This thesis aims to enhance our understanding of galaxies by testing theoretical models of galaxy formation against observations, particularly in the cases of extreme systems which have been found to have an excess of baryonic mass in their central regions, in the form of either supermassive black holes…

By growing in a soil plants change the biotic and abiotic properties of the soil in which they grow.

Protoplanetary disks are the gas and dust environments where planetary systems form around young stars. Using observations from the Atacama Large Millimeter/submillimeter Array (ALMA) this thesis analyses the gaseous molecular reservoir, using multiple tracers to resolve the 3D structure of protoplanetary…

Detecting planets during their formation stages is crucial for understanding the history and diversity of fully developed planetary systems like our own. However, observing young planets directly is challenging because they are often deeply embedded within their host protoplanetary discs, rich in gas…

Feedback van medestudenten op schrijfwerk is net zo leerzaam als die van docenten. Dat is een van de conclusies uit het onderzoek van Bart Huisman (ICLON). Promotie op 12 september.

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.

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

Promotor: Prof.dr. A.G.G.M. Tielens, Prof.dr. C. Dominik (UvA)

Stellar feedback is a crucial ingredient in the evolution of galaxies.

When a star is born in our Galaxy, it is quite likely that it has formed within a massive cluster, which hosts numerous high-mass stars bathing their lower mass neighbours in UV radiation.

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

Diverse types of exoplanets such as gas giants on close-in orbits (hot Jupiters) and young massive giants on wide orbits (super Jupiters), with no analogs in the Solar System, pose challenges but also opportunities to our understanding of planet formation and evolution.

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…

Promotores: Prof.dr. J. Schaye & Prof.dr. C. Steidel (California Institute of Technology)

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

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

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

Kinderen en jongeren kunnen hun ‘slimme hersengebieden’ wel degelijk gebruiken. Dat laat ontwikkelingspsycholoog Sabine Peters zien in een grootschalig en langlopend hersenonderzoek. De resultaten kunnen van grote betekenis zijn voor het onderwijs. Promotie 27 januari.

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

Consequences for sediment stability and seston trapping

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

Anneke Wurth, promovendus bij het ICLON, wilde zicht krijgen op wat goed werkt in het spreekvaardigheidsonderwijs bij het schoolvak Nederlands in de bovenbouw van havo en vwo. In haar onderzoek kwam de rol van feedback centraal te staan.

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)

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.

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.

Psycholoog Ilse van de Groep heeft ontdekt dat mensen agressiever reageren bij het ontvangen van negatieve feedback. Als mensen echter al hardnekking antisociaal gedrag vertonen reageren ze niet nog agressiever op negatieve feedback.Met dit onderzoek verdiende zij de Koningsheideprijs 2022 voor de wetenschappelijke…

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

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

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

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

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

‘Wat ik aantrekkelijk vind aan het bodemleven, is dat het stuurbaar is,’ verklapt onderzoeker Martijn Bezemer van het Instituut Biologie Leiden (IBL). ‘Dat je kan zeggen: wat wil je? En dat ik de bodem dan kan omtoveren tot iets wat jij nodig hebt. Ten minste, dat dachten we.’

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

Ouders blijken behoorlijk gevoelig voor feedback die ze over hun kind ontvangen. Hoe gevoelig is bovendien afhankelijk van de (‘roze’) bril waarmee ze naar hun kind kijken. Dit alles is terug te zien in hun brein. Neurowetenschapper Lisanne van Houtum en haar Leidse collega’s publiceerden erover in…

According to the amyloid cascade hypothesis, accumulation of beta-amyloid (Aβ) peptides initiates the pathological cascade in Alzheimer's disease (AD).

Zeven masterstudenten lunchten met faculteitsbestuurders Mirjam de Baar (vice-decaan) en Aurelie van ’t Slot (studentlid in het bestuur) in de faculteitskamer van Geesteswetenschappen en bespraken met hen hun ervaringen aan de Universiteit Leiden.

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.

Learning analytics kijkt vooral naar de online leeractiviteiten van studenten. Maar wat als een groot deel van het leren offline, buiten digitale ogen, plaatsvindt? In dit learning analytics project doen we onderzoek naar wat voor remediëringsactiviteiten, online en offline, ondernemen nadat ze gepersonaliseerd…

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

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