Research

A popular-science introduction to the questions I am interested in can be found in an article at science.nasa.gov.

I am a PhD candidate in the Astrophysical Plasma Theory Group at the Max-Planck Institute for Nuclear Physics. I am interested in the acceleration of cosmic rays in the environments of young star clusters. Concretely, I construct physical models of gamma-ray emission and perform magnetohydrodynamical simulations to understand flows and magnetic fields around young star clusters.

Data from my simulations are publicly available on edmond.

Some of my recent works are:

• M. Lemoine-Goumard, L. Härer, L. Mohrmann (equally contributing) et al. ``A cosmic-ray loaded outflow driven by a massive star cluster’’. 2025, Nature Communications, 16, 10820. DOI 10.1038/s41467-025-65592-4.

• L. Härer et al. ``Deciphering the γ-ray emission in the Cygnus region’’. 2025, Astronomy & Astrophysics, 703, A111. DOI 10.1051/0004-6361/202555531.

• L. Härer et al. ``Stellar-wind feedback and magnetic fields around young compact star clusters: 3D magnetohydrodynamics simulations’’. 2025, Astronomy & Astrophysics, 698, A6. DOI 10.1051/0004-6361/202554057.

• L. Härer et al. ``Understanding the TeV γ-ray emission surrounding the young massive star cluster Westerlund 1’’. 2023, Astronomy & Astrophysics, 671, A4. DOI 10.1051/0004-6361/202245444.

A full list of my publications can be found on ADS. On ORCID, I do not list conference proceedings and publications within large collaborations, unless I provided specific scientific input.