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.

List of ProParte sub-associations.

The buildings will be developed one by one. The work will vary from the major redevelopment, refurbishment or renovation of existing buildings.

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

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

The ALMA Local Expertise Group (Allegro) is located in the Leiden Observatory (Sterrewacht). Professor Ewine van Dishoeck: ‘The Netherlands has played an important role in establishing ALMA. Thanks to this subsidy, we can now reap the scientific benefits.'

This research focuses on the distribution of chemical elements in protoplanetary disks, the birthplaces of planets. These disks form around young stars and contain gas and dust, from which planets grow. Ice plays a crucial role in planet formation, aiding the clumping of dust particles and influencing…

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

Promotors: W. Jiskoot; G.J. Witkamp, Co-promotor: M.R. Nejadnik

The formation and evolution of galaxies is fundamentally driven by the formation of new stars out of cold gas.

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…

This thesis takes steps toward understanding the interaction between gas-phase and solid-state molecules in star- and planet-forming regions.

In the past decade many population studies have been performed with the Atacama Large Millimeter/submillimeter Array (ALMA) to understand the bulk properties of protoplanetary disks around young stars. These population studies mostly consisted of low mass stars, with relatively few of the disks around…

A study into the investment and impact of construction projects on Mycenaean communities in Late Bronze Age Greece

Promotor: J.N. Kok, Co-promotor: M.S. Lew

During the ceremony of the Opening of the Academic Year, University Lecturer Arjan Louwen has won Leiden University's prestigious LUS Teaching Award. The prize, awarded annually by the Leiden University Student Platform (LUS), honours lecturers who excel in their teaching. For Louwen, the nomination…

Large-scale computing infrastructure, such as supercomputers, cluster, and clouds, are already pervasive, most members of our society interact with them daily: social networks, government services, media streaming services--all systems heavily interfacing with the members of our society--are powered…

Particles are omnipresent in biopharmaceutical products. In protein-based therapeutics such particles are generally associated with impurities, either derived from the drug product itself (e.g. protein aggregates), or from extrinsic contaminations (e.g. cellulose fibers).

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.

PURPOSE: Determine the effect of minute quantities of sub-visible aggregates on the in vitro immunogenicity of clinically relevant protein therapeutics.

An in-depth history of Large Language Models—and what their ubiquity, disruption, and creativity mean from a wider sociopolitical perspective.

On September 16th, 2024, Dr Arjan Louwen was inaugurated to the Young Academy Leiden. This platform serves to bring young, enthusiastic and driven early career (post-PhD) academics together. ‘I find it a really inspiring and welcoming group.’

Promotores: F.H.J. Redig, W.T.F. den Hollander

Paul Hudson, Associate Professor of Physical Geography at Leiden University College, examines human impacts on lowland rivers in his new book.

Everyone wherever they are in the world can follow free online academic courses offered by Leiden University.

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.

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

Promotor: W.Th.F. den Hollander Co-Promotor: F.M. Spieksma

Recent study led at the Leiden Observatory has observed Orion with unprecedented detail. New data from the Atacama Large Millimeter/submillimeter Array (ALMA) and other telescopes have been used to create this stunning image showing a web of filaments in the Orion Nebula. These features appear red-hot…

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…

ALMA has observed stars like the Sun at a very early stage in their formation and found traces of methyl isocyanate - a chemical building block of life. This is the first ever detection of this prebiotic molecule towards solar-type protostars, the sort from which our Solar System evolved. The discovery…