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 “"Exoplanet Atmospheres"”.
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Characterising Exoplanet Atmospheres with High-Resolution Transmission Spectroscopy
Over 5000 exoplanets have been discovered in the last three decades, revealing a truly diverse population of worlds beyond our solar system. The field has accelerated rapidly towards characterising the atmospheres of exoplanets around the nearest and brightest stars with large observational surveys …
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Isotopes as a Tool for Exploring Exoplanet Atmospheres
… this thesis, I evaluate how we can characterize exoplanet atmospheres using isotopologues. I also extend this to the detectability of novel biosignature gases by way of carbon isotope ratios. I evaluated the detectability of ¹³CO₂ in the atmospheres of temperate terrestrial and sub-Neptune sized …
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Towards Generalized Characterization of Exoplanet Atmospheres with Transit Spectroscopy
The field of exoplanetary sciences has grown from an era of detection to one of characterization. To date, over 4000 exoplanets have been discovered and over 50 of them have been observed with primary transit spectroscopy methods. The current population of characterized exoplanets spans a wide …
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Characterizing Exoplanet Atmospheres: From Light-curve Observations to Radiative-Transfer Modeling
… to probe the thermo-chemical properties of exoplanets. Although the large planet-to-star brightness contrast and few available spectral bands produce data with low signal-to-noise ratios, a Bayesian approach can robustly reveal what constraints we can set, without over-interpreting the data. …
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Thermal and Radiative Properties of Exoplanet Atmospheres Across the Mass Range
Observations of exoplanet atmospheres have flourished in recent years, revealing a remarkable diversity of thermal, chemical and dynamical conditions. In particular, thermal emission observations of such atmospheres provide unique insights into their temperature profiles, chemistry and energy …
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Planetary Science Meets Chemistry: Studying Potential Biosignature Gases in Terrestrial Exoplanet Atmospheres
As more and more exoplanets are discovered, searching for biosignature gases is becoming one of the crucial ways to find extraterrestrial life. Biosignature gases are gases produced by living organisms that can accumulate to detectable levels in the atmosphere. Once detected, it can be attributed …
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Planetary Systems in Polarized Light: Debris Disk Observations and Instrumentation
… for imaging debris disks and characterizing exoplanet atmospheres. With that in mind, this thesis has been constructed with two main aspects: i) observational studies of two debris disk systems, Beta Pic and HD 157587, using the Gemini Planet Imager and ii) the characterization and testing of …
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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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Exoplanet Atmospheric Characterization using High-Precision Photometry
The field of Exoplanet is rapidly maturing hour by hour. With present and future proposed telescopes, our understanding of alien worlds is going to get much more profound. The main focus of my thesis is the study of spectral signatures in Photometric observations of exoplanets both in optical and …
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New Advances in Exoplanet Spectroscopy from Space and Ground
Thousands of exoplanets have been discovered over the last thirty years, providing key insights into the population of planets in the galaxy. Today, atmospheric characterisation of these distant worlds is at the forefront of exoplanet science, with new observational capabilities revolutionising …
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Revealing the Nature of Exoplanetary Atmospheres
The study of planets orbiting other stars, exoplanets, has entered the era of characterisation. When an exoplanet passes in front, or transits, its parent star, absorption features are imprinted into starlight passing through the planetary atmosphere. By analysing the resultant transmission …
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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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Probing the atmospheres of transiting exoplanets using ground-based multi-object spectroscopy
The field of exoplanetary science, the study of planets around stars other than the Sun, has undergone rapid expansion over the last few decades, with over 4000 confirmed exoplanets now known. With a wealth of favourable targets identified, it has recently become possible to begin to characterise …
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Bayesian atmospheric retrieval for exoplanets : uniqueness of exoplanet spectra, characterizations of super-earths, and evaluations of dedicated space telescope designs
… orbiting stars other than the sun, so-called exoplanets. Recent statistical studies based on 800 confirmed planets and more than 3000 planet candidates suggest that our galaxy is teeming with billions of planets. Many of them are likely to orbit their host stars at a distance where liquid …
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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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SHEDDING NEW LIGHT ON OLD DATA: FINDING NEW RESULTS FOR EXOPLANET SCIENCE IN ARCHIVAL DATA
… use them to find limitations in the modelling of exoplanet atmospheres due to pressure broadening. Pressure broadening, where collisions between molecules in atmospheres cause a Lorentzian broadening of molecular transitional lines, is little understood in the field. In this chapter I consider its …
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A multi-parameter approach to exoplanet habitability
… to remotely detect potential biosignatures in exoplanet atmospheres and discover signs of life beyond our Solar System. To make the most of the limited observational resources available, target selection has focused on 'habitable worlds' defined as rocky bodies orbiting their host stars at a …
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A multi-parameter approach to exoplanet habitability
… to remotely detect potential biosignatures in exoplanet atmospheres and discover signs of life beyond our Solar System. To make the most of the limited observational resources available, target selection has focused on 'habitable worlds' defined as rocky bodies orbiting their host stars at a …
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Molecular Characterisation of Exoplanetary Atmospheres using High-Resolution Transmission Spectroscopy
Exoplanetary science has entered an exciting new age of studying lower-mass exoplanets, with atmospheric characterization emerging as the frontier of this revolution. Whilst JWST has dominated the spotlight in recent years, high-resolution spectrographs on large ground-based telescopes are powerful …
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