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Rozprawy doktorskie na temat „Exoplanets”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Baroch, López David. "Analysis of high-precision spectroscopic and photometric data for planet and stellar characterisation." Doctoral thesis, Universitat Autònoma de Barcelona, 2021. http://hdl.handle.net/10803/673657.

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La detecció de la primera estrella binària més de 200 anys enrere va representar l'inici de tot un nou camp de l'astrofísica dedicat a l'estudi de l'evolució i les interaccions d'aquests sistemes, fent servir com a principal eina l'anàlisi del moviment reflex causat pel company orbitant. Va ser només qüestió de temps que els instruments de mesura assolissin un nivell de precisió prou elevat per a detectar els moviments induïts per planetes sobre les seves estrelles. El descobriment del primer exoplaneta fa quasi tres dècades va suposar la creació d'un reguitzell de projectes dedicats a la cerc

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Lafarga, Magro Marina. "Stellar activity and exoplanets ofMdwarfs from CARMENES visible to near-infrared spectroscopy." Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/671618.

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Després del descobriment dels primers exoplanetes fa unes tres dècades, la detecció i caracterització de companys planetaris s’ha convertit en un tema de recerca prominent, especialment la cerca de planetes semblants a la Terra, cossos rocosos que orbiten a la zona habitable (HZ) de les seves estrelles hostes. Un dels principals mètodes utilitzats per trobar i caracteritzar exoplanetes és la tècnica de l’espectroscòpia Doppler o velocitat radial (RV), basada en l’ús d’espectres estel·lars per mesurar canvis periòdics en la RV d’una estrella causats per l’atracció gravitatòria d’un exoplaneta e

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3

Bochinski, Jakub Jaroslaw. "Observations of transiting exoplanets." Thesis, Open University, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.699818.

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The field of exoplanetology has evolved significantly from its beginnings in the 1990s, gradually shifting emphasis from the detection of new exoplanets to characterisation of those already discovered. Simultaneously, considerable progress has been made in the area of automatisation of both instruments and data reduction techniques, leading to an ever-growing influx of new data, discoveries and facts about the planets outside of the Solar System. Observations of transiting exoplanets can be divided into two major themes: surveys, designed to find new planetary candidates; and follow-up observa

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Frith, James Michael. "Towards atmospheric characterisation of exoplanets." Thesis, University of Hertfordshire, 2014. http://hdl.handle.net/2299/14247.

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This thesis provides a multi-pronged approach towards paving the way for future space and ground based exoplanet characterisation e↵orts as well as providing new analysis of the atmosphere of the exoplanet HD 179949 b. This is done, firstly, by outlining engineering trade studies conducted for the attitude and orbit control system (AOCS) and sun shield for the Exoplanet Characterisation Observatory (EChO) spacecraft (a proposed European Space Agency exoplanet space mission). These trade studies were conducted in collaboration with EADS Astrium. A cold gas system with the possibility of a hybri

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5

Svensson, Rebecka. "Exploring the Diversity of Exoplanets." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-87402.

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The search for extrasolar planets had been ongoing for many years when Mayorand Queloz discovered 51 Pegasi b in 1995. It was a giant gas planet similar to Jupiter, but with a larger radius and of only half of Jupiter’s mass. Theso called Hot Jupiter was observed to orbit its host star 7 times closer thanMercury is orbiting the Sun. Theoretical models at the time stated that gasgiants could not form in such a short distance to the host star. Thus, thisdiscovery was completely unexpected. It was the beginning of a new field ofresearch where the diversity of exoplanets is the most remarkable dis

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Brothwell, Rayn David. "The dynamic nature of exoplanets." Thesis, Queen's University Belfast, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.705899.

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7

Pearson, Kyle A., Leon Palafox, and Caitlin A. Griffith. "Searching for exoplanets using artificial intelligence." OXFORD UNIV PRESS, 2018. http://hdl.handle.net/10150/627143.

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In the last decade, over a million stars were monitored to detect transiting planets. Manual interpretation of potential exoplanet candidates is labour intensive and subject to human error, the results of which are difficult to quantify. Here we present a new method of detecting exoplanet candidates in large planetary search projects that, unlike current methods, uses a neural network. Neural networks, also called 'deep learning' or 'deep nets', are designed to give a computer perception into a specific problem by training it to recognize patterns. Unlike past transit detection algorithms, dee

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8

Hodosán, Gabriella. "Lightning on exoplanets and brown dwarfs." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/12079.

