497 zoekresultaten voor “stars” in de Publieke website
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The Great Collapse
Promotor: Prof.dr. S.F. Portegies Zwart
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Cold gas in distant galaxies
The formation and evolution of galaxies is fundamentally driven by the formation of new stars out of cold gas.
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Galaxy formation traced by heavy element pollution
Galaxies form and evolve through close interaction with their surroundings. As a result, the heavy elements ('metals') that are synthesized in stars, are found both inside and outside galaxies.
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Modeling interstellar bubbles: near and far
Promotor: Prof. dr. A.G.G.M. Tielens
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The astrochemical factory: A solid base for interstellar reactions
In this thesis chemical and physical processes in the ice mantles on interstellar dust grains are studied.
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Ice and Gas in Protostellar Clouds and Planet-forming Disks
This thesis takes steps toward understanding the interaction between gas-phase and solid-state molecules in star- and planet-forming regions.
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Identifying the origins of galaxy formation
This thesis investigates how galaxies form and what diversifies the evolutionary histories of galaxies.
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Exploring the interactions of M dwarf winds and cosmic rays
This thesis focus on the interaction between M dwarf stellar winds and Galactic cosmic rays and the possible effects on the habitability of exoplanets.
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Freezing conditions in warm disks: snowlines and their effect on the chemical structure of planet-forming disks
This thesis focusses on the temperature structure in protoplanetary disks. The relation between structures seen in the dust and gas-phase molecules is investigated.
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Resolving the building blocks of galaxies in space and time
We investigate the buildup of galaxies from various vantage points. The first two chapters focus on the stellar content of galaxies, especially the distribution of stellar masses at birth and potential variations therein in various galactic environments.
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Monsters in the Deep: Using simulations to understand the excess baryonic mass in the centres of high-mass, early-type galaxies
This thesis aims to enhance our understanding of galaxies by testing theoretical models of galaxy formation against observations, particularly in the cases of extreme systems which have been found to have an excess of baryonic mass in their central regions, in the form of either supermassive black holes…
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The spin evolution of accreting and radio pulsars in binary systems
Pulsars were first discovered in 1967 and since then the population has grown and expanded over several wavelengths.
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Seeing Stars Leiden meet-up
Wetenschap en kunst
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The Demographics of Protoplanetary Disks: from Lupus to Orion
The work presented in this thesis is based on ALMA surveys of protoplanetary disks in three star-forming regions: Lupus, OMC-2, and NGC 2024.
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Hierarchical Systems
The thesis addresses the long-term dynamical evolution of hierarchical multiple systems.
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Early death of massive galaxies in the distant universe
Promotor: M. Franx, Co-Promotor: I.F. Labbé
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High-Contrast Imaging of Protoplanetary Disks
To study how planetary systems come into existence we study much younger systems still in formation.
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Neutral outflows in high-redshift dusty galaxies
Outflows are crucially important for the gas budget and evolution of luminous star-forming galaxies and AGNs, with observed mass outflow rates of the same order as the star formation rate. Greater star formation and black hole growth lead to more intense feedback and outflows, resulting in self-regulated…
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Don't Blink: Detecting transiting exoplanets with MASCARA
This thesis describes the Multi-site All-Sky CAmeRA (MASCARA), which consists of two small robotic telescope designed to detect exoplanets around the brightest stars in the sky.
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Orion's Dragon and Other Stories
Stellar feedback is a crucial ingredient in the evolution of galaxies.
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Resolving gas-phase metallicity in galaxies
Galaxies are environments where gas coalesces, cools, and is converted into stars. However, it remains unclear the exact mechanisms through which galaxies acquire, redistribute and lose their gas.
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UV Photodesorption and Photoconversion of Interstellar Ices
This thesis is an experimental study of the UV irradiation of the interstellar ice analogues, relevant for the different stages of the star and planet formation sequence.
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Structuur sterrenhopen ontrafeld
Sterrenkundige Simon Portegies Zwart ontwikkelde een model dat verklaart hoe sterrenhopen hun structuur krijgen en wat de grootte van een stofschijf bepaalt. Dat beschrijft hij in Monthly Notices of the Royal Astronomical Society.
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Causing a stir: Radiative and mechanical feedback in starburst galaxies
Promotores: Prof.dr. F.P. Israel, Prof.dr. P.P. van der Werf
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A molecular journey : tales of sublimating ices from hot cores to comets
The thesis explores how interstellar chemistry evolves as a function of time and changing physical architectures during the formation of stars.
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Dynamics and radiation from tidal disruption events
When a star gets too close to a supermassive black hole, it is torn apart by strong tidal forces in a tidal disruption event (TDE).
