the whole [*Kepler*]{} dataset and 35 transits of KOI-872b, the mass of the transiting candidate can already be constrained from TTVs to give $M_b=0.88_{-0.34}^{+0.37}$ $M_{\rm J}$ (Saad-Olivera et al. 2017). This is possible because the TTV signal starts picking up the non-linear terms in the mutual interaction of the two planets.

[**From David K’s email on 1/10/2012:**]{}

I want to just update on the progress of the real project here. I have adapted multinest to work on “real” data now, it took a hellish day of coding but I think it is now working. I am about to start a final test on HCV-439 to see if I recover the same TTVs as before. If it passes this test, then I will begin detrending the new [*Kepler*]{} data for this system.

Once I have detrended the data, I will begin fits on all 14 transits. This could take some time, week or more. However, the nice thing with multinest is that one rarely has to re-execute the fits.

Multinest is a multimodal nested sampling algorithm that was developed by Farhan Ferroz (Ferroz et al. 2009). David K initially used it to obtain parameters of individual transits from the [*Kepler*]{} photometry. 