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

Promotores: Prof.dr. A.G.G.M. Tielens, Prof.dr. L.B.F.M. Waters (UvA), Prof.dr. C. Dominik (UvA)

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

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.

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

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

A large diversity of exoplanetary systems has been found, but it is still unclear what drives this diversity.

What is the origin of solar systems?

Promotor: C.U. Keller, Co-Promotor: F. Snik

The Layered Heart : Essays on Persian Poetry is published in celebration of the poet and scholar Dick Davis, dubbed “our pre-eminent translator from Persian” by The Washington Post.

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…

In the discs of dust and gasses around young stars, mysterious structures occur. Together with professor Ewine van Dishoeck, PhD student Paolo Cazzoletti investigate how we can explain these forms, such as rings, spirals and holes. On 12 December, he will defend his thesis.

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

Promotor: E. F. van Dishoeck, Co-promotor: C. Walsh

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…

LUMC professor and gynaecologist Dick Oepkes was made a Knight of the Order of the Netherlands Lion on 15 April. Mayor Henri Lenferink presented him with the medal at the end of on online symposium to mark Oepkes’ retirement.

Research using the ALMA telescope by scientists including Leiden's John Tobin and Steven Bos has produced the first images of the water snow line within a protoplanetary disc. Publication in Nature on 14 July.

To address the fundamental questions of how life on Earth emerged and how common life may be in the Universe, it is crucial to know the chemical composition of the planet-forming material.

In 2017 saxophonist Dick de Graaf obtained his PhD degree with his thesis 'Beyond borders : broadening the artistic palette of (composing) improvisers in jazz'. His own views for over forty years on jazz and related styles (amongst other qualities) have lead to the Edison Jazz Oeuvre Prize.

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

The Dick Stufkens Prijs 2010 is awarded to Dr. Niels Elders. The prize is given by the Holland Research School of Molecular Chemistry for his Ph.D. thesis “Multicomponent Approaches to Molecular Diversity & Complexity”, in which he describes the development of various new multi-component synthetic procedures…

The Dick Stufkens Prize 2017 for the best PhD thesis of the Holland Research School of Molecular Chemistry (HRSMC) is awarded to Dr Sven Askes. In his thesis

The Dick Stufkens Prize 2018 for the best PhD thesis of the Holland Research School of Molecular Chemistry (HRSMC) will be awarded to Dr Stefan Vuckovic. In his thesis, Vuckovic presents a new and innovative approach to the quantum mechanical calculation of atomic and molecular energies. It lays the…

The Dick Stufkens Prize 2020 for the best PhD thesis of the Holland Research School of Molecular Chemistry has been awarded to Dr Mark Koenis. Koenis graduated 21 February with the distinction cum laude on his thesis 'Advanced Spectra Analysis to Determine Complex Structure and Chirality'. He describes…

The Dick Stufkens Prijs for the best PhD thesis of the Holland Research School of Molecular Chemistry (HRSMC) has been awarded to Dr Tatu S. Kumpulainen for his thesis “Proton-Transfer Reactions in ‘Super’ Photoacids and Supramolecular Assemblies”. It describes his innovative research into methods for…

The Dick Stufkens Prize 2021 for the best PhD thesis of the Holland Research School of Molecular Chemistry (HRSMC) has been awarded to Klaas van Leest for his thesis 'Open- Shell Cobalt Complexes with Redox-Active Ligands; Electronic Structure and Nitrene Transfer Reactivity'. Van Leest, who is now…

The Dick Stufkens Prize 2019 for the best PhD thesis of the Holland Research School of Molecular Chemistry (HRSMC) will be awarded to Thom Hersbach. In his thesis, Hersbach presents a thorough analysis of cathodic corrosion. His comprehensive research, on which he graduated with the distinction cum…

The formation of stars and planets happens over multiple scales, which can interact. In particular, planet formation happens in the dense, complex environment of star forming regions.

This thesis discusses the physical and chemical processes than influence the composition of forming planets.

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

Dick Schoof kan ook wel de buurman van de Haagse faculteit worden genoemd. Vooral vanuit zijn rol bij de NCTV werkte hij veel samen met de Universiteit Leiden en hielp hij onderwijs en onderzoek vooruit, vertelt hoogleraar Terrorisme en Contraterrorisme Edwin Bakker. ‘Voor een kritische vriend was altijd…

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.

The focus of this thesis is how stars like our Sun and planets like Jupiter, Saturn, and Earth are formed.

We have conducted a full spectral line survey of the 3-13 micron region of two massive protostars, AFGL 2591 and AFGL 2136, for the first time at high spectral resolution.

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

Planet formation is a surprisingly homogeneous process that does not take place gradually from inside out, but that occurs everywhere at the same time in a proto-planetary disc, as Dave Lommen has discovered. He will obtain his doctorate this week based on his research into the dust around young stars…

Walsh

All comets might share their place of birth, new research says. For the first time ever, astronomer Christian Eistrup applied chemical models to fourteen well-known comets, surprisingly finding a clear pattern. His publication has been accepted in the journal Astronomy & Astrophysics.

Astronomer Jos de Boer has received the Chesneau Prize in Nice for his research into so-called protoplanetary disks. The prize is awarded to the best astronomical dissertation in the field of high angular resolution. 'I consider it a good opportunity to talk about my research.'

A team of scientists, including Leiden Astronomer Alice Booth, has discovered silicon monosulfide molecules in the dust disk around a young star. Such molecules indicate planet formation. The team made the discovery using the ALMA telescopes. This method provides an alternative when direct observation…