White Papers



We have carried out a Markov-chain Monte Carlo analysis using a seven-planet, plane-parallel dynamical model compared with the transit time measurements through October 2019 of the seven transiting TRAPPIST-1 planets. Using draws from the posterior distribution of parameters from this MCMC analysis, we have forecast future transit times for each of the seven planets for each draw. We have computed the mean and standard deviation of each forecast time, and report these in a table of ephemerides. The columns contain: planet number (b=1,…,h=7); transit number (starting from 1 for the first transit), mean forecast time (JD – 2,450,000), and standard deviation of the forecast time.