1) Speaker: T.A. Ryabchikova (INASAN)

Title: Differential abundance analysis of the stars in wide pairs of different metallicity with exoplanets.

Abstract: The best check of the possible effect of planet formation on the abundance pattern of the host star is the differential abundance analysis of the wide binary components with the exoplanet orbiting one of them. Such kind of analysis was performed earlier for several binaries with diverging interpretation. We performed an independent abundance analysis for 4 binaries in the -3.7 — +3.5~dex metallicity range based on the line spectrum synthesis in high-resolution stellar spectra. Abundances of 28 elements from C to Sm were derived with NLTE approach for 18 of them. For 3 binaries (HD 133131AB, HD105615AB, HD80606-607) together with the previously studied 16 Cyg binary we do not obtain any abundance difference within the error limits which supports the negligible effect of giant planet formation on atmospheric chemistry of the host star. The marginal difference of 0.04 dex between the components of the co-moving pair HAT-P-4 + TYC 2569-744-1 may be caused by possible engulfment of the inner debris disk as a result of a Jupiter-like planet migration in HAT-P-4.

Sign up for the seminar