Deep high-resolution L band spectroscopy in the β Pictoris planetary system Markus Janson, Jonas Wehrung-Montpezat, Ansgar Wehrhahn, Alexis Brandeker, Gayathri Viswanath, Paul Mollière and Thomas Stolker A&A, 694 (2025) A63 Published online: 04 February 2025 DOI: 10.1051/0004-6361/202452411