This thesis focuses on protoplanetary disks: flattened structures of gas and dust around young stars in which planets are expected to form and grow.

An international team of astronomers, including Leiden’s Christian Ginski, has discovered previously unobserved structures in a debris disk around a nearby star. Article published in Nature on 8 October.

Promotores: Prof.dr. A.G.G.M. Tielens, Prof.dr. L.B.F.M. Waters (UvA), Prof.dr. C. Dominik (UvA)

Promotor: Prof. dr. I. Snellen, Co-Promotor: Dr. M. Kenworthy

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

In this thesis, we present new laboratory data of interstellar dust analogues.

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.

To study how planetary systems come into existence we study much younger systems still in formation.

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.

A large diversity of exoplanetary systems has been found, but it is still unclear what drives this diversity.

Planets are formed in disks of gas and dust around young stars.

This thesis examines the link between simple molecules and the underlying structure and chemistry within protoplanetary disks - the birthplaces of planets.

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

Russia recently blew up a defect satellite. As a result, the amount of space debris in Earth orbit has increased.

Promotores: Prof.dr. E.F. van Dishoeck, Prof.dr. C.P. Dullemond

An international team of astronomers led by scientists from Leiden Observatory has for the first time characterised a dust disk surrounding a young super-Jupiter, which is either a giant planet or brown dwarf. They detected infrared emission from the disk which might indicate that moons may have formed.…

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

A Dutch-led team of astronomers has discovered that high-mass stars are formed differently from their smaller siblings. Whereas small stars are often surrounded by an orderly disk of dust and matter, the supply of matter to large stars is a chaotic mess. The researchers used the Atacama Large Millimeter/submillimeter…

This thesis addresses the chemical processes that determine the compositions of giant planet atmospheres.

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).

What is the origin of solar systems?

Promotor: E. F. van Dishoeck, Co-promotor: C. Walsh

An international team of astronomers including Leiden scientists publishes the image of a young star with a surrounding dust disk that is still being fed from its surroundings. The phenomenon around the star SU Aur may explain why so many exoplanets are not neatly aligned with their star. The European…

In the discs of dust and gasses around young stars, mysterious structures occur. Together with professor Ewine van Dishoeck, PhD student Paolo Cazzoletti investigate how we can explain these forms, such as rings, spirals and holes. On 12 December, he will defend his thesis.

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

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

Space travel has long since progressed from being just about rockets, travelling to the moon, and Russia and America. The Netherlands has its own Space Agency and one of its important tasks is collecting and making available increasingly advanced satellite data.

An international team of researchers led by Alice Booth (Leiden University, the Netherlands) have discovered methanol in the warm part of a planet-forming disk. The methanol cannot have been produced there and must have originated in the cold gas clouds from which the star and the disk formed. Thus,…

Walsh

The demolition of the high-rise building is ready. The remaining debris are removed and the area is cleared. For the demolition, the University applied the BREEAM evaluation method at the level of ‘Excellent’, which means that the demolition operations were carbon neutral and did not cause any form…

Sustainable energy from wind and solar is most readily available near the sea.

PhD Defence

Case concerning the Compensation due from the exploded M2M Satellite’s Space Debris

Beowulf clusters looking for new frontiers.

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

Tin electrodeposition applications have rapidly evolved in the past 25 years.

Dishoeck

PhD Defence

PhD Defence

This dissertation consists of two parts, with the common theme

These are the proposed research projects for LEAPS 2019. Please note that not all projects will go ahead and some may still be added in the near future. Final funding decisions lie with the Faculty sponsors. And please make a note that if you are interested in an ESA project, to check if your state…

Several buildings need to be demolished to make way for phase 2.

PhD Defence

Membrane proteins and membrane interactions of proteins are studied by spin label EPR. Intact, native membranes, vesicles of all sizes and nano-disks can be investigated, because the size of the object does not matter in EPR. Whereas solution NMR is limited to micelles (a few nm in diameter), by EPR…

PhD Defence

PhD Defence

PhD Defence

PhD Defence

Astronomer Jos de Boer has received the Chesneau Prize in Nice for his research into so-called protoplanetary disks. The prize is awarded to the best astronomical dissertation in the field of high angular resolution. 'I consider it a good opportunity to talk about my research.'