Signatures of rocky planet engulfment in HAT-P-4 - Implications for chemical tagging studies

摘要

Aims. We aim to explore the possible chemical signature of planet formation in the binary system HAT-P-4 by studying the trends of abundance vs. condensation temperature Tc. The star HAT-P-4 hosts a planet detected by transits, while its stellar companion does not have any detected planet. We also study the lithium content, which might shed light on the problem of Li? depletion in exoplanet host stars.