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Table 2
Parameters of the global model using exclusively ESPRESSO data.
| Parameter | Priors | GP | GP + 1 Signal | GP + 2 Signals | |
|---|---|---|---|---|---|
| Keplerian | |||||
| Period [days] |  (2, 20) |
11.219 |
11.194 |
||
| K [m s−1] |  (0, 5) |
1.51 |
1.47 |
||
| e |  (0, 1) |
0.105 |
0.082 |
||
| TP − 2 450 000 [d] |  (8525, 8535) |
8531.3 |
8531.5 |
||
| ω [rad] |  (− π, π) |
–0.44 |
–0.4 |
||
| Derived parameters | |||||
| Semi-major axis [AU] | 0.04864 |
0.04858 |
|||
| Mass sin (i)D00 [M⊕] | 1.27 |
1.23 |
|||
| Mass sin (i)M 15 [M⊕] | 1.29 |
1.25 |
|||
| Sinusoidal | |||||
| Period [days] |  (3, 10) |
5.152 |
|||
| K [m s−1] |  (0, 5) |
0.44 |
|||
| T0 − 2 450 000 [d] |  (8525, 8535) |
8530.69 |
|||
| Activity model | |||||
| BGP RV [(ms−1)2] |  (0.1, 50) |
5.1 |
5.0 |
4.0 |
|
| BGP FWHM [(m s−1)2] |  (0.1, 300) |
53 |
51 |
54 |
|
| PGP [d] |  (30, 300) |
51.8 |
47.7 |
46.9 |
|
| LGP [d] |  (30, 300) |
64 |
66 |
73 |
|
| log CGP |  (−10, 10) |
−300 |
−290 |
−300 |
|
| Noise | |||||
| JitE pre RV [m s−1] |  (0, 5) |
0.98 |
0.15 |
0.066 |
|
| JitE post RV [m s−1] |  (0, 5) |
0.92 |
0.073 |
0.069 |
|
| JitE pre FWHM [m s−1] |  (0, 5) |
0.063 |
0.073 |
0.070 |
|
| JitE post FWHM [m s−1] |  (0, 5) |
0.103 |
0.088 |
0.096 |
|
| Polynomial terms | |||||
| V0E pre RV [m s−1] |  (−10, 10) |
−0.9 |
−0.9 |
−0.9 |
|
| V0E post RV [m s−1] |  (−10, 10) |
2.2 |
1.9 |
2.1 |
|
| Lin RV [m s−1 −d ] |  (−0.1, 0.1) |
−0.005 |
−0.002 |
−0.005 |
|
| V0E pre FWHM [m s−1 ] |  (−10, 10) |
1.6 |
1.5 |
1.5 |
|
| V0E post FWHM [m s−1 ] |  (−10, 10) |
3.8 |
3.6 |
3.5 |
|
| Lin FWHM [m s−1 −d ] |  (−0.1, 0.1) |
−0.053 |
−0.054 |
−0.054 |
|
| Residuals | |||||
| RMS res [m s−1 ] | 0.82 | 0.27 | 0.26 | ||
| log Z | −259 | −219 | −212 |
Notes. Mass sin (i)D00 shows the minimum mass of Proxima b using the Delfosse et al. (2000) estimation for the mass of Proxima, and Mass sin (i)M 15 shows the minimum mass using the Mann et al. (2015) estimation.
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