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Hierarchical systems
The thesis addresses the long-term dynamical evolution of hierarchical multiple systems. First, we consider the evolution of orbits of stars orbiting a supermassive black hole (SBH). We study the long-term evolution and compute tidal disruption rates of stars by the SBH. Such disruption events reveal the physics and properties of stars and SBHs.
Furthermore, we study the dynamics of planetesimals in the galactic center (GC). When planetesimals are tidally disrupted by the SBH, this can produce a potentially observable flare. We compute the rates of such disruptions, and find rates consistent with observations, suggesting that planetesimals are formed in the GC around stars, similarly to stars in the solar neighbourhood.
Subsequently, we consider the long-term evolution of hierarchical quadruple systems. We appy our techniques...
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The thesis addresses the long-term dynamical evolution of hierarchical multiple systems. First, we consider the evolution of orbits of stars orbiting a supermassive black hole (SBH). We study the long-term evolution and compute tidal disruption rates of stars by the SBH. Such disruption events reveal the physics and properties of stars and SBHs.
Furthermore, we study the dynamics of planetesimals in the galactic center (GC). When planetesimals are tidally disrupted by the SBH, this can produce a potentially observable flare. We compute the rates of such disruptions, and find rates consistent with observations, suggesting that planetesimals are formed in the GC around stars, similarly to stars in the solar neighbourhood.
Subsequently, we consider the long-term evolution of hierarchical quadruple systems. We appy our techniques to provide an explanation for the lack of transiting circumbinary planets around short-period binaries.
Lastly, we generalise our methods, and apply them to study the implications of the long-term dynamical evolution of multiplanet systems on hot Jupiters (HJs). We find that the long-term dynamical evolution in multiplanet systems can explain at most a few per cent of the observed HJs, unless the efficiency of tidal dissipation is much higher than is currently believed.
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- All authors
- Hamers, A.S.
- Supervisor
- Portegies Zwart, Simon
- Co-supervisor
- Hagai, Perets
- Committee
- Amaro-Seoane, Pau; Mardling, Rosemary; Quillen, Alice; Röttgering, Huub; Tremaine, Scott
- Qualification
- Doctor (dr.)
- Awarding Institution
- Leiden Observatory , Science , Leiden University
- Date
- 2016-06-21
- ISBN
- 9789462333048