Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 39 for “"Planetary systems"”.
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Fluids in Planetary Systems
From the early stages of planetary accretion and differentiation to the geomorphology of planetary surfaces and the evolution of life, fluids play an integral role in shaping planetary bodies. Fluid properties and processes were investigated under a range of planetary conditions through (1) …
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Observational Insights into White Dwarf Planetary Systems
… studies of white dwarfs ‘polluted’ by planetary material are a unique laboratory allowing measurements of their bulk composition. This thesis focuses on these polluted white dwarfs to observationally investigate how the material ultimately accretes onto the white dwarfs, and the …
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The formation and evolution of planetary systems
… surveys have revealed thousands of planets and planetary systems that look significantly different from our own. In particular, the preponderance of super-Earths and mini-Neptunes (planets with radii smaller than Neptune's but larger than Earth's) at short orbital radii has challenged planet …
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Polluted White Dwarfs: Insights into Ancient Extrasolar Planetary Systems
… the pollution of white dwarf stars by rocky exoplanetary material offers an insight into the bulk composition of rocky exo-planets, and thus, the geological processes which occur on them. I present a model which reproduces the atmospheric metal abundances present in polluted white dwarf stars …
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Planetary Systems in Polarized Light: Debris Disk Observations and Instrumentation
… i) observational studies of two debris disk systems, Beta Pic and HD 157587, using the Gemini Planet Imager and ii) the characterization and testing of a new type of diffraction grating, called a polarization grating, that we plan to use for future observations of exoplanet atmospheres. The …
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The orbital dynamics and long-term stability of planetary systems
… of these planets are actually part of compact systems with more than one planet. The closeness of the planetary orbits in these multi-planet systems leads to strong dynamical interactions that imprint themselves on the transit light curve as transit timing variations (TTVs). By modeling the …
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A Solution to the Circular Restricted N Body Problem in Planetary Systems
… in the past - the N body problem. By focusing on planetary systems, satellite dynamics can be modeled in a fashion similar to the Circular Restricted Three Body Problem (CR3BP) with the Circular Restricted N Body Problem (CRNBP). It was found that this new formulation of the dynamics can then …
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The Effect of Wide-Orbit Planets on Inner Planetary Systems and Debris
Planetary systems around other stars have been observed to be far more diverse than what would be expected from the example of the Solar System. Exoplanets have been detected with a wide range of sizes and separations from the host star, with a range of orbital properties including large …
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The effects of stochastic forces on the evolution of planetary systems and Saturn's rings
… new opportunity for studies of the formation of planetary systems. Their diversity keeps challenging the long-standing theories which were based on data primarily from our own solar system. Resonant planetary systems are of particular interest because their dynamical configuration provides …
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EXOCOMETS AT LARGE ORBITAL RADII AND THEIR INWARD TRANSPORT IN DEBRIS DISCS
Planetary systems are not only composed of planets, but also of km-sized rocky and icy bodies that are confined within belts similar to the Asteroid and Kuiper belt in the Solar System. Mutual collisions within these belts grind down solids producing dust and giving rise to debris discs. Primitive …
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Elucidating the evolution histories of giant planets with K2 and TESS
… fundamental role in shaping the architecture of planetary systems and the formation and evolution of smaller planets. Over the last few decades, over 1000 giant planets have been discovered outside the Solar System, yet many open questions remain about their formation and evolution histories. How …
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Exogeology as Revealed by Polluted White Dwarfs
… white dwarfs have accreted remnants of their own planetary systems, causing their atmospheres to become polluted by heavy elements. The relative quantities of these elements contain a wealth of information about the composition of the accreted planetary bodies. This thesis focuses on the …
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Characterization of exoplanetary systems combining transit timing techniques and radial velocities: From secular perturbations to resonant chains
… a Sun-like star in 1995, the field of exoplanetary science has evolved into a diverse and rapidly expanding discipline. In the early days, the search for new worlds dominated the field, where each new discovery opened unexplored territory of planetary science and challenged existing …
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Courting Serendipity: The Search for Transient Radio Signals
… of our solar system's magnetized planets. Four planetary systems were observed at the Arecibo Observatory. In 15 hours of 327 MHz observations made over the course of nine days in July, 2004, no detections were made.
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A technique for astronomical spectroscopy with a multi-aperture telescope
… conditions favourable for the formation of planetary systems. There are examples of these types of stars to be found in the Northern hemisphere and which are within the detection limit of the system described in this thesis.
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Eclipsing Binaries and Period Changes in the SuperWASP Archive
… ongoing debate on the reality and stability of planetary systems in such environments. Finally, we used our findings on period changes in ~14000 candidate SuperWASP eclipsing binaries of all types to estimate the higher-order multiplicity fraction of such systems.
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The role of binary stars in searches for extrasolar planets by microlensing and astrometry
… event in which the degeneracy between a planetary binary-lens and an extreme flux ratio binary-source model has been successfully broken. For events OGLE-2003-BLG-222 and OGLE-2004-BLG-347, the degeneracy was encountered despite of very dense data sampling. From light curve modeling and …
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Alternative Mission Concepts for the Exploration of Outer Planets Using Small Satellite Swarms
<p>Interplanetary space exploration has thus far consisted of single, expensive spacecraft missions. Mission costs are particularly high on missions to the outer planets and while invaluable, finite budgets limit our ability to perform extensive and frequent investigations of the planets. Planetary …
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