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.
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Showing 1 to 18 of 18 for “"Planetary formation"”.
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Aspects of planetary formation.
… Institute of Technology. Dept. of Earth and Planetary Sciences.
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The Mercurian magma ocean, first crust, and implications for planetary formation mechanisms
… content of its crust offer constraints on formation models for the planet. Here we consider a bulk composition that allows endogenous formation of the planet's large core, and by processing the mantle through a magma ocean, would produce a low-iron crust. More Earth-like bulk compositions …
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Investigation of Interstellar Object Flux Through the Solar System
… be studied more closely, revealing important information about planetary formation and star system history. Thus, a current observational upper limit of the number density of ISOs through the Solar System was calculated. An updated number density was calculated by incorporating two known ISOs …
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Examining the evidence for Chthonian planets : superdense exposed exoplanet cores
Planetary cores are of interest because they provide insight into the internal dynamics and composition of planets. By using mass-radius relationship compositional analysis, this work originally set out to look for evidence of exoplanet exposed iron cores; it stumbled, however, upon potential …
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Constraining Planetary Science Problems with Micro-Paleomagnetism
… that have direct implications for problems in planetary science. In this thesis I used the techniques from micro-paleomagnetism to address two main problems: (1) when Earth’s magnetic field started and (2) how did the magnetic field in the solar nebula varied in space and time. For the first, I …
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Spectral measurements of hydrogen Lyman-alpha in the atmospheres of Venus and Jupiter using a sounding rocket and the Hubble Space Telescope
… and from this emission many properties of planetary atmospheres can be analyzed. Two projects are studying this emission on two planets for two different scientific purposes. On Venus, the Lyman-alpha emission is being studied to measure the deuterium to hydrogen (D/H) ratio of the …
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Modeling and Characterization of Structural, Thermophysical, and Dynamical Evolutions of Small Bodies in the Solar System
… surprising findings that raise questions about planetary formation, evolution, and even the origins of life. The field of planetary science seeks to address these questions through interdisciplinary approaches, combining insights from astronomy, geology, chemistry, physics, and engineering to …
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THE IMPACT OF TRIPLE STELLAR SYSTEMS ON PROTOSTELLAR DISC DYNAMICS
… a comprehensive theory for disc and planet formation in multiple stellar systems and prepare our models for forthcoming observational data. Throughout this thesis, I underlined the significance of taking into account multiple stellar systems in models of stellar and planetary formation. …
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Subsurface Planetary Investigation Techniques and Their Role for Assessing Subsurface Planetary Composition
<p>Subsurface planetary investigation techniques are of high interest and importance for the scientific community. Not only they can enhance our knowledge of the history of planetary formation but also can lead to information about its future. Whether the investigation is being conducted remotely …
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Planetary Materials Science and Astrobiology
Planetary materials contain signatures of diverse processes in their mineralogy, chemistry, textures and assemblages. The record contained in planetary materials reflects the complex and commonly overprinting relationships between many processes. Discerning what mechanisms have operated to produce …
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Electromagnetic and Quasi-Optical Analysis of Cavity Coupled Bolometers for Far-Infrared and Terahertz Receivers
… open questions in astronomy concerning star and planetary formation, solar system physics as well as galaxy evolution and interaction. As part of the work for this thesis, fast and efficient Python code, GAMMA (Generalised Absorber Mode Matching Analysis), was developed and applied to existing …
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Understanding Mercury's Thermochemical Evolution Using a Geochemical and Geophysical Lens
… that changes with a growing inner core, the formation method of the inner core, and the FeO poor mantle composition. Using this model offers illumination on the conditions Mercury experienced after it formed. This model is limited, but results suggest that Mercury's mantle began at an initial …
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Plume formation in strongly temperature-dependent viscosity fluids: Application to early Mars
… temperature by many orders of magnitude. Plume formation in such fluids is a complex and poorly understood phenomena. Thus, we begin with a systematic two-dimensional numerical and theoretical investigation of plume formation in strongly temperature-dependent viscosity fluids. Then we extend …
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Secular Dynamics of Self-gravitating Debris Discs
Debris discs are the leftovers from the epoch of planetary formation, akin to the Solar System's asteroid and Kuiper belts. They preserve a record of the physical processes at work throughout the system's age, not least planet--disc interactions. Deciphering this record has become a central focus …
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Stellar occultations by bodies in the outer solar system at the South African Astronomical Observatory
Information on the origin and evolutionary processes of the Solar System is harbored by primitive bodies called trans-Neptunian objects (TNOs). Their preserved state is due to these bodies having orbits at and beyond that of Neptune, as this specific area is considered to be the least thermally …
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Iron Isotope Cosmochemistry
… and mantle; Fe is involved in every stage of planetary formation and differentiation. Iron isotope ratios are robust process tracers used to understand the origin of the Solar System, planetary formation, and differentiation processes such as the moon-forming giant impact, core-mantle …
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Design and modeling of kinetic impact missions for deflecting near-earth asteroids
… comets that are thought to be remnants of early planetary formation. As of June 2025, there are more than 1.4 million known small bodies in the solar system, more than 4,000 of which are classified as comets. These objects routinely cross the Earth's orbit at close distances. Some have even …
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On the Application of Machine Learning to Planetary Sciences
… limits of the application of machine learning to planetary sciences. In Chapter 1, the state-of-the-art of data-driven applications to planetary sciences is reviewed. In Chapters 2 and 3, machine learning is applied to improve the realism of terrestrial planet formation studies by streamlining …