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…

Complex Organic Molecules (COMs) have been detected in objects across different stages of stellar evolution.

This thesis mainly extends the theory of positive operators on Riesz spaces to a setting of pre-Riesz spaces.

Promotor: A. Doelman, Co-promotor: M.F.E. de Jeu

Promotor: S.M. Verduyn Lunel, Co-promotor: S.C. Hille

This book focuses on transnationalism as a key concept to evaluate how Europe responds to cross-border security challenges.

Een team van Europese astronomen heeft een weersysteem op basis van silicaat gevonden op een wollige gasplaneet rond de ster WASP-107. Het is voor het eerst dat astronomen zandwolken en -regen vinden. Ze concluderen bovendien dat de temperatuur dieper in de atmosfeer snel stijgt. 'De aanwezigheid van…

Promotor: R. Verpoorte, Co-promotores: Y.H.Choi, N.R. Mustafa

Promotor: S.M. Verduyn Lunel, Co-promotor: O.W. van Gaans

Polycyclic aromatic hydrocarbons (PAHs) are the most abundant class of organic compounds in space. The PAH field evolves from the constant interaction between experimentalists, theorists, modellers and observers. While laboratory research and quantum chemical calculations together set up the molecular…

Leiden University’s Master of Laws in Air and Space Law (LL.M.) looks at public air law, private air law and space law from a European and an international perspective.

Hoe worden nachtruimtes verbeeld, geproduceerd, ervaren en verteld door migrantengemeenschappen in Europa? Dit onderzoeksproject onderzoekt deze vraag in acht Europese steden: Aarhus, Amsterdam, Berlijn, Cork, Galway, Lissabon, Londen en Rotterdam.

Astronomical observations of cold regions in the universe show a rich inventory of ices. Part of these ices may end up on planets like our own, but in that journey they will be exposed to considerable amounts of radiation.

The sequence-dependence of biomolecular interactions involving nucleic acids and proteins is essential for numerous processes inside the cell. Insights into the underlying molecular mechanisms have been obtained using various biochemical and biophysical methods on two different levels — bulk and sin…

One of the key discoveries in exoplanet research over the past decade is the abundance of small planets in our Milky Way. Despite their high numbers, our understanding of their atmospheres remains limited, and it is unknown if they possess atmospheres at all.

Promotor: Prof.dr. T.H.W. Bäck

In this thesis we study the moduli space of genus g curves, and the differential forms that occur naturally on this moduli space.

Promotor: S.M. Verduyn Lunel, Co-promotores: M.F.E. de Jeu, B. de Pagter

Op 29 mei verdedigde Dimitra Stefoudi het proefschrift 'Juridische en beleidsmatige aspecten van space big data: juridische implicaties van het gebruik van grote hoeveelheden ruimtedata – regulerende oplossingen en beleidsaanbevelingen'. Het promotieonderzoek is begeleid door Steven Truxal en Bart C…

In this thesis we construct an extension associated with the Furstenberg compactification of symmetric space of noncompact type. From this extension we get a cycle in equivariant KK-theory representing the extension. The construction of the extension and the corresponding cycle is a generalization of…

The Standard Model (SM) of particle physics fails to explain several observed phenomena and is incomplete. In order to resolve this problem, one may extend the SM by adding new particles.

The subject of this thesis, ‘Approach to Markov Operators on Spaces of Measures by Means of Equicontinuity’, combines an analytical and probabilistic approach to Markov operators.

This thesis examines silicon pore optics (SPO), a technology that exploits silicon wafers from the semiconductor industry to create extremely high quality X-ray optics, by studying its manufacturing process, applications, and prospects.

Havensteden zijn bijzonder in de wijze waarop ze ruimtelijkheid, economische activiteit en culturele waarden combineren. Het zijn vaak robuuste steden die kansen, rijkdom en innovatie bieden aan hun landen en hun inwoners. Maar havensteden geven ook grenzen weer, wat zich weerspiegeld in gemarginaliseerde…

The key purpose of this project is to study tautological relations on the level of closed differential forms or even integral cochains (i.e. we don't take classes in cohomology).

James Webb life’s building blocks

Na 25 jaar is het deze december eindelijk zo ver: de lancering van de lang verwachte James Webb ruimtetelescoop. Leidse astronomen kijken vol spanning mee: niet alleen waren zij betrokken bij de bouw van belangrijke instrumenten aan boord, de telescoop zal ook vele nieuwe geheimen van het heelal onthullen,…

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.

Glycoside hydrolases (glycosidases/GHs) are widely abundant enzymes in all kingdoms of life and are important biocatalysts that catalyze the hydrolysis of glycosidic linkages in oligo/polysaccharides, glycoproteins and glycolipids with tremendous efficiency

Until the 1990s, the only known planets were those in our Solar System. Three decades later, several thousand exoplanets have been discovered orbiting stars other than the Sun, and substantial efforts have been made to explore these strange new worlds through spectroscopic analyses of their atmosphe…

The space between the stars isn't simply a void; it also contains substances such as methanol and carbon dioxide. So far, chemical theories have been unable to explain how these substances originate under circumstances that should make it impossible. Fedor Goumans has been awarded a Veni subsidy to…

De uitlijning van de James Webb-ruimtetelescoop is voltooid. Het ruimteobservatorium is in staat scherpe, goed gerichte beelden vast te leggen met elk van zijn vier krachtige wetenschappelijke instrumenten aan boord. Het MIRI-instrument, waar onder andere hoogleraar Moleculaire Astrofysica Ewine van…

Op 20 juni promoveert Camil Staps. Het Leiden University Centre for Linguistics feliciteert Camil!

De James Webb Space Telescope komt met zijn eerste foto van een exoplaneet: een planeet die draait om een andere ster dan onze zon. Astronomen zijn verheugd over het kiekje, dat planeet HIP 65426 b laat zien in niet eerder waargenomen golflengten. Ignas Snellen vertelt erover aan De Volkskrant.

Op 18 juni 2019 verdedigde Neta Palkovitz Menashy haar proefschrift 'Regulating a Revolution: Small Satellites and the Law of Outer Space'. Het promotieonderzoek is begeleid door promotoren prof. dr. P.M.J. Mendes de Leon en prof. dr. G. Molier.

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).

Antibiotic-resistant bacteria pose a major health threat. Addressing this challenge requires among others the development of new antibacterial compounds. The research described in this thesis focuses on discovering novel antibiotics from soil bacteria, specifically Streptomyces and Paenibacillus.Despite…

Een internationaal team van sterrenkundigen onder wie de Leidse hoogleraar Ewine van Dishoeck heeft voor het eerst het gas benzeen (C6H6) waargenomen in een planeetvormende schijf rond een jonge ster. De waarnemingen vertellen ons meer over het ontstaan van planeten in deze schijf, zoals ook onze aarde.…

Plant diversity is essential for us and our planet as it sustains the stability of our ecosystems, provides vital materials and food to us and supports many ecosystem services.