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Although several S-type and P-type planets in binary systems were discoveredin past years, S-type planets have not yet been found in close binaries with anorbital separation not more than 5 au. Recent studies suggest that S-typeplanets in close binaries may be detected through high-accuracy observations.However, nowadays planet formation theories imply that it is difficult forS-type planets in close binaries systems to form in situ. In this work, weextensively perform numerical simulations to explore scenarios of planet-planetscattering among circumbinary planets and subsequent tidal capture in variousbinary configurations, to examine whether the mechanism can play a part inproducing such kind of planets. Our results show that this mechanism is robust.The maximum capture probability is $\sim 10\%$, which can be comparable to thetidal capture probability of hot Jupiters in single star systems. The captureprobability is related to binary configurations, where a smaller eccentricityor a low mass ratio of the binary will lead to a larger probability of capture,and vice versa. Furthermore, we find that S-type planets with retrograde orbitscan be naturally produced via capture process. These planets on retrogradeorbits can help us distinguish in situ formation and post-capture origin forS-type planet in close binaries systems. The forthcoming missions (PLATO) willprovide the opportunity and feasibility to detect such planets. Our workprovides several suggestions for selecting target binaries in search for S-typeplanets in the near future.

Formation of S-type planets in close binaries: scattering induced tidal capture of circumbinary planets