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 49 for “"Neptune"”.
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Occultation studies of Neptune
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1984.
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Internal Structures in the Sub-Neptune Regime
Sub-Neptune planets have been shown to be common among the exoplanet popula- tion. The sub-Neptune regime, spanning ∼1-4 Earth radii, encompasses a diverse possible range of planetary conditions, with no analogue in our solar system. The bulk properties of these planets give rise to compositional …
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The interaction of Neptune with the solar wind
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1993.
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Formation, structure and habitability of super-Earth and sub-Neptune exoplanets
… measured masses and radii of super-Earth and sub-Neptune exoplanets, employing models to constrain the planets' bulk compositions, formation histories, and habitability. We develop a model for the internal structure of low-mass exoplanets consisting of up to four layers: an iron core, silicate …
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Statistical analyses of exoplanetary systems and individual studies of the atmospheres of two sub-Neptune-sized planets
… - planet occurrence rates and atmospheres of sub-Neptune-sized planets - through three major projects and one ongoing work. The first project is a uniform spectroscopy analysis of over 700 Kepler target stars, which disproves the popular hypothesis that the discrepancy between close-in gas giant …
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The Observational Diversity of sub-Neptunes
… focuses on characterizing the atmospheres of sub-Neptunes (planets larger than Earth but smaller than Neptune), the most common exoplanets in the galaxy. With no examples in our own Solar System, we are limited to the data quality of remote-sensing capabilities. I aim to unveil the atmospheres of …
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Evaluación agronómica de nueve híbridos de cebolla (Allium cepa (L.) Cif) en el valle de Sébaco, Matagalpa
… ojas en 9 híbridos fueron significativos: Arad, Neptune, Martin, Noam. Amazone y Appolo = 6 Hojas respectivamente, y Russel, Equanex y Galil con = 5 hojas respectivamente . Altura de plantas en híbridos fueron significativos: Noam, Equane x, Martin y Arad = 60 cm respectivamente ; Neptune, …
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Gravity-assist trajectories to Venus, Mars, and the ice giants: Mission design with human and robotic applications
<p>Gravity-assist trajectories to Uranus and Neptune are found (with the allowance of impulsive maneuvers using chemical propulsion) for launch dates ranging from 2024 to 2038 for Uranus and 2020 to 2070 for Neptune. Solutions are found using a patched conic model with analytical ephemeris via the …
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Revealing the Nature of Exoplanetary Atmospheres
… from a recent impact, in the atmosphere of a Neptune-mass exoplanet. Finally, looking to the future, I examine the ability of the upcoming James Webb Space Telescope to probe the atmosphere of a Neptune-mass exoplanet in unprecedented detail. These results offer extraordinary promise for the …
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Internal and atmospheric structures of heated watery super-Earths
… masses lie somewhere between those of Earth and Neptune. We would like constraints on their composition to investigate whether they are more similar to rocky Earth or gaseous Neptune. To do this we need numerical models of their interiors. Such models often exclude any thermal effects, a choice …
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Molecular Characterisation of Exoplanetary Atmospheres using High-Resolution Transmission Spectroscopy
… However, using simulations of the temperate sub-Neptune TOI-732 c, we show that planetary signals in transit may indeed be recovered when the change in the planet’s radial velocity is very small, down to subpixel velocities. We additionally explore novel metrics for finding such signals, and …
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Planet formation and evolution in our Solar System and beyond
… planets intermediate in size between Earth and Neptune with orbital periods less than 100 days are abundant in our galaxy. Concurrently, spacecraft missions to small primitive bodies in our solar system have yielded valuable insights into conditions in the early solar system. This thesis …
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The impacts of atmospheric radiation on studies of planetary habitability
… work quantifies the impinging X-ray flux on sub-Neptune sized planets in the Kepler spacecraft dataset. This study determines the conditions for such planets to be stripped of their primordial atmospheres, with implications for the stability of liquid water on their surfaces. In the second part, …
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A study of binary Kuiper Belt objects
… reside in the Kuiper Belt, beyond the orbit of Neptune. Since 1992 observational surveys have discovered over one thousand of these objects, believed to be fossil remnants of events that occurred nearly 4.5 billion years ago. Sixteen of these objects are currently known to be binaries, and many …
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Ah New Riddim: A Marked (Black) Axiological Shift Across Space and Time
Can the axiologies and stories oscillating the margins mark the discourse of Western logic positioned at the center, and how might this marking register in visual representations of the urban? Focusing on the West Indian community of East Flatbush, this thesis argues for the turn from the universal …
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Colors of Kuiper Belt objects : the relationship between KBO colors and Kuiper Belt plane inclination
… of small, icy bodies orbits the sun just beyond Neptune, known as the Kuiper Belt. These objects, thought to be the progenitors of short period comets, could provide a sample of primordial material in our solar system, constraining solar system formation models. The colors of Kuiper belt objects …
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The origin and evolution of Transneptunian binaries
… objects are icy bodies beyond the orbit of Neptune. A large fraction are found in binary pairs, up to ~30% in the Cold Classical population, which generally have components of similar size and colour on widely separated orbits. Understanding what mechanisms have lead to the formation of such …
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Interplanetary mission design with applications to guidance and optimal control of aero-assisted trajectories
… found for aerocapture maneuvers at Uranus and Neptune. With a large radius, and short rotational periods, atmospheric rotation must be taken into account to accurately model the system dynamics.</p> <p>Investigation of the 2018 Inspiration Mars free-return opportunity is conducted. A broad …
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