Interior heating and outgassing of Proxima Centauri b: Identifying critical parameters L. Noack, K. G. Kislyakova, C. P. Johnstone, M. Güdel and L. Fossati A&A, 651 (2021) A103 Published online: 26 July 2021 DOI: 10.1051/0004-6361/202040176