Applications are invited for a 4-year PhD position at the Laboratory for Astrophysics (LfA) in Leiden Observatory, as part of the NWA-ORC Prelife project “Inheritance versus reset: survival of organic molecules from molecular clouds to larger icy bodies.” This PhD project will experimentally investigate how icy grains evolve after being incorporated into protoplanetary disks and evaluate the results through kinetic modeling. The aim is to uncover the physicochemical processes that connect the chemical composition of interstellar ice mantles with that of larger bodies such as comets and planetesimals. In the dynamic environment of planet-forming regions, radiation ranging from X-rays to UV and infrared photons drives the chemical evolution of icy grains. These processes alter the composition and structure of the ices, ultimately shaping the inventory of elements/organics available for planet formation.
Using newly developed laboratory equipment, we will study two distinct types of ice-dust aggregates: well-mixed icy pebbles containing both volatiles and refractory grains, and layered structures with a refractory core and an ice mantle. These configurations may lead to entirely different chemical pathways.
The scientific goal is to identify solid-state reaction networks in these structurally diverse systems and determine key reaction parameters under controlled conditions. The experimental findings will be analyzed by kinetic modelling, and the results will feed into protoplanetary disk models that assess the survival of organic molecules. This interdisciplinary project, combining laboratory work and modeling, will shed light on a fundamental question of our chemical origins: inheritance versus reset.
We are seeking an enthusiastic and motivated candidate with a solid background in experimental physics or chemistry. The ideal applicant has recently completed, or is about to complete, a Master’s degree in a relevant field. Strong communication skills in English—both written and spoken—are essential. Experience with ultra-high vacuum (UHV) systems, cryogenic techniques, and scientific programming is particularly advantageous.
The PhD position will be based at the Laboratory for Astrophysics within Leiden Observatory, and will be supervised by Dr. Ko-Ju Chuang and Prof. Dr. Herma Cuppen (Radboud University). The candidate will join a national research consortium exploring fundamental questions related to the Origins of Life, including: How did life arise on Earth? and How likely are similar conditions elsewhere in the universe? More details about the program and participating projects can be found at: prelife.originscenter.nl.
Leiden University’s Faculty of Science is a vibrant and internationally oriented environment where researchers and students collaborate across disciplines to expand the frontiers of knowledge. Research at the faculty spans a broad spectrum: mathematics, artificial intelligence, computer science, astronomy, physics, chemistry, bio-pharmaceutical sciences, biology, and environmental sciences. With over 1,300 staff members and nearly 4,000 students, the faculty has experienced significant growth and is situated in the heart of the Leiden Bio Science Park—one of Europe’s largest science hubs, fostering close interaction between academia and industry.
For more information, please visit: https://www.universiteitleiden.nl/en/science/about-faculty-of-science
Leiden Observatory is the astronomical institute of the Faculty of Science at Leiden University. With a rich history and a leading role in international astronomy, we offer a dynamic work environment where cutting-edge research and top-level education come together. Our academic programs include a Bachelor and Master degree, complemented by a renowned PhD program. Together with over 180 dedicated staff members, we are committed to academic innovation and fostering a close-knit, inclusive community where everyone feels welcome and valued. For more information about Leiden Observatory, see here
All our PhD candidates are embedded in the Leiden University Graduate School of Science.
Leiden University is strongly committed to diversity within its community and especially welcomes applications from members of underrepresented groups.
To apply for this position, please submit the following documents in PDF format:
Please ensure that your application includes the names of two individuals who are willing to provide a letter of recommendation upon request.
Applications will be accepted until 15 June 2025, with the preferred starting date between September and November 2025.