Extended Data Table 2 Additional fit parameters and fit results

From: A candidate super-Earth planet orbiting near the snow line of Barnard’s star

  1. The individual zero points γ and jitter terms are optimized for each dataset by maximizing the likelihood function. The model also included a parameter representing a global linear radial velocity trend over time, for which the optimization process yielded a best-fitting value of +0.33 ± 0.07 m s−1 yr−1. The original individual datasets were previously shifted to have null relative offsets in the overlapping regions (see Extended Data Table 3) and referred to the zero-point level of the Keck/HIRES dataset. This implies that the optimized γ parameters in the table are not totally arbitrary but expected to be relatively similar. The parameters and their uncertainties are determined by calculating the median values and 68% credibility intervals of the distribution that results from the MCMC run.
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