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Suppressing a Sea of Starlight: Enabling technology for the direct imaging of exoplanets
Promotor: Christoph U. Keller, Co-promotores: Matthew A. Kenworthy, Frans Snik
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Casting light on the ƞ Carinae puzzle
Promotor: Prof.dr. V. Icke, Co-Promotor: T.I. Madura
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Dynamics of the Oort Cloud and Formation of Interstellar Comets Santiago Torres Rodriguez
The solar system was formed approximately 4.56 billion years ago. Despite the numerous theories that have been developed over the years, the formation and evolution of the solar system still remain unclear.
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Ingredients of the planet-formation puzzle
High-angular-resolution observations of the circumstellar material have uncovered numerous and very diverse substructures in protoplanetary discs, raising the question of whether they are caused by forming planets or other mechanisms.
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Voorgaande projecten
Sinds de start van het Leiden University Green Office zijn er verschillende projecten gestart om de bewustwording onder medewerkers en studenten te vergroten en de universiteit te verduurzamen. Lees hier over onze afgeronde projecten.
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When galaxy clusters collide: the impact of merger shocks on cluster gas and galaxy evolution
Promotor: Prof.dr. H.J.A. Rottgering
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Linking simple molecules to grain evolution across planet-forming disks
Planets are formed in disks of gas and dust around young stars.
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Tracing the journey of the sun and the solar siblings through the Milky Way
Supervisor: S.F. Portegies Zwart Co-Supervisor: A.G.A. Brown
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Predicting the future: Predictive control for astronomical adaptive optics
The field of exoplanet research is rapidly advancing through the development of new technology, observing techniques, and post-processing methods.
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Non-equilibrium chemistry and cooling in simulations of galaxy formation
Promotor: J. Schaye
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Galactic substructures as tracers of dark matter and stellar evolution
One of the most important puzzles in modern astrophysics is the nature of dark matter.
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The colours of the extreme universe
This thesis presents pioneering work on the panchromatic emission of some of the most luminous galaxies in the early Universe: star forming galaxies and active galactic nuclei.
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Shining Light on Interstellar Matter
Promotor: H.V.J. Linnartz
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Tuning in to the feedback bassline: revealing the operation of AGNs in galaxy clusters with high-resolution radio observations
Following the Big Bang, structure in the Universe started collapsing under the force of gravity. This resulted in the formation of the first stars, galaxies and clusters of galaxies.
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Activiteitgericht huisvesten
De Universiteit Leiden is gestart met activiteitgericht huisvesten: het idee van voor elke activiteit een passende ruimte maken. Zo wordt medewerkers een werkplek gegeven voor hun verschillende werkzaamheden gedurende de dag.
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Painting with starlight : optical techniques for the high-contrast imaging of exoplanets
This thesis describes the development and validation of new high-contrast imaging techniques, with the ultimate goal of enabling the next generation of instruments for ELT-class telescopes to directly image Earth-like extra-solar planets orbiting around nearby stars.
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Young suns and infant planets: Probing the origins of solar systems
Even though more than 4000 extra-solar planets are known today, only a small fraction of these has been captured in an image. To better understand the planet formation mechanisms in solar-like environments we started the Young Suns Exoplanet Survey (YSES).
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Dutch Caribbean Homicide Monitor: levensdelicten in het Caribisch deel van het Koninkrijk
Het doel van dit project is het monitoren van levensdelicten in de Dutch Caribbean.
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The formation of complex organic molecules in dense clouds-Sweet results from laboratory
Large areas of space are filled by molecular clouds that consist of gas and dust grains that are the remnants of dead stars. When these clouds start collapsing, the decreasing temperature and increasing density cause gas particles to start accreting onto dust grain surfaces.
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Interstellar Catalysts and the PAH universe
Organic molecules in interstellar space are important as they influence the structure of galaxies and star formations. Studying catalytic processes in space allows us to understand how molecular species are formed and chemically evolved in the interstellar medium and solar system objects.
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Metals in the diffuse gas around high-redshift galaxies
Promotores: Prof.dr. J. Schaye & Prof.dr. C. Steidel (California Institute of Technology)
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Projecten
Sinds de start van de Green Office zijn er verschillende projecten gestart om de bewustwording onder medewerkers & studenten te vergroten en de universiteit te verduurzamen. Lees hier alles over onze eerdere en huidige projecten.
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Ewine van Dishoeck
Wiskunde en Natuurwetenschappen
ewine@strw.leidenuniv.nl | +31 71 527 5814
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Health Governance
Groeiende gezondheidsongelijkheid, stijgende zorgkosten, de vergrijzing en het tekort aan zorgpersoneel zijn maar een paar voorbeelden van uitdagingen waar de gezondheidszorg voor staat, in Nederland en daarbuiten. Deze vraagstukken vragen om antwoorden die voortkomen uit een interdisciplinaire aanpak,…