Upper limits on CN from exocomets transiting β Pictoris M. A. Kenworthy, E. de Mooij, A. Brandeker, C. Opitom, F. Kiefer and A. Fitzsimmons A&A, 698 (2025) A10 Published online: 23 May 2025 DOI: 10.1051/0004-6361/202554073