Kepler-411: a four-planet system with an active host star L. Sun, P. Ioannidis, S. Gu, J. H. M. M. Schmitt, X. Wang and M. B. N. Kouwenhoven A&A, 624 (2019) A15 Published online: 02 April 2019 DOI: 10.1051/0004-6361/201834275