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Binary stars provide an ideal laboratory for investigating the potentialeffects of planet formation on stellar composition. Assuming the stars formedin the same environment/from the same material, any compositional anomaliesbetween binary components might indicate differences in how material wassequestered in planets, or accreted by the star in the process of planetformation. We present here a study of the elemental abundance differencesbetween WASP-94AB, a pair of stars that each host a hot Jupiter exoplanet. Thetwo stars are very similar in spectral type (F8 and F9), and their ~2700 AUseparation suggests their protoplanetary disks were likely not influenced bystellar interactions, but WASP-94Ab's orbit -- misaligned with the host starspin axis and likely retrograde -- points towards a dynamically activeformation mechanism, perhaps different than that of WASP-94Bb, which is notmisaligned and has nearly circular orbit. Based on our high-quality spectra andstrictly relative abundance analysis, we detect a depletion of volatiles(~-0.02 dex, on average) and enhancement of refractories (~0.01 dex) inWASP-94A relative to B (standard errors are ~0.005 dex). This is different thanevery other published case of binary host star abundances, in which either nosignificant abundance differences are reported, or there is some degree ofenhancement in all elements, including volatiles. Several scenarios that mayexplain the abundance trend are discussed, but none can be definitivelyaccepted or rejected. Additional high-contrast imaging observations to searchfor companions that may be dynamically affecting the system, as well as alarger sample of binary host star studies, are needed to better understand thecurious abundance trends we observe in WASP-94AB.

The Curious Case of Elemental Abundance Differences in the Dual Hot Jupiter Hosts WASP-94AB