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 27 for “"hot Jupiters"”.
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The search for orbital decay in hot Jupiters
We summarize our results, so far, in the search for orbital decay in exoplanets. Orbital decay is the gradual shrinkage of the planetary orbit due to tidal dissipation. We ranked currently known exoplanetary systems according to the theoretical orbital decay rate and trimmed the list down to 12 …
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The creation and use of a chemical kinetics code to model and understand the atmospheres of hot Jupiters
… oxygen, carbon, and nitrogen chemistry in hot Jupiters to produce abundance profiles of the planets’ atmospheres. We perform extensive testing of Levi to ensure its accuracy, including investigations of how both the boundary and initial conditions of the model could affect the final result, …
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Orbital decay of hot Jupiters : coefficients of nonlinear tidal coupling as a function of the stellar host type
Hot Jupiters raise strong tides in their host stars due to their large masses (around a Jupiter mass) and tight orbits (orbital periods P </~ 3 days). These tides remove orbital energy and angular momentum, causing the planet's orbit to decay. The rate of decay depends on the detailed structure of …
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Near-infrared Characterization of the Atmospheres of Alien Worlds
… of the thermal emission of a number of hot Jupiters and likely transit depth differences from different wavelength observations of a super-Earth. I have pioneered ``Staring Mode'' using the Wide-field Infrared Camera on the Canada-France-Hawaii Telescope to achieve the most accurate …
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New Avenues in Atmospheric Modelling of Exoplanets
… been seen on the dayside atmospheres of some hot Jupiters and have been predicted to be caused by TiO or VO due to their visible opacity. I used the GENESIS model to investigate the effect of visible opacity and deduced that many new species (AlO, CaO, NaH and MgH), hitherto unexplored, are …
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High resolution Doppler spectroscopy of a transiting ultra-hot Jupiter at optical wavelengths
… the huge, high-temperature exoplanets known as hot Jupiters are fascinating laboratories for extreme atmospheric physics, and their size, translucent atmospheres and proximity to their host stars makes them excellent targets for characterisation through transmission spectroscopy. Recently, …
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Elucidating the evolution histories of giant planets with K2 and TESS
… How do close-in giant planets -- the so-called "hot Jupiters" --
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Thermal and Radiative Properties of Exoplanet Atmospheres Across the Mass Range
… profiles and thermal emission spectra of hot Jupiters, including thermal inversions in their dayside atmospheres. In particular, TiO has long been proposed to cause thermal inversions in hot Jupiters and its spectral features in the optical and near-infrared have been detected. I …
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Towards Generalized Characterization of Exoplanet Atmospheres with Transit Spectroscopy
… a wide range of parameter space; from ultra-hot Jupiters with atmospheric temperatures beyond 3000 K, to temperate mini Neptunes that may host water in their atmospheres. Upcoming observational facilities in the next two decades will deliver exquisite spectra of exoplanet atmospheres at …
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Detectability of dynamical tidal effects and the detection of gravitational-wave transients with LIGO
… interactions within two very different systems: hot Jupiters orbiting main-sequence hosts with radiative cores and compact stellar remnants inspiraling due to gravitational radiation. In addition, it discusses general aspects of detecting Gravitational Waves with ground-based laser …
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Chemical Characterisations of Exoplanetary Atmospheres
… retrieval method to the spectra of ten hot giant exoplanets and, for the first time, provide detailed statistical estimates of atmospheric properties for a size-able exoplanet sample with broadband data. Our analysis reveals a trend of low abundances of water vapour in the hot Jupiter …
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Probing the atmospheres of transiting exoplanets using ground-based multi-object spectroscopy
… I present ground-based observations of three hot Jupiters which I modelled using Gaussian processes, a technique which allows me to robustly disentangle the planetary signals from the systematic noise. In addition, I introduce Student’s-T processes for exoplanet time-series, which are a …
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Enshrouded Exoplanetary Systems
… values. The activity index of the known Hot Jupiter hosts WASP-43, WASP-51/HAT-P-30, WASP-72 & WASP-103 was measured to search for anomalous values caused by the companions. The activity level of WASP-43 is extremely high in absolute terms and relative to its age and X-ray emission. The …
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Telescopes and Techniques for the High-Resolution Characterisation of Exoplanets
… from analysing high-resolution spectra of three hot Jupiters – HD 209458b, HD 189733b and 51 Pegasi b. Evidence for H2O, CO and of HCN was found in all three datasets – the latter molecule had not previously been found in an exoplanet atmosphere. These studies used HRDS analysis techniques common …
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Maps and masses of transiting exoplanets : towards new insights into atmospheric and interior properties of planets
… and the first cloud map of an exoplanet for the hot-Jupiters HD 189733b and Kepler-7b, respectively. The second method, MassSpec, aims to determine transiting planet masses and atmospheric properties solely from transmission spectra, i.e. the starlight filtered by a planet's atmosphere during …
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Turbulence and Transport in Stars and Planets
… vein I examined the convection zones of bloated hot Jupiters and discovered a novel feedback mechanism between non-equilibrium tidal dissipation and the thermal structure of their upper envelopes. This mechanism stabilises shallow radiative zones against the convective instability, which would …
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Observations, Thermochemical Calculations, and Modeling of Exoplanetary Atmospheres
… aims to provide the means to better understand hot-Jupiter planets through observing, performing thermochemical calculations, and modeling their atmospheres. We used Spitzer multi-wavelength secondary-eclipse observations to characterize planetary atmospheres. We chose targets with high …
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Characterization of exoplanetary systems combining transit timing techniques and radial velocities: From secular perturbations to resonant chains
… I first explored tidal orbital decay in ultra-hot Jupiters through the analysis of WASP-12 b, using 12 years of ground-based photometry to confirm its decreasing orbital period while revealing intriguing discrepancies that challenge our understanding of stellar evolution and tidal dissipation. …
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Tidal interactions between planets and stars
… in orbits of only a few days, the so-called “Hot Jupiters”. At such close proximity to their parent stars, strong tidal interactions between the two bodies are expected to cause significant secular spin-orbit evolution. This thesis tackles two problems regarding the tidal evolution of …
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Understand thy star, understand thy planet
… are detected by presenting the discovery of two hot Jupiters by NGTS. Following this discovery, I investigate how to detect smaller exoplanets using our best example: the Sun. Using the HARPS-N solar telescope, I study the possibility of detecting Venus using the RV method. However, finding Venus …
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