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 26 for “"James Webb space telescope"”.
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Analysis of Molecular Variability Due to Accretion Bursts in the Protoplanetary Disk of Ex Lup as Observed with the James Webb Space Telescope
… outburst to study the postburst evolution. Using James Webb Space Telescope Mid-Infrared Instrument (MIRI) Cycle 1 programs GO-2209 and GO-4427 (PI: Peter Ábrahám, Co-I: Andrea Banzatti), mid-IR observations of EX Lup after the 2008 outburst were conducted in August 2022 and April 2023, following …
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Addressing deep uncertainty in space system development through model-based adaptive design
When developing a space system, many properties of the design space are initially unknown and are discovered during the development process. Therefore, the problem exhibits deep uncertainty. Deep uncertainty refers to the condition where the full range of outcomes of a decision is not knowable. A …
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Exoplanetary Systems in Technicolor
… photometry afforded by instruments such as the James Webb Space Telescope. With increased precision, longer baselines of observation, and access to multi-instrument data sets, the study of exoplanets has reached a level of detail never before possible. In this thesis, I focus on the analysis of …
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SPECTROSCOPIC STUDY OF ICES WITH ASTROPHYSICAL INTEREST
… of observations of ices present in interstellar space and in outer solar system bodies. Furthermore, I studied the self-diffusion of CO2 isotopes in different thin-film arrangements. Mid-IR laboratory data of the morphological change of CH4, CH4-volatile mixture, and CO2 during thermal processing …
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Formation of the first galaxies under stellar feedback
… observability of such system with the upcoming James Webb Space Telescope (JWST).
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The Rise and Fall of Star-Forming Clumps: Formation and Evolution of the Building Blocks of Galaxies Across Cosmic Time
… Using GNIRS spectroscopy from the Gemini-North telescope, we measure gas-phase metallicities for a small sample (<30) of clumpy and nonclumpy galaxies. We find that clumpy galaxies exhibit systematically lower metallicities relative to the mass–metallicity relation, consistent with clump …
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Revealing the Nature of Exoplanetary Atmospheres
… 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 retrieval of atmospheric properties from exoplanet spectra. Planets possessing cloudy skies can …
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Planar feasibility study for primary mirror control of large imaging space systems using binary actuators
… advancements in ground-based observatories and space telescopes. Latest trends in ground-based observatories have been ever increasing size of the primary mirror, providing much higher apertures for more powerful image captures. The same trend can be envisioned for space telescopes. In fact, …
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STRONG GRAVITATIONAL LENSING MODELLING OF GALAXY CLUSTERS IN THE ERA OF BIG DATA
… of massive clusters. Complementarily, the James Webb Space Telescope (JWST) is providing extremely deep and high-resolution observations, revealing a number of multiple images and substructures greater than previously unknown, and thus enabling lens models of unprecedented accuracy. The …
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Modeling and Observing Atmospheres of Terrestrial Exoplanets
The recent launch of the James Webb Space Telescope (JWST) allows us to observe more exoplanets and in greater detail. Now that we can characterize terrestrial planets and their atmospheres, this dissertation features several theoretical works that study atmospheric dynamics and infer …
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Deployment and on-orbit shape modifications for a large space telescope using magnetostriction
The Hubble Space Telescope, with its 2.4-m primary mirror, enabled notable scientific progress and discoveries, like for instance the acceleration of the expansion of the universe. Twenty-six years later, NASA is about the launch the next generation of space telescopes, namely the James Webb Space …
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Bridging infrared and visible light with nano-optics
… the birth of stars by peering deeper into space than ever before with the James Webb Space Telescope. However, the detection of IR photons presents significant challenges, with existing technologies being inefficient, prohibitively expensive, and impractical. To overcome these limitations, …
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Constrained Motion Analysis of Spacecraft Trajectory in Restricted Three Body Problem
… maintained on their desired trajectory. Indian space research organization has planned to launch the Aditya-L1 spacecraft to study about the Sun by 2021. James Webb Space Telescope has also been designed to observe deep space at L2 in the Sun-Earth system by 2021. The combined gravity of the …
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Maps and masses of transiting exoplanets : towards new insights into atmospheric and interior properties of planets
… atmospheric properties. Utilizing MassSpec, the James Webb Space Telescope (launch date: 2018) could determine the mass and atmospheric properties of half a dozen Earth-sized planets in their host's habitable zones over its lifetime, which could lead to the first identification of a habitable …
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Regulating and Quenching Star Formation in Galaxies across the Cosmic Epochs
… Using groundbreaking data from the James Webb Space Telescope (JWST), I identify an extremely rapidly “(mini-)quenched” galaxy at redshift z=7.3, when the universe was only 700 million years old. Its star-formation history (SFH) consists of a short and intense burst terminating only …
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Hunting Supermassive Black Holes in the Early Universe
… the next generation Rubin Legacy Survey of Space and Time (LSST) and Roman High-Latitude Wide Area Survey (HLWAS). We extend current empirical simulation of quasars and contaminants, low-redshift red galaxies and galactic cool dwarfs, to the surveys limit. We studied the optimal selection, …
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Optimising the Detection of Temperate, Terrestrial Planets around Ultra-Cool Dwarfs with SPECULOOS
… for future atmospheric characterisation by the James Webb Space Telescope (JWST). For this thesis, I focused on removing both the astrophysical and non-astrophysical sources that limit the detection of rocky planets and on constraining these planets’ frequency. Firstly, I developed the SSO …
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Exoplanetary Atmospheric Retrievals with Transit Spectroscopy in the JWST Era
… histories and even the presence of life. The James Webb Space Telescope (JWST) has already led to the first of likely many breakthroughs with novel chemical detections. These expected advances in exoplanetary science in the JWST era necessitate atmospheric retrieval techniques to evolve to …
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New Advances in Exoplanet Spectroscopy from Space and Ground
… remote sensing of exoplanets. The James Webb Space Telescope (JWST) is delivering unprecedented atmospheric observations with unmatched precision and wavelength coverage in the infrared, while large ground-based telescopes are facilitating high-resolution spectroscopy in the optical …
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New insights into primeval galaxies in the era of JWST
… broader reionisation process. While the Hubble Space Telescope (HST) was able to identify a small sample of candidate z>7 galaxies, the James Webb Space Telescope (JWST) has revolutionised the field. The sensitivity of the near infrared camera (NIRCam) and spectrograph (NIRSpec) instruments have …
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