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Wide binary stars with similar components hosting planets provide a favorableopportunity for exploring the star-planet chemical connection. We perform adetailed characterization of the solar-type stars in the WASP-160 binarysystem. No planet has been reported yet around WASP-160A while WASP-160B isknown to host a transiting Saturn-mass planet, WASP-160B b. For this planet, wealso derive updated properties from both literature and new observations.Furthermore, using TESS photometry, we constrain the presence of transitingplanets around WASP-160A and additional ones around WASP-160B. The stellarcharacterization includes, for the first time, the computation ofhigh-precision differential atmospheric and chemical abundances of 25 elementsbased on high-quality Gemini-GRACES spectra. Our analysis reveals evidence of acorrelation between the differential abundances and the condensationtemperatures of the elements. In particular, we find both a small butsignificant deficit of volatiles and an enhancement of refractory elements inWASP-160B relative to WASP-160A. After WASP-94, this is the second stellar pairamong the shortlist of planet-hosting binaries showing this kind of peculiarchemical pattern. Although we discuss several plausible planet formation andevolution scenarios for WASP-160A and B that could explain the observedchemical pattern, none of them can be conclusively accepted or rejected. Futurehigh-precision photometric and spectroscopic follow-up, as well ashigh-contrast imaging observations, of WASP-160A and B, might provide furtherconstraints on the real origin of the detected chemical differences.

The peculiar chemical pattern of the WASP-160 binary system: signatures of planetary formation and evolution?