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

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.

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

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

Promotor: Arjen Doelman, Co-promotor: Vivi Rottschäfer

Promotor: M. Franx, Co-Promotor: I.F. Labbé

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

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

Promotores: Prof.dr. M. Franx, Prof.dr. M. Kriek (Univ. of California at Berkeley)

On 5 and 6 june 2024, the conference The Senses, Cognition, and the Body in Medieval Devotional Practices is organised at the University of Padova. The organisers welcome abstracts for 25-minute papers in English or Italian, to be submitted by November 30.

Stars like the sun are born in large molecular clouds existing from gas and dust. During the formation process, the chemical composition of the material can be altered drastically by the changing physical conditions.

Understanding how galaxies form, interact, and evolve comes largely from comparing theory predictions with observational data. Numerical simulations of galaxies provide the most accurate approach to testing the theory, as they follow the non-linear evolution of gas and dark matter in great detail and…

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.

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.

Promotor: Prof.dr. J. Schaye, Co-promotor: Marcello Cacciato

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

This thesis focusses on the temperature structure in protoplanetary disks. The relation between structures seen in the dust and gas-phase molecules is investigated.

Galaxies in the local Universe fall into two main categories of spirals and ellipticals. In this Thesis, we explore the structural evolution of galaxies into this bimodal distribution.

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

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

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

Promotor: Prof.dr. C.U. Keller

Lezing

The aim of this workshop is to open up the discussion of textual communities in Late Antiquity and the early Middle Ages, by offering a platform for PhD students from all over the world and from various disciplines to present their own research and discuss it with others. Deadline: April 23.

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

Congres/symposium

Promotor: Prof.dr. H.V.J. Linnartz, Co-Promotores: S. Ioppolo, H.M. Cuppen

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.

De sectie Cognitieve Psychologie draagt bij aan de 3-jarige bacheloropleiding en verzorgt 2 masterspecialisaties.

In astronomy, the interpration of observations and measurements plays a crucial role: we rely purely and fundamentally on the information that reaches us as observers. And 80% of all matter in the universe is undetectable directly.

One of the effects of climate change is the phenomenon of desertification, a process that occurs in semi-arid and arid areas and causes land degradation as well as vegetation loss. Due to the lack of resources, vegetation self-organizes to sustain itself by forming large-scale spatial patterns.

Pseudomonas Aeruginosa is a Gram-negative bacterium which can form biofilms, increasing its resistance against antibiotics and the host immune system. Polysaccharides are an integral part of this biofilm, one of these polysaccharides is called Psl. PslG is a glycosidase, able to cleave this polysaccharide,…

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.

Sterrenkundigen onder leiding van John Tobin hebben dankzij nieuwe waarnemingen, verricht met de Amerikaanse Very Large Array-radiotelescoop (VLA), meer inzicht verkregen in het geboorteproces van meervoudige sterren.

Cursus, Summer School

Een lijst met wetenschappelijke publicaties samengesteld door het team van het TRIXY Expertisecentrum.

Om te worden toegelaten tot Nederlandse Taalkunde aan de Universiteit Leiden, moet je aan de onderstaande toelatingseisen voldoen.

Promotores: Prof.dr. F.P. Israel, Prof.dr. P.P. van der Werf

Promotor: Johan Kuiper, Co-promotor: Saskia C.A. de Jager

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).

Bacteria have the ability to alter their morphology in order to adapt to changing environments.

In this thesis, I study the formation of large-scale structure and the physics of particle acceleration at large scales (~Mpc).

The aromatic infrared bands (AIBs) seen throughout the interstellar medium (ISM) are generally thought to be carried by polycyclic aromatic hydrocarbons (PAHs) and their nitrogen analogues (PANHs).

Vast, often populated, areas in dryland ecosystems face the dangers of desertification.

This thesis focuses on amyloid proteins, a class of proteins that convert into amyloid fibrils.

Almost all bacteria are enveloped by a cell wall that provides cellular protection.

In de masteropleiding Linguistics (specialisation) van de Universiteit Leiden kun je kiezen uit acht thema's: Applied Linguistics; Comparative Indo-European Linguistics; Computational Linguistics; Language and Communication; Language Description and Documentation; Language Processing and Cognition;…

De Leiden Institute for Brain and Cognition (LIBC) Publieksdag, met als thema 'geheugensporen', trok ruim 700 bezoekers.

Het LIBC is actief betrokken bij training & onderwijs op het gebied van hersenen en cognitie.

Het Leiden Institute for Brain and Cognition is een netwerk dat zich richt op het stimuleren van interdisciplinaire uitwisseling van kennis en expertise over onderwerpen gerelateerd aan hersenen en cognitie wordt gestimuleerd. Daarnaast maakt het zich sterk voor wetenschappelijke valorisatie en outreach.…