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 122 for “"exoplanets"”.
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The properties of transiting exoplanets
… I estimated the number of potentially habitable exoplanets within the Earth’s transit zone, finding that approximately ten would be currently detectable. <br/><br/>I then carried out a transit search for these planets, plus other interesting systems, using data from the Kepler-K2 mission which …
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Modeling and Observing Atmospheres of Terrestrial Exoplanets
… 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 observability. First, we explore the processes …
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New Avenues in Atmospheric Modelling of Exoplanets
… aspects of atmospheric characterisation of exoplanets with the primary goal of understanding their chemical compositions and physical processes. My research led to the development of new self-consistent models of exoplanetary atmospheres, a new paradigm for atmospheric retrievals of thermal …
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Investigating Exoplanets and Transients Using Small-Aperture Telescopes
… from a form of residual image. Regarding exoplanets, PIRATE has helped to identify 108 false positives as well as 24 real and plausible planets. Combined, this is 67% of PIRATE’s total exoplanet candidate observations. Several of these targets are explored in further detail. Still on the …
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Atmospheric Mass Loss And Orbital Evolution Of Exoplanets
… comparing the observed distribution of close-in exoplanets with the hypothetical population, modeled under different ε and Q'* conditions, these values are tested. Under all conditions the two populations were statistically dissimilar, indicating that the population was either not initially …
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Identifying Exoplanets and Unmasking False Positives with NGTS
… decrease in brightness. The study of transiting exoplanets gives insight into their size, formation, bulk composition and atmospheric properties. Transit surveys are limited by their ability to identify false positives, which can mimic planets and out-number them by a hundredfold. First, I …
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Detection and Characterization of Hot Super-Earth Exoplanets
Hot super-Earths are exoplanets characterized by short orbital periods and surface temperatures high enough to melt silicate rock. These planets lack any solar system analog, and are the most accessible small, rocky exoplanets available to study today. In this thesis, I develop a holistic …
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Late accretion to the early Earth and rocky exoplanets
The final stages of Earth's formation were characterised by the violent collisions of planetesimals, asteroids and comets -- by-products of the primary stage of planet formation -- with the nascent planet. It is thought these impacts, delivering vast sums of energy, may have transformed surface …
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Measuring transit timing variations of exoplanets using small telescopes
Transits of exoplanets were observed from June 2009 through January 2010. Six transit light curves are presented in this paper for three planets: WASP-10b, WASP- 11/HAT-P-10b, and TrES-3. Measurements of the planetary radii, semi-major axis, transit duration, and period confirmed literature values …
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Photometry and transit-timing analysis for eleven transiting exoplanets
This thesis presents time-series photometry of transits of 11 different extrasolar planets. Observations were conducted with the Fred L. Whipple Observatory 1.2m telescope and the Wise Observatory im telescope, in standard optical bandpasses. The number of transits observed for each planet ranges …
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Ground-based transmission spectroscopy of three inflated Hot Jupiter exoplanets
The characterization of exoplanets is a young and rapidly expanding field in astronomy. It includes a method called transmission spectroscopy that searches for planetary spectral fingerprints in the light received from the host star during the event of a transit. This techniques allows for …
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Telescopes and Techniques for the High-Resolution Characterisation of Exoplanets
… of research relating to the characterisation of exoplanets in high resolution. The first investigates high-resolution Doppler spectroscopy (HRDS) – a technique for detecting chemical species in exoplanet atmospheres. I present results from analysing high-resolution spectra of three hot Jupiters – …
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Detectability of biosignature gases in the atmospheres of terrestrial exoplanets
Biosignature gases in the atmosphere of an exoplanet provide a means by which we can deduce the possible existence of life on that planet. As the list of possible biosignature gases is ever growing, the need to determine which molecules provide the best opportunities for detection grows as well. …
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Adaptive Wavefront Estimation Algorithms for High-Contrast Imaging of Exoplanets
The direct imaging of exoplanets orbiting stars outside our solar system remains one of the crucial tools we have available to answer whether there exists life beyond Earth. The light from an Earth-like exoplanet is approximately ten orders of magnitude dimmer than its host star and hence the …
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Tracing the horizons of habitability with Venus and warm rocky exoplanets
… Solar System; the other via remote sensing of exoplanets that orbit distant stars. Venus, our nearest planetary neighbour in the Solar System, holds unique significance for the limits of habitability on both of these frontiers: first, Venus represents the paradigm of an Earth-like planet that …
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Discovery and Characterisation of Long-Period Exoplanets with TESS and CHEOPS
… and characterisation of long-period transiting exoplanets. Detecting exoplanets via the transit method is inherently biased towards short-period planets. Due to the nature of its observing strategy, the Transiting Exoplanet Survey Satellite (TESS) is particularly susceptible to this detection …
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Atmospheric photochemistry, surface features, and potential biosignature gases of terrestrial exoplanets
The endeavor to characterize terrestrial exoplanets warrants the study of chemistry in their atmospheres. Here I present a comprehensive one-dimensional photochemistry-thermochemistry model developed from the ground up for terrestrial exoplanet atmospheres. With modern numerical algorithms, the …
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Formation, structure and habitability of super-Earth and sub-Neptune exoplanets
… 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 mantle, ice …
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