Multiple PhD positions in the fields of cool evolved stars and spectroscopy of intermediate/high-mass stars

Applications are invited for up to three PhD positions at the Institute of Astronomy, KU Leuven, Belgium, to work on the following research projects: 

Project 1: Wind–Planet Interactions in Systems with Cool Evolved Stars -- Deadline 15 March 2026

This project investigates how stellar winds from cool evolved stars interact with orbiting planets, shaping their atmospheric structure, chemistry, and long-term evolution. The work combines hydrodynamical modelling, radiative transfer, and atmospheric chemistry, linked to observational constraints. By probing an unexplored regime of planetary systems, the project aims to improve our understanding of planetary survival and detectability around aging stars, and to advance the physics of star–planet interactions.

Project 2: Theoretical Modelling of Mass Transfer and Orbital Evolution in Eccentric Binaries with Cool Evolved Stars -- Deadline 15 March 2026

This project focuses on theoretical models of orbital evolution driven by non-conservative, phase-dependent mass transfer in eccentric binaries with cool evolved stars. The work involves developing and analysing differential equations describing how mass and angular momentum exchange shape semi-major axis and eccentricity evolution. By exploring diverse binary configurations, the project aims to build a physically grounded framework to interpret observed evolved binary populations.

Project 3: High-resolution spectroscopy of intermediate- and high-mass stars in the context of space missions -- Deadline 22 February 2026

This project uses high-resolution Mercator/HERMES spectroscopy combined with space-based data to improve our understanding of stellar structure and evolution in intermediate- and high-mass binaries. The first part focuses on synergy with Gaia DR4 and targeted ground-based follow-up of systems such as dormant compact-object binaries and stripped stars. The second part involves preparation, commissioning, and early science of the CubeSPEC technology demonstrator mission, including long spectroscopic time series of β Cepheid pulsators.