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Lightning is an important electrical phenomenon, known to exist in several Solar System planets. Amongst others, it carries information on convection and cloud formation, and may be important for pre-biotic chemistry. Exoplanets and brown dwarfs have been shown to host environments appropriate for the initiation of lightning discharges. In this PhD project, I aim to determine if lightning on exoplanets and brown dwarfs can be more energetic than it is known from Solar System planets, what are the most promising signatures to look for, and if these "exo-lightning" signatures can be detected fro

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9

Georgieva, Iskra. "Searching for Exoplanets in K2 Data." Thesis, Luleå tekniska universitet, Rymdteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70960.

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The field of extrasolar planets is undoubtedly one of the most exciting and fast-moving in astronomy. Thanks to the Kepler Space Telescope, which has given us the Kepler and K2 missions, we now have thousands of planets to study and thousands more candidates waiting to be confirmed.For this thesis work, I used K2 data in the form of stellar light curves for Campaign 15 – the 15th observation field of this mission – to search for transiting exoplanets. I present one way to produce a viable list of planetary candidates, which is the first step to exoplanet discovery. I do this by first applying

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10

Armstrong, David John. "On the abundance of circumbinary exoplanets." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/72676/.

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Circumbinary planets are bodies that orbit both components in a binary star system. This thesis focuses on transits of these planets, which with the aid of the Kepler space telescope have recently led to the discovery of several such objects. First, transit timing variations - departures from strict periodicity in the transit times - are studied. These arise from both the motion of the host stars and relatively rapid precession of the planet’s orbit. Limits on the maximum possible transit timing variation are derived, and tested against N-body simulations of simulated circumbinary systems. The

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11

Waldén, Pierre, and Erik Aronson. "Spectroscopic characterization of transiting exoplanets : A study of the possibility to detect atmospheres around exoplanets using SIMPLE." Thesis, Uppsala universitet, Observationell astrofysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-149020.

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This report describes simulations of observations with the near-infrared high-resolution spectrometer SIMPLE that is proposed to the ESO telescope E-ELT. We simulate M4 and G2 stars with transiting Earth-like planets and the goal is to distinguish spectral features originating from the atmosphere of the exoplanet. Noise levels of different magnitudes are added to the simulations and the minimal signal-to-noise required for detection of the atmosphere is estimated. Our conclusion is that detection of atmospheric features looks promising using this setup.

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12

Ivanova, Anastasiia. "Contributions to the study of exoplanets : improvement of the stars radial velocity measurements, transit spectroscopy modeling." Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPASP147.

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La méthode des vitesses radiales a été la première méthode de détection d'une exoplanète. Depuis 1995, elle a permis de découvrir plus de 2000 exoplanètes et la méthode des RV a ses avantages. Outre la découverte de nouvelles exoplanètes et la détermination de leur masse apparente, elle est utilisée pour confirmer les exoplanètes découvertes par d'autres méthodes et pour mesurer la masse des exoplanètes en transit. Cependant, la méthode RV est limitée par les capacités techniques: la taille et la disponibilité du télescope, la stabilité et la précision de l'étalonnage de la longueur d'onde du

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13

Dragomir, Diana. "Transiting super-Earth exoplanets : search and characterisation." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43616.

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The only way to measure the diameter of a planet outside the Solar System is if it transits its host star. Transit data combined with radial velocity (RV) data give an exoplanet's mass. Mass and volume yield density, so transits give unique insights into the interior structure of an exoplanet. Super-Earths are a class of exoplanet with masses a few times that of Earth, for which no examples exist in our Solar System. The goals of this thesis: to detect and characterise transits of exoplanets (particularly super-Earths) discovered via RV surveys orbiting bright stars. The observational tool: MO

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14

Dragomir, Diana. "Characterising the orbits of long period exoplanets." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21929.

