Timescales of orbital circularization for K2-265 b. The red squares (resp. black dots) are the data obtained from the numerical integrations employing the secular code for the initially synchronous (resp. fast-rotating) planet case. The red (resp. black) dashed curves are the corresponding least-square fittings of the results coming from the secular code experiments. The green dashed vertical line on the left (resp. right) is the lower value of the viscosity for which we can reproduce the planet’s current range of eccentricity values for the initially synchronous (resp. fast-rotating) planet case, with τ = τ_circ = 6.7 Gyr.