This arXival (accepted in Icarus) proposes to offer insights into the relative support for a periodic (seasonal) signal in Martian methane levels with respect to an aperiodic alternative. The method adopted is to fit various flavours (kernels) of a Gaussian process regression and examine the posteriors. With just 10 datapoints this is a very silly exercise since posterior coverage is nonsense and the sensitivity to prior choice incredibly high; neither of which are considered despite input from a professor who regularly uses and advocates GPs plus two referees.
(*) An aside: I once tried to convince the students of this professor that a wider class of stochastic process models could be considered beyond GPs (facilitated by sequential Monte Carlo methods for posterior sampling), but their response was that since a GP can fit anything it was all they needed for any job. I needn’t go on.