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To date nearly 300 exoplanets have been discovered, most of them through measurements of the wobble induced by the planet in the motion of its host star. We have developed a program, based on Bayesian inference, to fit eccentric Keplerian orbits to exoplanet radial velocity data. The data consist of optical spectra obtained using the HIRES echelle spectrometer on the Keck I telescope. We have applied the program to 58 sets of measurements. We have obtained probability distributions for the orbital period and eccentricity for each set. We have found that clear upper and lower limits can be plac

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15

Simpson, E. K. "The discovery and characterisation of transiting exoplanets." Thesis, Queen's University Belfast, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546439.

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16

Zeng, Li. "Interior Structure and Chemistry of Solid Exoplanets." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17467291.

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Understanding the interior structures and chemistry of Earth-like exoplanets is crucial for us to characterize exoplanets, and to find potentially habitable planets. First, I provide a model grid of the mass-radius relations for solid planets in between 0.1 and 100 Earth masses. Planets are modeled as consisting of three layers: Fe, MgSiO3 and H2O. This model is made into an interactive tool available online: http://www.astrozeng.com/ Second, I explore the effects of thermal evolution and phase transitions on the interior structures of H2O-rich planets. It is shown that the bulk H2O in such

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17

Osborn, Hugh P. "Long-period exoplanets from photometric transit surveys." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/98252/.

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Photometric transit surveys on the ground & in space have detected thousands of transiting exoplanets, typically by analytically combining the signals from multiple transits. This technique of exoplanet detection was exploited in K2 to detect nearly 200 candidate planets, and extensive follow-up was able to confirm the planet K2-110b as a 2:6 0:1R , 16:7 3:2M planet on a 14d orbit around a K-dwarf. The ability to push beyond the time limit set by transit surveys to detect long-period transiting objects from a single eclipse was also studied. This was performed by developing a search technique

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18

Samuel, Benjamin. "Détection et caractérisation d’exoplanètes avec le télescope spatial CoRoT : contributions à la découverte et étude physique de la super-terre CoRoT-7b." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112049/document.

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La photométrie des transits permet de détecter des planètes extrasolaires en mesurant leur rayon. Dans cet objectif, le télescope spatial CoRoT (Convection, Rotation et Transit planétaires), lancé en décembre 2006, est doté d'un photomètre de haute précision permettant à la fois l'étude de la structure interne des étoiles par astérosismologie et la détection de planètes par la méthode des transits. Pour cette thèse, j'ai développé différents outils informatiques permettant la détection, l'analyse détaillée de transits dans les courbes de lumière de CoRoT. J'ai appliqué ces outils aux quelques

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19

Benneke, Björn. "Bayesian atmospheric retrieval for exoplanets : uniqueness of exoplanet spectra, characterizations of super-earths, and evaluations of dedicated space telescope designs." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82496.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2013.<br>This thesis was scanned as part of an electronic thesis pilot project.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 181-187).<br>After centuries of studying the eight planets in our solar system, recent improvements in technology have given us the unprecedented opportunity to detect planets 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

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Bernardes, Luander. "Exoplanetas, Extremófilos e Habitabilidade." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/14/14131/tde-21062013-162408/.

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O principal objetivo do trabalho foi estimar a possibilidade de sobrevivência de micro-organismos extremófilos na superfície de exoplanetas conhecidos, assim como na superfície de seus eventuais satélites naturais. Foi utilizado um modelo que simula a atmosfera terrestre primordial, composta principalmente por nitrogênio, água e dióxido de carbono. E em se tratando de extremófilos, esses cálculos não foram limitados à Zona Habitável dos sistemas planetários, pois esse conceito foi estendido para uma região mais ampla, a Zona Extremófila, onde a vida pode existir. Extremófilos são micro-organis

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Reidarman, Karin. "Exoplanets: Interactive Visualization of Data and Discovery Method." Thesis, Linköpings universitet, Medie- och Informationsteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-156717.

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This report provides a description of the development and implementation of an Exoplanet visualization within the interactive astro-visualization software OpenSpace. Orbital Data from The Exoplanet Orbit Database were used to render the planetary systems around stars known to have exoplanets in orbit. The uncertainties of the data in the database were incorporated into the design of the visualization. A feature that visualizes the discovery method of exoplanets was also implemented.

