Program: GN-2020A-Q-126

Detailed chemical abundances of planet-hosting stars are a vital tool to our understanding of planet formation and evolution. It has been suggested that a correlation between chemical abundances and condensation temperature (Tc) might be a possible signature of planet formation and evolution (e.g., Meléndez et al. 2009, 2017). However, the detection of this signature is a challenging task that requires the highest precision in stellar abundances (<0.01 dex), which is only possible through differential analysis of binary systems with similar components. To date, only 4 binary systems with similar components, where one of the stars hosts a planet, have been studied via a strictly differential analysis. Given the possible link between planet formation and stellar composition, it is critical to increase the sample of binary systems hosting planets exposed to high-precision differential abundance analysis. In this context, from high-quality GRACES spectra, we propose to perform a high-precision differential chemical analysis of the exceptional binary systems with planets HD 202772 A/B and HD 132563 A/B. A few short observations will allow us to test, for the first time, the signature of planet formation in these systems and to provide constraints on close-in giant planet formation and evolution.