Europium as a lodestar: diagnosis of radiogenic heat production in terrestrial exoplanets - Spectroscopic determination of Eu abundances in α Centauri ABH. S. Wang, T. Morel, S. P. Quanz and S. J. MojzsisA&A, 644 (2020) A19DOI: https://doi.org/10.1051/0004-6361/202038386