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Günther, Maximilian Norbert. "Identifying exoplanets and unmasking false positives with NGTS." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277873.

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In my PhD, I advanced the scientific exploration of the Next Generation Transit Survey (NGTS), a ground-based wide-field survey operating at ESO’s Paranal Observatory in Chile since 2016. My original contribution to knowledge is the development of novel methods to 1) estimate NGTS’ yield of planets and false positives; 2) disentangle planets from false positives; and 3) accurately characterise planets. If an exoplanet passes (transits) in front of its host star, we can measure a periodic decrease in brightness. The study of transiting exoplanets gives insight into their size, formation, bulk c

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Busuttil, Richard. "Investigating exoplanets and transients using small-aperture telescopes." Thesis, Open University, 2017. http://oro.open.ac.uk/49860/.

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This work characterises PIRATE’s primary camera, the SBIG STX-16803, as well as assessing the usefulness and impact of a small-aperture semi-autonomous facility in Mallorca for exoplanet studies and studies of transient sources. Additionally, a method for exploring the Roche lobe of an exoplanet and the effects this has on the shape and density of the planet is also described. PIRATE is a small aperture photometric facility that can be operated remotely or autonomously, is constructed from commercially available hardware and utilised by The Open University for research, education and outreach.

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Nascimbeni, Valerio. "New techniques to detect and characterize transiting exoplanets." Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422547.

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The study of extrasolar planets (in short, "exoplanets") is one of the most young and rapidly-evolving fields of astronomical research. The present thesis is primarily about the development of new observational and reduction/analysis techniques to 1) characterize known transiting extrasolar planets by means of high-precision, ground-based differential photometry 2) to exploit the same data to search for additional bodies in known planetary systems, by employing the so-called Transit Time Variation (TTV) analysis. For both aims, I developed independent and customized software pipelines targeted

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25

Chingaipe, Peter Marley. "Kernel-nulling pour la détection directe des exoplanètes." Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ5019.

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La découverte et la caractérisation de planètes autour d'autres étoiles (ou exoplanètes) sont l'un des sujets les plus passionnants de l'astronomie moderne. Les méthodes de détection indirecte, qui représentent jusqu'à présent la grande majorité des exoplanètes confirmées, ont révélé l'ubiquité et la diversité de ces mondes extrasolaires. Une alternative : la détection directe par imagerie de la lumière infrarouge émise ou réfléchie par les planètes elles-mêmes, offre le meilleur moyen d'aller au-delà d'une caractérisation de base et permet d'envisager la recherche de signes d'activité biologi

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Bachelet, Étienne. "Détection d'exoplanètes par effet de microlentille gravitationnelle : des observations à la caractérisation." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2138/.

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L'utilisation des microlentilles gravitationnelles dans la recherche d'exoplanètes a débuté en 1995. Les premiers résultats furent rapides, puisque la première exoplanète fut détectée en 2003 par les collaborations MOA et OGLE. Aujourd'hui, plus de vingt exoplanètes ont été publiées et ce nombre va considérablement augmenter dans les prochaines années avec le lancement des télescopes de surveillance KMTNet et les observatoires spatiaux EUCLID et WFIRST. Lorsqu'une étoile "proche", la microlentille, croise la ligne de visée entre la Terre et une étoile plus distante, la source, le flux de cette

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Alapini, Odunlade Aude Ekundayo Pauline. "Transiting exoplanets : characterisation in the presence of stellar activity." Thesis, University of Exeter, 2010. http://hdl.handle.net/10036/104834.

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The combined observations of a planet’s transits and the radial velocity variations of its host star allow the determination of the planet’s orbital parameters, and most inter- estingly of its radius and mass, and hence its mean density. Observed densities provide important constraints to planet structure and evolution models. The uncertainties on the parameters of large exoplanets mainly arise from those on stellar masses and radii. For small exoplanets, the treatment of stellar variability limits the accuracy on the de- rived parameters. The goal of this PhD thesis was to reduce these source

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Childers, Joseph M. "A search for transiting exoplanets in eclipsing binary stars." Virtual Press, 2008. http://liblink.bsu.edu/uhtbin/catkey/1398708.

