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After Planck 2013, a broad class of inflationary models called\alpha-attractors was developed which has universal observational predictions.For small values of the parameter \alpha, the models have good consistency withthe recent CMB data. In this work, we first calculate analytically (and verifynumerically) the predictions of these models for spectral index, n_s andtensor-to-scalar ratio, r and then using BICEP2/Keck 2015 data we imposeconstraints on \alpha-attractors. Then, we study the reheating in\alpha-attractors. The reheating temperature, T_{re} and the number of e-foldsduring reheating, N_{re} are calculated as functions of n_s. Using theseresults, we determine the range of free parameter \alpha for two clasees of\alpha-attractors which satisfy the constraints of recent CMB data.

CMB and reheating constraints to \alpha-attractor inflationary models