Signatures of rocky planet engulfment in HAT-P-4 - Implications for chemical tagging studies C. Saffe, E. Jofré, E. Martioli, M. Flores, R. Petrucci and M. Jaque Arancibia A&A, 604 (2017) L4 Published online: 31 July 2017 DOI: 10.1051/0004-6361/201731430