The Peculiar Chemical Pattern of the WASP-160 Binary System: Signatures of Planetary Formation and Evolution

JOFRE, E.; PETRUCCI, R.; GÓMEZ MAQUEO CHEW, Y.; RAMÍREZ, I.; SAFFE, C.; MARTIOLI, E.; BUCCINO, A. P.; MAEK, M.; GARCÍA, L.; CANUL, E. F.; GOMEZ, M.

Workshop; The Star-Planet Connection; 2021

Wide binary stars with similar components hosting planets provide a favorable opportunity for exploring the star-planet chemical connection. In this contribution, we present a detailed characterization of the solar-type stars in the WASP-160 binary system. No planet has been reported yet around WASP-160A while WASP-160B is known to host a transiting Saturn-mass planet, WASP-160B b. For this planet, we also derive updated properties from both literature and new observations. Furthermore, using TESS photometry, we constrain the presence of transiting planets around WASP-160A and additional ones around WASP-160B. The stellar characterization includes, for the first time, the computation of high-precision differential atmospheric and chemical abundances based on high-quality Gemini-GRACES spectra. Our analysis reveals evidence of a correlation between the differential abundances and the condensation temperatures of the elements. In particular, we find both a small but significant deficit of volatiles and an enhancement of refractory elements in WASP-160B relative to WASP-160A. After WASP94, this is the seconstellar pair among the shortlist of planet-hosting binaries showing this kind of anomalous chemical pattern. Although we discuss several plausible planet formation and evolution scenarios for WASP-160A and B that could explain the observed chemical pattern, none of them can be conclusively accepted or rejected.