A new heavy anion in IRC + 10216: Theory favors C10H− versus C9N− J. R. Pardo, C. Cabezas, M. Agúndez, B. Tercero, N. Marcelino, P. de Vicente, M. Guélin and J. Cernicharo A&A, 677 (2023) A55 Published online: 04 September 2023 DOI: 10.1051/0004-6361/202346498