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Showing 1 to 14 of 14 for “"Hot Jupiter"”.
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Ground-based transmission spectroscopy of three inflated Hot Jupiter exoplanets
… performed transmission spectroscopy by spectrophotometry of three Hot Jupiter exoplanets. When we began the work on this thesis, optical transmission spectra have been available for two exoplanets. Our main goal was to advance the current sample of probed objects to learn by comparative …
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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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Magnetic Coupling between a “Hot Jupiter” Extrasolar Planet and Its Pre-Main-Sequence Central Star
… central star on a single orbiting "hot Jupiter" planet is calculated. The star's magnetic field is modeled as a dipole magnetic field. The time-dependent stellar radius is calculated for four different stellar mass sizes; <em>2M</em><em>sum </em><em>\.5M</em><em>sum</em> …
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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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Investigating the Characteristics of Exoplanetary Atmospheres and Interiors
… the properties of a wide range of planets, from hot Jupiters to temperate mini-Neptunes. I conduct an assessment of the feasibility of supervised machine learning as a tool to carry out atmospheric retrievals of exoplanets. Retrieval methods commonly conduct Bayesian parameter estimation and …
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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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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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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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Revealing the Nature of Exoplanetary Atmospheres
… nitrogen chemistry (NH$_3$ and HCN) in hot Jupiter atmospheres, the first detection of titanium oxide (TiO) in an exoplanetary atmosphere, and evidence of metal hydrides, possibly from a recent impact, in the atmosphere of a Neptune-mass exoplanet. Finally, looking to the future, I …
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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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Planet formation and evolution in protoplanetary disc
… to be around 1-10 AU, disfavouring the idea of hot Jupiter formation through Type II migration in the planet-dominated regime.
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Characterising Exoplanet Atmospheres with High-Resolution Transmission Spectroscopy
… detections in the transmission spectrum of a hot Jupiter. Next, I explore the diversity of ten highly irradiated giant exoplanets with equilibrium temperatures ranging from around 1000 to 4000 K. I conduct a homogeneous survey of sodium absorption using high-resolution transmission spectra …
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New Advances in Exoplanet Spectroscopy from Space and Ground
… across a diverse range of exoplanets, from hot Jupiters to temperate sub-Neptunes with no counterpart in the Solar System. Together, these advancements promise to transform our understanding of exoplanets and help us contextualise our place within the broader universe. Given these …
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Toward detection and characterization of exoplanetary magnetic fields via low frequency radio observation
… emission is predicted. In the case of eccentric hot Jupiter HD 80606 b, radio flux from the planet is expected to increase by a factor of up to 3000 compared to the quiescent flux as the planet passes within 6 Rof its host at periastron due to high density stellar wind impinging on HD 80606 b's …