Coronal X-ray emission and planetary irradiation in HD 209458 S. Czesla, M. Salz, P. C. Schneider, M. Mittag and J. H. M. M. Schmitt A&A, 607 (2017) A101 Published online: 21 November 2017 DOI: 10.1051/0004-6361/201731408