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 28 for “"extrasolar"”.
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Tidal Dissipation in Extrasolar Planets
Many known extra-solar giant planets lie close to their host stars. Around 60 have their semi-major axes smaller than 0.05 AU. In contrast to planets further out, the vast majority of these close-in planets have low eccentricity orbits. This suggests that their orbits have been circularized likely …
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Binary star systems and extrasolar planets
… is used as the basis for a new program to find extrasolar planets. The Palomar High-precision Astrometric Search for Exoplanet Systems (PHASES) is a search for giant planets orbiting either star in 50 binary systems. The goal of this search is to detect or rule out planets in the systems …
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Retrieval of atmospheric properties of extrasolar planets
We present a new method to retrieve molecular abundances and temperature profiles from exoplanet atmosphere photometry and spectroscopy. Our method allows us to run millions of 1-D atmosphere models in order to cover the large range of allowed parameter space. In order to run such a large number of …
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The stability of short-period extrasolar giant planets
… coupled thermosphere-ionosphere model for extrasolar giant planets (EXOTIM) has been developed. This is the first such model reported in the literature. This thesis contains an extensive description of the model and the methods adopted in modelling the different physical processes expected …
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Gravitational microlensing and the search for extrasolar planets
This project is aimed at tackling binary gravitational microlensing events. Since the early conception of gravitational lensing before Einstein’s General Theory of Relativity, physicists and astronomers of the early 18th century speculated that light, if treated as particle, can be affected by …
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The Structure of Extrasolar Planetesimal Belts in Images
Solid bodies in the form of planets and planetesimal belts familiar to us in the Solar System are also a prevalent feature around other stars. Their great diversity highlights a lack of complete theories for how they formed, which is further complicated by observational challenges to understand …
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Extrasolar planet transit photometry at Wallace Astrophysical Observatory
Extrasolar planet transit photometry is a relatively new astronomical technique developed over the past decade. Transit photometry is the measurement of a star's brightness as an orbiting planet passes in front of the star as seen from the Earth. Recently, members of MIT's Planetary Astronomy Lab …
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Detecting Extrasolar Planets using IFS-based Simultaneous Differential Imaging
Observations of extrasolar planets using Integral Field Spectroscopy (IFS), if coupled with an extreme Adaptive Optics system and analyzed with a Simultaneous Differential Imaging technique (SDI), are a powerful tool to detect and characterize planets directly; they enhance the signal of the planet …
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Polluted White Dwarfs: Insights into Ancient Extrasolar Planetary Systems
As the study of rocky exo-planets enters an era of characterisation, the ability to determine how similar a planet is to the Earth, and thus if it is potentially habitable, is fast approaching. An understanding of the geological processes which determine a rocky world’s bulk composition, …
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A transit-timing variation study of the extrasolar planet TrES-3
… to observe five stellar transit events of the extrasolar planet TrES-3 [5]. Model light curves are fit to the five data sets and transit midtimes are determined. Midtimes obtained in this study, along with midtimes reported by Sozzetti et al. (2008) [8], are compared to the ephemeris of the …
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The role of binary stars in searches for extrasolar planets by microlensing and astrometry
When Galactic microlensing events of stars are observed, one usually measures a symmetric light curve corresponding to a single lens, or an asymmetric light curve, often with caustic crossings, in the case of a binary lens system. In principle, the fraction of binary stars at a certain separation …
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Magnetic Coupling between a “Hot Jupiter” Extrasolar Planet and Its Pre-Main-Sequence Central Star
… order to understand the short-period pile-up of extrasolar planets, the magnetic torque of a pre-main-sequence 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 …
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Tidal interactions between planets and stars
Since the first discovery of an extrasolar planet around a solar-type star, observers have detected over 500 planets outside the solar system. Many of these planets have Jovian masses and orbit their host stars in orbits of only a few days, the so-called “Hot Jupiters”. At such close proximity to …
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Courting Serendipity: The Search for Transient Radio Signals
… of a search for cyclotron maser emission from extrasolar planets. Extrasolar planets are likely emitters of non-thermal radio emission analogous to the bursting radio emission observed from all five of our solar system's magnetized planets. Four planetary systems were observed at the Arecibo …
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An analysis of the sensitivity of a low pressure time projection chamber to a directional anisotropy due to WIMP interactions
… evidence that these incident particles have an extrasolar origin. In this thesis I discuss the workings of a TPC known as the 4-shooter, the analysis used to identify nuclear recoil candidates, and the mathematics to quantify the anisotropy of a distribution. I then discuss the ways in which the …
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An analysis of noise in the CoRoT data
… satellite mission CoRoT, designed to seek out extrasolar planets, was analyzed using MATLAB. CoRoT attempts to observe the transits of these planets across their parent stars. CoRoT occupies an orbit which periodically carries it through the Van Allen Belts, resulting in a very high level of …
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Magnetic interaction of super-Earths with their host star and planet composition
… the planet-star interactions of super Earths, extrasolar planets with masses between 1 and 10 times the mass of the Earth. We first present a model of the magnetic field of a super Earth, the dynamo model. We then list and explain several mechanisms through which magnetic energy can be …
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Exoplanetary system WASP-3 : measurement of the projected spin-orbit angle and evidence for stellar activity
… photometric observations of WASP-3, a transiting extrasolar planetary system. From spectra obtained during two transits, I use the Rossiter-McLaughlin effect in a simplified physical model to determine the projected spin-orbit angle between the planetary orbital axis and the stellar rotation axis, …
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