Program: GN-2019A-Q-122

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 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 a differential analysis of binary systems with "twin" components. To date, only 8 of these systems hosting at least one planet/disc are known. Only half of them have been analyzed by independent teams using different quality data-sets. In some cases, the first interpretations were confirmed, but for other systems subsequent studies found contrary results. Moreover, recently, it has been suggested that opposite results can be due to time-dependent effects in individual spectra. Given the possible connection between planet formation and stellar host composition, it is critical to revise those systems without previous verification from high quality data. In this context, we propose to perform the first independent detailed analysis in three of these twin binary systems from GRACES higher quality spectra.