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This study presents the development of an observing program to pursue the idea of looking for transiting exoplanets in eclipsing binary stars. The various kinds of orbits a planet might have in a binary system are explored. From this it is shown how to anticipate the possible orbits a planet might have in a given star system. The potential detectability of a planet in a binary system is also analyzed. Together these guidelines enable observers to rank targets by the likelihood that a detectable planet might exist in the system. The results of observations by a team at Ball State University of

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North, Thomas Samuel Harry. "Exoplanets and asteroseismology : know the star, know the planet." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8640/.

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This thesis primarily considers evolved exoplanetary systems through the use of asteroseismology as a tool to investigate the fundamental properties of the host stars, and the inferred planetary parameters. Of particular interest are the masses of evolved stars, and investigating how the available observables may bias the recovered mass estimates. Accurate and precise stellar masses are of critical importance. Whilst most of this work considers ensemble analysis, where relevant individual systems are considered, including a binary star system with an M dwarf and an asteroseismic red giant prim

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De, Kleer Katherine Rebecca. "Photometry and transit-timing analysis for eleven transiting exoplanets." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/51598.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2009.<br>Includes bibliographical references (leaves 101-102).<br>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 between one and 20 transits, and differential aperture photometry is performed for each transit observation. For the system TrES-2, this thesis examines 14 differen

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Morley, Caroline V. "Measuring transit timing variations of exoplanets using small telescopes." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/114139.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 57-58).<br>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 to within two sigma. Transit timing variations were not observed in these systems, but

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Garreau, Germain. "Detecting Earth-like exoplanets using high-dispersion nulling interferometry." Thesis, KTH, Tillämpad fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-293172.

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The detection of Earth-like exoplanets and the characterization of their atmospheres is a challenge one needs to solve to assess their habitability and the presence of life in the universe. If this challenge is still unresolved today, even in the era of giant telescopes, it is mainly because of the very high contrast between these exoplanets and their host star and also their proximity. To overcome both of these constraints, a new method combining high-dispersion spectroscopy and nulling interferometry has been imagined. The idea is to use the nulling interferometry to attenuate the star light

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Clarke, N. "A novel instrument for the advanced investigation of exoplanets." Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1469579/.

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This thesis sets out to analyse and define an instrument capable of advancing the field of exoplanet research. This exciting and nascent field of astrophysics is moving beyond simple population counts and into more detailed characterisation of exoplanet parameters. To this end high resolution and high contrast missions are required to achieve this. In this thesis three designs were investigated, two pupil masked telescopes and an interferometric system. The First masked design was an axially symmetric system using a petal mask. This design was intended to reduce the diffraction wings resulting

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Cunial, Andrea. "Photometric searches for exoplanets and variability in star clusters." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3427233.

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This thesis is focused on the photometric analysis of stellar light curves (LCs), to search for variable stars and transiting extrasolar planets. In particular, this study is carried out on crowded fields which include open clusters (OCs). The context of my work is the photometric preparatory survey “The Asiago Pathfinder for HARPS-N” (APHN; PI: Bedin) aimed at characterising OCs (i.e. M44, NGC752, M35, NGC2158 and M67) to be observed with the High Accuracy Radial velocity Planet Searcher for the Northern hemisphere (HARPS-N), mounted at the Telescopio Nazionale Galileo (TNG). The APHN surve

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Umbriaco, Gabriele. "Exoplanets through extreme optics: from PLATO to SHARK-NIR." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3422828.

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In the last years, the Observatory of Padova (Istituto Nazionale di Astrofisica – Osservatorio Astronomico di Padova) and the University of Padova have been involved massively in projects dedicated to the exoplanets search, both ground, and space-based. SHARK-NIR, the acronym of “System for coronagraphy with High order Adaptive optics from R to K band – Near-Infrared”, is an instrument designed to search and characterize the young exo-planetary system and star-forming regions in the NIR domain, in coronagraphic direct imaging and spectroscopic mode. It has been selected for the 2nd generation

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Bounama, Christine. "Thermische Evolution und Habitabilität erdähnlicher Exoplaneten." Phd thesis, Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1648/.

