, 2002.
Encontre o texto completo da fonteOntario. Esquisse de cours 12e année: Le Canada et le monde: une analyse géographique cgw4u cours préuniversitaire. Vanier, Ont: CFORP, 2002.
Encontre o texto completo da fonteOntario. Esquisse de cours 12e année: Environnement et gestion des ressources cgr4e cours préemploi. Vanier, Ont: CFORP, 2002.
Encontre o texto completo da fonteOntario. Esquisse de cours 12e année: Histoire de l'Occident et du monde chy4c cours précollégial. Vanier, Ont: CFORP, 2002.
Encontre o texto completo da fonteOntario. Esquisse de cours 12e année: Géographie mondiale: le milieu humain cgu4u cours préuniversitaire. Vanier, Ont: CFORP, 2002.
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