Table 1 Results of the GP regression analysis applied to RVs, including two circular orbital equations, and to ASAS photometry.

Jump parameterPriorBest-fit value
GP hyperparameters
  h (m s−1)U(0,4)1.70.2+0.3
  λ (days)U(0,1000)398279+122
  wU(0,1)0.300.05+0.06
  θ (days)U(80,95)87.80.8+0.6
Planet parameters
  Kb (m s−1)U(0,3)1.2 ± 0.1
  Pb (days)U(10.5,12)11.185 ± 0.001
  Tb, conj (BJD-2,450,000)U(7895,7910)7897.90.2+0.3
  eb0 (fixed)
  Kc (m s−1)U(0,3)1.2 ± 0.4
  Pc (days)U(1600,2200)190082+96
  Tc, conj (BJD-2,450,000)U(5000,7300)5892102+101
  ec0 (fixed)
Other parameters
  dVr/dt (m s−1 day−1)U(−0.001,+0.001)0.0002 ± 0.0003
  σjit, HARPSpre − 2016 (m s−1)U(0,3)1.0 ± 0.3
  σjit, HARPSpost − 2016 (m s−1)U(0,3)0.50.3+0.2
  σjit, UVES (m s−1)U(0,3)1.0 ± 0.2
  γHARPSpre − 2016 (m s−1)U(−5,5)0.7 ± 0.5
  γHARPSpost − 2016 (m s−1)U(−5,5)−1.2 ± 1.1
  γUVES (m s−1)U(−5,5)0.4 ± 0.6
Derived parameters
  Minimum mass, mb sin ib (M)1.0 ± 0.1
  Orbital semi-major axis, ab (AU)0.048 ± 0.002
  Equilibrium temperature, Teq, b (K]21699+91
  Minimum mass, mc sin ic (M)5.8 ± 1.9
  Orbital semi-major axis, ac (AU)1.48 ± 0.08
  Equilibrium temperature, Teq, c (K)3918+16
  Minimum astrometric semi-amplitude of Proxima c,
α sin ic (μas)
16650+54
  Maximum angular separation of Proxima c (arc sec)1.14 ± 0.06
  Bayesian evidence ln Z−580.51 ± 0.06
Photometry (ASAS-3–ASAS-4) GP hyperparameters
  λphoto (days)U(0,10,000)367.677.3+94.6
  wphotoU(0,10)0.740.12+0.17
  θphoto (days)U(1,100)85.10.7+1.0