Promotor: Prof.dr. E.F. van Dishoeck, Co-promotor: S. Bruderer

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

Low-mass main-sequence stars like our Sun are continuous sources of outflowing hot magnetised plasma. In the case of the Sun, this is known as the solar wind, whereas for other stars they are called stellar winds.

Promotor: Prof.dr. E.F. van Dishoeck, Co-Promotor: M.R. Hogerheijde

One of the key quests in astronomy is to study the growth and evolution of galaxies across cosmic time. Radio observations provide a powerful means of studying the formation of stars and subsequent buildup of distant galaxies, in a way that is unbiased by the presence of dust.

In this thesis chemical and physical processes in the ice mantles on interstellar dust grains are studied.

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.…

At Leiden Observatory, researchers investigate the origin of stars and their planetary systems. They detect and characterize planets around other stars (exoplanets). They study how stars and planets form. And they follow molecules from interstellar clouds to nascent planet systems. This way they address…

What is the origin of solar systems?

How did galaxies form? How did galaxies evolve?

This thesis focus on the interaction between M dwarf stellar winds and Galactic cosmic rays and the possible effects on the habitability of exoplanets.

The origin and evolution of galaxies are closely tied to the cyclic feedback processes between stars and the interstellar medium (ISM).

Promotor: Prof.dr. E.F. van Dishoeck, Prof.dr. F.F.S. van der Tak (RUG)

Promotores: Prof.dr. M. Franx & Prof.dr. P.G. van Dokkum (Yale University)

When observing star-forming galaxies, we are not only seeing stellar light, but we also see how this interacts with galactic gas and dust. This thesis contains studies of the stellar, nebular and dust properties of low mass star-forming galaxies.

OB associations are loose groups of young, massive stars. They constitute the last stage of the massive starformation process, and the context in which new stars are formed.

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.

To address the fundamental questions of how life on Earth emerged and how common life may be in the Universe, it is crucial to know the chemical composition of the planet-forming material.

Promotor: F.P. Israel, Co-Promoter: R. Meijerink

The focus of this thesis is how stars like our Sun and planets like Jupiter, Saturn, and Earth are formed.

This thesis investigates how galaxies form and what diversifies the evolutionary histories of galaxies.

Promotor: Prof.dr. E. F. van Dishoeck, Co-promotor: A. N. Heays

Within this project, PeptoMiktoStars were realized through an orthogonal protecting group strategy and should be investigated further regarding their potential as drug delivery systems in the field of drug delivery to inflamed areas in cancer, bacterial infections or autoimmune diseases.

Promotor: P. T. de Zeeuw, Co-promotor: N. Neumayer; G. van de Ven

Promotor: Prof.dr. M. Franx, Co-Promotor: Rychard Bouwens

This thesis develops a method for direction dependent calibration of the ionosphere in radio interferometric data.

Perform cutting-edge research in the area of the STAR mathematics cluster.

Rossi

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.

In the large gas clouds between the stars, chemical reactions take place under extreme conditions, giving rise to both small molecules, such as water and common salt, as well as large complex molecules that can serve as the building blocks of life. This is known as astrochemistry and it is something…

The high velocity tail of the total velocity distribution of stars provides essential insight into fundamental properties of the Galaxy.

Promotor: J. Schaye

The bi-annual interactive seminars of the Platform for Postcolonial Readings are all about sharing our enthusiasm about our field of research and our eagerness to learn more about its theoretical intricacies. Our seminars, although informal, adopt a well-defined format. Each meeting is organized around…

It is well known that photography means writing with light. However, the meaning of “with” can be ambiguous. Film can be exposed outside of the camera. Historically, people have done so to render visible other forms of radiation than what we call light. In mid-2013, Andrew Littlejohn took several rolls…

In a century replete with radical politics, final liberations, historical codas, and dreams of eternity, the shadowy figure of Louis-Auguste Blanqui, the constant revolutionary, wrote Eternity by the Stars in the last months of 1871 while incarcerated in Fort du Taureau, a marine cell of the English…

The Sun and all the stars in the night sky reside in the Milky Way galaxy. In the at-rest reference frame of the Galaxy, typical stars travel with velocities of about 100-200 kilometres per second.

A team of European astronomers under Leiden leadership has discovered that dust particles around a star already coagulate before the star is fully grown. These agglomerated dust particles are the first step in the formation of planets. The research publish their discovery in the journal of Nature As…

Promotores: Prof.dr. A.G.G.M. Tielens & Prof.dr. L. Kaper (UvA)

Why do some children confront social challenges with confidence, whereas others experience difficulties? What is the role of child temperament and child emotional dispositions? What is the role of parenting? This project aims to shed light on the mechanisms explaining shyness and confidence in response…

Show People offers a comprehensive history of the film star from Mary Pickford to Andy Serkis, traversing more than one hundred years and drawing on examples from America, Britain, Europe, Asia and elsewhere.

Promotor: Prof.dr. E.F. van Dishoeck, Co-Promotor: G.J. Herczeg

This thesis discusses the physical and chemical processes than influence the composition of forming planets.

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.

Circumstellar discs are the reservoirs of gas and dust that surround young stars and have the potential to become planetary systems.

Some species of proteins which can form liquid-like condensates, also exhibit growth into fibers (or fibrils). One particularly interesting set of such proteins are those that are associated with neurodegeneration in which the fiber growth may be related to the pathological fibrils observed in disea…

Promotores: Prof.dr. J. Schaye, Prof.dr. S.D.M. White (MPA Garching)

Leiden University has participated in an international study carried out by the CARMENES consortium, which has discovered two small, terrestrial planets around Teegarden’s Star. The planets have masses similar to Earth and their temperatures could be mild enough to sustain liquid water on their surf…

My work focuses on a class of astronomical objects called protoplanetary disks.