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.

Supervisor: S.F. Portegies Zwart Co-Supervisor: A.G.A. Brown

PhD Defence

He discovered how to determine the rotation and centre of our Milky Way, predicted where comets come from and laid the groundwork for radio astronomy: Leiden Professor of Astronomy Jan Hendrik Oort (1900 – 1992). Piet van der Kruit, whose PhD supervisor was Oort himself, has written a biography about…

The success of Dutch radio astronomy in the last century was largely due to Leiden astronomer Jan Hendrik Oort. He made astute use of circumstances in the post-war period. Historian Astrid Elbers' research focuses on this golden period.

Promotores: S.J. Edixhoven, F. Andreatta

From the Big Bang to superconductivity. Many ground-breaking discoveries have been made in Leiden University’s long history.

The quantum computer is on its way, but is society ready for it? Quantum computers have a reputation of being difficult to grasp because of their complexity. This limits society’s ability to envision future applications creating a gap between society and quantum computers. A consortium of 14 knowledge…

The Old Observatory has a rich history. On this page you will find a short version of the history that took place in the observatory.

This thesis is largely an experimental study on the formation of solid-state simple and complex organic molecules in the H2O-rich and CO-rich ice phases of dense interstellar clouds and dark cores.

Whether finding signals of dark matter or discovering hydrogen in the vicinity of exoplanets, Leiden astronomers are world players in their field, and they are part of a long tradition: Leiden was the first university in the world to have its own observatory.

This thesis concerns the relation bettween the good reduction of Shimura varieties and the associated loop groups.

Master

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.

From children’s inability to identify animals to a big protest at the opening of the academic year: below are some of our most popular articles of 2019.

Promotores: F.H. van Lunteren, F.P. Israel

The winner of the highest scientific distinction in mathematics, an explanation for wine tears and much more mathematical theory and application. From 8 to 12 July, 550 mathematicians will meet in the center of Leiden to discuss differential equations.

The yearly Oortlezing, in the memory of the famous Dutch astronomer, is organized by the Stichting Het Jan Hendrik Oort Fonds and Leiden Observatory. This public lecture is always about a current astronomical topic and is meant for a broad audience that is interested in astronomy. The public lecture…

The first Leiden Science Family Day on Saturday 6 October was a great success. During the ‘Weekend of Science’ more than 700 visitors, including 350 children, visited the Faculty of Science. With a program full of experiments, lectures, guided tours and demonstrations, visitors were given a glimpse…

The project has been done in the Quantum Matter & Optics group under the supervision of Prof.dr.ir. Tjerk Oosterkamp.The title of the presentation is: "New methods to improve the usability in Magnetic Resonance Frequency Microscopy."The presentation will take place on Monday 29 January @ 13:30 hrs…

The project has been done in the Quantum Matter Optics group under the supervision of Dr.ir. Sense Jan van der Molen. The title of the presentation is: ''A Technique for Studying Surface Profiles of Two-Dimensional Materials in LEEM." The presentation will take place on Wednesdag 6 December @ 09:15…

The project has been done in the Cosine group under the supervision of Prof. Dr. Martin van Exter and MSc Marta Brusasca.The title of the presentation is: ''Calibration of the condifood DemoDevice.

The project has been done under the supervision of Dr. Diego Garlaschelli and Dr. Frank Takes. The title of the presentation is: ''Complex Network Analysis of Darknet Black Market Forum Structure." The presentation will take place on Thursday 5 October @ 10:00 hrs in room 276 of the Oort building. You…

The project has been done in the Quantum Matter and Optics group under the supervision of Prof.dr.ir. T.H. Oosterkamp and Dr.ir. S.J. van der Molen . The title of the presentation is: ''Friction of ice skating." The presentation will take place on Friday 22 September @ 12:00 hrs in room 173 of the Oort…

Het project heeft plaats gevonden onder begeleiding van Prof.dr.ir.Tjerk Oosterkamp. De titel van de presentatie is:"Determining the concentration of Chlorophyll-a in ditch water through UV/VIS Absorption Spectroscopy." De datum van de presentatie is dinsdag 30 januari om 15:00 in het Oort gebouw, zaal…

Alumni Event

Professor Barend Mons has been appointed Chair of the Commission High Level Expert Group "European Open Science Cloud", initiated by the European Commission, DG Research and Innovation.

If there is life outside our galaxy, how could we find it? In his Oort Lecture, James Kasting talks about his search for simple life on other planets. Kasting was in the Netherlands for two weeks, because he was invited as the Oort Professor 2018.

PhD Defence

PhD Defence

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Lecture

PhD Defence

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We strive to address the challenge of constructing a modeling language to write software which can take advantage of recent hardware developments (multicore, cloud) without compromising in its abstraction levels.

General

We simulate interstellar clouds with special plasma expansions and chemical reactions on icy dust grains to be measured in ultra-high vacuum setups. This provides the data necessary to guide and interpret astronomical observations and to model reaction networks in space. [Harold Linnartz]

The colloquia Ehrenfestii take place about once every month. This lecture series has been running since 1912.

Promotor: J. Schaye

Promotores: Prof.dr. S.J. Edixhoven, Prof.dr. E. Ullmo (University Paris-Sud)

Multiple stars, that is two or more stars composing a gravitationally bound system, are common in the universe.

At Leiden Observatory, researchers investigate the origin of stars and their planetary systems. They detect and characterize planets around other stars, which are called exo-planets. They study how stars and planets form. And they follow molecules from interstellar clouds to nascent planet systems.…

Researchers at LIACS are working to devise the computers of tomorrow that will be the backbone of the Cloud and Edge computing paradigms as well as the Internet of Things. In this respect, we are involved in research and development of high performance computing systems, embedded & real-time computing…

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.