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In der vorliegenden Arbeit werden Methoden der Erdsystemanalyse auf die Untersuchung der Habitabilität terrestrischer Exoplaneten angewandt. Mit Hilfe eines parametrisierten Konvektionsmodells für die Erde wird die thermische Evolution von terrestrischen Planeten berechnet. Bei zunehmender Leuchtkraft des Zentralsterns wird über den globalen Karbonat-Silikat-Kreislauf das planetare Klima stabilisiert. Für eine photosynthetisch-aktive Biosphäre, die in einem bestimmten Temperaturbereich bei hinreichender CO2-Konzentration existieren kann, wird eine Überlebenspanne abgeschätzt. Der Abstandsbe

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See, Wyke Chun Victor. "Stellar magnetism and activity : from stellar interiors to orbiting exoplanets." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/9602.

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The study of magnetic fields on low-mass stars is important due to their ubiquity. They are responsible for phenomena spanning a wide range of spatial and temporal scales. Over the last two decades, the Zeeman-Doppler imaging (ZDI) technique has been used to study the topologies of stellar magnetic fields. A great deal has been learnt about how the magnetic characteristics of cool dwarfs vary as a function of parameters such as mass, rotation or age. In this thesis, I assemble a sample of stars with Zeeman-Doppler maps. I study their poloidal and toroidal components as a function of fundamenta

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Mocnik, Teo. "Characterization of transiting exoplanets and their host stars by K2." Thesis, Keele University, 2018. http://eprints.keele.ac.uk/5598/.

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The WASP project has discovered many transiting gas giant exoplanets. Some of these exoplanet systems have been observed by the K2 space-based telescope. The much higher photometric precision, shorter cadence and extended continuous follow-up observations provided by the K2 mission enabled the most detailed photometric characterization yet of the WASP and other planetary systems presented in this thesis, which contributes to our understanding of how planets form and evolve. I analysed the majority of transiting exoplanet systems observed by the K2 in the 1-min short-cadence mode within the fir

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Messenger, Stephen Joseph. "Detectability of biosignature gases in the atmospheres of terrestrial exoplanets." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/79156.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2013.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (p. 179-182).<br>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 w

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Waldmann, I. P. "Of 'cocktail parties' and exoplanets : data analysis in exoplanetary spectroscopy." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1349611/.

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The field of transiting extrasolar planets and especially the study of their atmospheres is one of the youngest and most dynamic subjects in current astrophysics. To study the atmospheres of those foreign worlds, we typically require a 10^−4 to 10^−5 level of accuracy in flux. Currently available instruments were not designed with these precisions in mind. Calibrating an instrument without knowing its response function at the required level has become the central challenge of exoplanetary spectroscopy. A variety of parametric correction models are used in the literature. These show high degene

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Beichman, Charles, John Livingston, Michael Werner, et al. "SPITZER OBSERVATIONS OF EXOPLANETS DISCOVERED WITH THE KEPLER K2 MISSION." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621243.

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We have used the Spitzer Space Telescope to observe two transiting planetary systems orbiting low-mass stars discovered in the Kepler K2 mission. The system K2-3 (EPIC 201367065) hosts three planets, while K2-26 (EPIC 202083828) hosts a single planet. Observations of all four objects in these two systems confirm and refine the orbital and physical parameters of the planets. The refined orbital information and more precise planet radii possible with Spitzer will be critical for future observations of these and other K2 targets. For K2-3b we find marginally significant evidence for a transit tim

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Mulders, Gijs D., Ilaria Pascucci, Dániel Apai, Antonio Frasca, and Joanna Molenda-Żakowicz. "A SUPER-SOLAR METALLICITY FOR STARS WITH HOT ROCKY EXOPLANETS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622435.

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Host star metallicity provides a measure of the conditions in protoplanetary disks at the time of planet formation. Using a sample of over 20,000 Kepler stars with spectroscopic metallicities from the LAMOST survey, we explore how the exoplanet population depends on host star metallicity as a function of orbital period and planet size. We find that exoplanets with orbital periods less than 10 days are preferentially found around metal-rich stars ([Fe/H] similar or equal to 0.15 +/- 0.05 dex). The occurrence rates of these hot exoplanets increases to similar to 30% for super-solar metallicity s

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Rajpaul, Vinesh Maguire. "Gaussian process tools for modelling stellar signals and studying exoplanets." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:4587b280-f93c-4847-915a-ab33f6a55a01.

