# Cubic spline interpolation in light curve of pulsating stars

Why is cubic spline interpolation used to analyze light curve of pulsating stars? Is there any scientific justification of such usages? One example of using the cubic spline interpolation is here, section 4.

There are literally innumerable scientists and papers that base all of their results on what the cubic spline gives them, in fields from photometry as you've linked, to temperatures derived from Ly$\alpha$ absorption profiles as seen here.