Simple supergravity model of inflation constrained with Planck 2018 data

We study a model of inflation based on N=1 supergravity essentially depending on one effective parameter. Under a field transformation we show that this model turns out to be equivalent to a previously studied supergravity model known to be ruled out with the original choice of the parameter. Such parameter measures the slope of the potential at observable scales. Through a Bayesian parameter estimation, it is shown how this model is compatible with recent cosmic microwave background temperature measurements by Planck 2018 giving rise to a simple, viable, single field model of inflation. The tensor to scalar ratio constraint is found to be r0.002