The Institute of Astronomy (IoA) at KU Leuven in Belgium is offering two PhD opportunities focused on the interactions between winds, planets, and binaries in systems with cool evolved stars. The IoA is a dynamic research group comprising around 80 scientists, engineers, and staff, and is recognized as an expertise center in stellar physics. The institute is actively involved in international collaborations and provides access to advanced computing facilities and the Mercator telescope at La Palma Observatory.

Project 1: Wind–Planet Interactions in Systems with Cool Evolved Stars. This project investigates how intense stellar winds and high mass-loss rates from cool evolved stars affect the atmospheres of orbiting planets. The research combines hydrodynamical modelling, radiative transfer, and atmospheric chemistry, and is closely linked to observations from ALMA, JWST, and Gaia. The goal is to understand the fate and observability of planets around aging stars and to advance knowledge of star–planet interaction physics.

Project 2: Theoretical Modelling of Mass Transfer and Orbital Evolution in Eccentric Binaries with Cool Evolved Stars. This project develops theoretical models to describe the evolution of binary orbits under non-conservative, phase-dependent mass transfer, with a focus on angular momentum budgets and their effects on orbital parameters. The research involves solving differential equations to capture the interplay between orbital dynamics and mass exchange, aiming to provide a framework for interpreting evolved binary populations.

Eligibility: Applicants should hold a MSc degree in astrophysics, physics, mathematics, or an equivalent qualification by the start of the PhD. Proficiency in English is required. Candidates with interests and experience in stellar astrophysics, computational (astro)physics, programming, and problem-solving are strongly encouraged to apply. The ability to work in a team and a commitment to scientific research are essential.

Funding: Successful candidates will receive a 1-year tax-free bursary contract, renewable for up to 4 years after positive evaluation. The bursary amount matches the net salary of a research assistant (salary scale 43) and includes a comprehensive benefits package: holiday and end-of-year bonuses, holiday allowance, free hospital insurance, free public transport, bicycle allowance, staff discounts, and access to sports and cultural facilities.

Doctoral Program: PhD students will register at the Arenberg Doctoral School and participate in a program that includes training in management, science communication, and teaching. Up to 20% of time will be dedicated to service duties such as teaching, supervision, and observing runs for IoA monitoring programs.

Application Process: Applications must be submitted by March 15th, 2026. Required documents include a CV (with publication list and two reference contacts), a statement of interest, a summary of research experience, and transcripts of university courses and grades. Shortlisted candidates will be interviewed in April 2026. For further information, contact Prof. dr. Leen Decin or Mrs. Clio Gielen via email.

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