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The discovery of exoplanets represents one of the greatest scientific revolutions in history, and exoplanetary science has rapidly become uniquely positioned to address profound questions about the origins of life, and about humanity's place (and future) in the cosmos. Since the discovery of the first exoplanet over two decades ago, the radial velocity (RV) method has been one of the most productive techniques for discovering new planets. It has also become indispensable for characterising exoplanets detected via other techniques, notably transit photometry. Unfortunately, signals intrinsic to

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Caldas, Anthony. "Étude des biais observationnels induits par le caractère tridimensionnel des atmosphères d’exoplanètes." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0439/document.

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Nous cherchons à mettre en évidence l'influence des hétérogénéités de température, de structure ou de composition des atmosphères sur leurs observations. Dans le années à venir, de plus en plus d'appareils vont permettre l'observation par transmission des atmosphères d'exoplanètes. Toutefois, les outils numériques permettant de contraindre ces dernières reposent sur des modèles simples à une dimension. Ils supposent en effet des atmosphères ne possédant qu'une structure verticale (le climat est le même en tout point de la surface, la composition ou la température n'évolue qu'avec l'altitude).

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Ballard, Sarah. "In Pursuit of New Worlds: Searches for and Studies of Transiting Exoplanets from Three Space-Based Observatories." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10229.

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This thesis presents studies of transiting exoplanets using observations gathered in large part from space, with the NASA EPOXI Mission, the Spitzer Space Telescope, and the Kepler Mission. The first part of this thesis describes searches for additional transiting planets in known exoplanet systems, using time series photometry gathered as part of the NASA EPOXI Mission. Using the EPOXI light curves spanning weeks for each star, we searched six exoplanetary systems for signatures of additional transiting planets. These six systems include five hosts to hot Jupiters: HAT-P-4, TrES-3, TrES-2, WA

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Минак, В. І., та О. О. Орлова. "Дослідження процесів та методів в області пошуку та вивчення екзопланет". Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/14082.

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Дана робота присвячена дослідженню процесу в області пошуку та вивчення екзопланет - планетарних утворень поза межами нашої сонячної системи. В роботі також детально розглянуто фізичні основи методик пошуку екзопланет. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/14082

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Hicks, Brian Andrew. "Nulling interferometers for space-based high-contrast visible imaging and measurement of exoplanetary environments." Thesis, Boston University, 2012. https://hdl.handle.net/2144/32883.

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Thesis (Ph.D.)--Boston University<br>PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.<br>This dissertation presents the legacy, theory, design, characterization, and application prospects of a fully symmetric monolithic nulling interferometer (nuller). A nuller's function is to destructively inte

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Stevenson, Kevin. "Detecting and Characterizing Exoplanets: The GJ 436 and HD 149026 Systems." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5518.

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This dissertation investigates two stellar systems known to contain extrasolar planets. It is comprised of five chapters that are readily divided into three independent but related analyses. Chapter 1 reports on the analysis of low signal-to-noise secondary-eclipse observations of the Neptune-sized exoplanet GJ 436b using the Spitzer Space Telescope in multiple infrared channels. The measured wavelength-dependent eclipse depths provide constraints on the planet's dayside atmospheric composition and thermal profile. The analysis indicates that GJ 436b's atmosphere is abundant in carbon

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Bartilsson, Alexander. "On the possibility of nding exoplanets usinggravitational lensing of radio backgrounds." Thesis, Stockholms universitet, Institutionen för astronomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-166296.

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We propose a new method for detecting exoplanets using gravita-tional lensing. The hypothesis is that the lensing caused by an exo-planet could distort the structures of a radio background, for instancea H II region. It cannot be done with todays telescope but with thesecond incarnation of the Square Kilometer Array (SKA), currently inits design phase we deem it possible. In order to test this hypothesis weconstructed a simulation that creates a simple background structurewith variable scale and then produces simulated images such as theones achievable with the SKA. We produce positive result

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Hu, Renyu Ph D. Massachusetts Institute of Technology. "Atmospheric photochemistry, surface features, and potential biosignature gases of terrestrial exoplanets." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82168.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2013.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (p. 269-304).<br>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 f

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