Sinusoidal Lightcurve

Basic implementation of a sinusoidal light curve. This provides a simple example implementation where the apparent magnitude of the object (that is, the magnitude after all geometric effects have been taken into account), has a sinusoidal term added to it. To use this function, in the Sorcha complex parameters file the user must provide a light curve amplitude (LCA), corresponding to half the peak-to-peak amplitude for the magnitude changes, a period Period, and a reference time Time0 where the light curve is at 0 - if these are not provided, the software will produce an error message. Despite being simple, that implementation shows all the class methods that need to be implemented for a custom light curve function. We have Example Jupyter Notebooks demonstrating the SinusoidalLightCurve class built into ``Sorcha add-ons``package, To use this prescription, the lc_model variable should be set to sinusoidal in the Sorcha configuration file.