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 20 of 58 for “"Planet Formation"”.
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Planet formation and evolution in protoplanetary disc
In the last decades, thousands of exoplanets have been detected, revealing a variety of characteristics different from those of the Solar System's planets - the only planets orbiting a main sequence star known until 1995. This enhanced the interest in processes of planet formation and evolution …
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Planet formation, resonant drag instabilities, and vortices
… of this thesis is a brief overview of modern planet formation theory. I first present the four critical observations that any model should reproduce: planets form from the aggregation of countless dust grains early in the life of almost every protoplanetary disc . I then describe the main …
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The impact of star cluster environments on planet formation
… form within clusters alongside many other stars. Planet formation and star formation occur simultaneously, and therefore the birth environment of stars will shape the formation of planets. Properties of the present day Solar System hint to a past in which the Sun formed in the presence of many …
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Connecting models and observations of disc evolution and planet formation
Planets are assembled in and inherit their properties and composition from gas- and dust-rich discs orbiting young stars. Over the last decade, the Atacama Large Millimeter/submillimeter Array revolutionised our understanding of planet formation, opening up the possibility of determining the …
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Planet formation and evolution in our Solar System and beyond
The discovery of thousands of exoplanets in recent decades has revealed a remarkable diversity of planetary system architectures, including entire classes of planets for which there is no solar system analog. In particular, the Kepler mission has shown that planets intermediate in size between …
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Numerical simulation of the final stages of terrestrial planet formation.
… Institute of Technology. Dept. of Earth and Planetary Science.
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THE IMPACT OF TRIPLE STELLAR SYSTEMS ON PROTOSTELLAR DISC DYNAMICS
… to develop 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 …
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Streaming Instabilities in Class 0/I Disks
<p>While it is clear that planets form in protoplanetary disks, fragmentation and the radial drift of pebbles inhibit the growth of grains to planetesimals. To overcome these barriers, effective localized dust clumping on a short enough time scale is required. One promising solution to this problem …
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Describing protostellar disk structure in Ophiuchus
… millimeter observations of disks at the protoplanetary stage reveal substructures such as gaps, rings, arcs, spirals, and cavities. These structures are often attributed to disturbances from young, newly formed planets or mechanisms conducive to planet formation. However, the formation …
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Binary star systems and extrasolar planets
For ten years, planets around stars similar to the Sun have been discovered, confirmed, and their properties studied. Planets have been found in a variety of environments previously thought impossible. The results have revolutionized the way in which scientists understand planet and star formation …
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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 …
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Magnetic Fields in Protoplanetary Discs
Protoplanetary discs are flattened discs of gas and dust surrounding young stars that are believed to be the sites of planet formation. They are believed to be threaded by large-scale magnetic fields, which significantly affect their dynamics through processes such as the magneto-rotational …
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Characterization of Radio Emission from Young Stellar Objects
The discovery and characterization of planetary systems have been a prime focus in the field of astronomy for the past few decades. However, in spite of such collective interest and efforts, there still remain many under-explored paths, such as in the realm of star and planet formation. …
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A Global Hydrodynamic Investigation into the Transport of Material in Protoplanetary Discs
Recent advancements in planet formation theory have highlighted pebble accretion as a crucial process, offering a solution to the meter-sized barrier in dust growth and significantly reducing timescales in core accretion models. This efficient growth mechanism enables the formation of massive …
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The formation and evolution of planetary systems
… and other 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 …
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Probing planetary disks: from birth to protoplanets
Protoplanetary disks set the physical and chemical conditions for the planets that will eventually form inside of them. While the exact details of the process remain a large area of research, it is the gas and dust in these disks that will grow into planets. By the Class II phase of a protostar’s …
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Planetesimal and Protoplanet Dynamics in a Turbulent Protoplanetary Disk
In a young protoplanetary disk, planetary objects undergo orbital migration due to the gravitational torques exerted by their surrounding gas. It has been an outstanding issue that an earth-sized planet embedded in a gas-rich environment may rapidly migrate into its host star. In this dissertation, …
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Spectro-astrometry as a Tool for Detecting Planets in Transitional Disks
… an ever-growing population of extra solar planets orbiting stars of many different sizes and temperatures. It is much easier to detect a large planet that orbits close to its star as opposed to a smaller, more distant one. This led to the discovery of many Hot-Jupiters in the initial stages …
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A matter of life and death: the formation and destruction of planetary bodies
Since the discovery of the first exoplanets in the 1990s, our knowledge of planets has expanded far beyond the Solar System, and surveys like Kepler and Tess have revealed a huge diversity of other worlds. In response to this new information, a novel field of planetary astronomy has sprung up to …
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Experimental Constraints on Melting Processes in the Earth and Small Rocky Bodies
… equilibrium experiments. The implications for planet formation models of a differentiated moon-sized planetesimal accreting in the first 3 Ma of the Solar System are also discussed. In the fourth Chapter, I introduce a new experimental technique for studying melt migration in volcanoes, which …
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