For centuries astronomers studied the Universe by collecting light. Nowadays, we are living in times of great technological advancements, which allow us to explore our Universe in a new way - though gravitational wave radiation.

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

It has now been well established that shocks and turbulent motions in the intra-cluster medium (ICM) generated through cluster mergers can produce large-scale synchrotron emission.

One of the key limitations of the direct imaging of exoplanets at small angular separations are quasi-static speckles that originate from evolving non-common path aberrations (NCPA) to which the primary adaptive optics system is inherently blind. The main focus of this thesis is the development and…

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

Astronomen willen het heelal begrijpen, van de Oerknal tot nu, en hoe dit verder zal gaan. In Leiden concentreren ze zich daarbij op twee vragen: 'Hoe ontstaan sterren en planeten? en 'Hoe ontstonden in het jonge heelal sterrenstelsels en zwarte gaten?' Een nieuwe generatie telescopen – net klaar of…

Promotor: T. Hankemeier, Co-promotor: T.H. Reijmers

Promotores: H. Schiessel, G.T. Barkema

Many galaxy clusters exhibit bright diffuse radio emission that traces the underlying structure of the intracluster medium (ICM).

Promotor: K. Kuijken, Co-Promotor: H. Hoekstra

Despite the history of studies on methanol formation from CO2, the dominant elementary reaction steps that constitute the chemical mechanism for this catalyzed process are not determined.

The research presented in this thesis makes use of small molecules (as H2 , D2 and O2 ) on well-defined single crystal surfaces (flat Pt(111), flat Cu(211) and curved Pt(111)) to elucidate the role of surface structure and degrees of freedom in the reactant in specific surface reactions.

Streptomyces are bacteria abundant in soil that participate in diverse and complex interactions. These bacteria are the main producers of the antibiotics we currently use in the clinic.

Promotor: J.W.M. Frenken

Building a Deep Cross-media Transfer Network to extract visual relations that relieve the problem of insufficient training data for visual tasks.

The aim of the research presented in this thesis was to develop new methods forchallenging systems in liquid-state NMR using paramagnetic effects generated by thetwo-armed probe CLaNP-5.

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

Promotor: H.V.J. Linnartz

Promotor: Prof.dr. M.L. van Hecke

Promotor: Prof.dr. F.S. de Boer, Co-promotor: D. Clarke

Promotor: Prof.dr. T. Hankemeier, Co-promotor: Theo Reijmers

Promotor: Jelle S. Kaastra Co-promotor: Jelle de Plaa

A remarkable population of short period transiting rocky exoplanets with equilibrium temperatures on the order of 2,000 K has recently been discovered.

Promotor: W. Jiskoot, Co-promotor: A. Hawe

Waarnemingen met ESO’s Very Large Telescope (VLT) onder leiding van Ignas Snellen hebben, voor het eerst, de rotatiesnelheid van een exoplaneet opgeleverd. Gebleken is dat een dag op Bèta Pictoris b slechts acht uur duurt – veel korter dan de dagen op de planeten van ons zonnestelsel. Het onderzoek…

Promotor: Prof.dr. G.R. de Snoo, Prof.dr. G.A. Persoon, Co-promotor: H.H. de Iongh

In this thesis, I studied the origin and evolution of the non-thermal radiation in merging galaxy clusters.

Humans share meaning through language. Over time, repeated interactions have shaped languages into forms that match our cognitive preferences, making them structured, expressive, easy to learn, and ultimately, meaningful.

This dissertation is organised into three parts, each addressing a distinct research area related to Gibbs measures.

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

Hoogwaardige technologische innovatie voor bedrijfsleven en consumenten dankzij toponderzoek naar het heelal en de quantumwereld.

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.

Humans can see the world through the eyes of other humans and imagine what they know, want, and intend. This competence is known as Theory of Mind.

We have studied shape with a particular focus on the zebrafish model system. The shape is an essential appearance of the phenotype of a biological specimen and it can be used to read out a current state or response or to study gene expression.

Cholesterol influences many pathways, including serving as precursor for adrenal steroidogenesis. Imbalance of cholesterol levels has been implicated in several diseases including cardiovascular diseases and its underlying pathology, atherosclerosis.

Astronomen hebben met behulp van ALMA een gebied rond een jonge ster in beeld gebracht waar stofdeeltjes kunnen groeien. Het is voor het eerst dat zo’n ‘stofval’ duidelijk is geïdentificeerd. In een stofval kunnen minuscule stofdeeltjes in schijven rond sterren zo groot worden dat ze uiteindelijk kometen,…

Het heelal heeft veel meer massa dan we kunnen aantonen. Zien we iets over het hoofd, of gebruiken we foutieve rekenmodellen? Margot Brouwer vertelt erover tijdens de Nacht van Kunst & Kennis op 16 september.

Scherpe nieuwe opnamen laten opvallende structuren zien in de planeetvormende schijven rond jonge sterren. Daarover publiceren verschillende teams astronomen, onder wie Leidse sterrenkundigen Jos de Boer en Christian Ginski.

Joseph Callingham van de Leidse Sterrewacht ontvangt de Louise Webster Prijs voor uitmuntend post-doc onderzoek. Calligham krijgt de prijs van de Astronomical Society of Australia voor zijn geslaagde zoektocht naar het meest extreme object in het heelal.

NWO heeft in het programma ‘Investeringen NWO-middelgroot’ subsidies toegekend voor de aanschaf van apparatuur, het opzetten van dataverzamelingen en het maken van software en bibliografieën. Van de 31 subsidies gaan er vijf naar voorstellen van de Universiteit Leiden.

The first direct detection of gravitational waves opened the possibility of mapping the Universe via this new and independent messenger.

Promotor: Prof.dr. W.Th.F. den Hollander, Co-promotor: R. Fernandez.

The LOFAR radio telescope produces petabytes of data every year. Radio Astronomers use complex multi-step pipelines to process this data and produce scientific images.

Stochastic resetting is simple enough to be approached analytically, yet modifies stochastic processes in a non-trivial way.

Three major cosmology-focused missions are planned for the next decade: the Euclid space telescope, the Vera C. Rubin Observatory in Chile, and the Nancy Grace Roman Space Telescope.

This thesis explores Breaking of Ensemble Equivalence (BEE) in random graph models by examining the spectral properties of adjacency matrices. The goal is to identify spectral characteristics that differentiate random graph ensembles, enhancing the understanding of complex network structures and beh…