Table A.1
Parameter prior distributions.
| Stellar parameters | Prior | |
|---|---|---|
| Systemic radial velocity, γ0(a) | (km s−1) | U(−84.79, −84.59) |
| Parallax, π(a) | (mas) | N(392.64, 0.67) |
| Proper motion in RA, μα(a) | (mas yr−1) | N(−580.27, 0.62) |
| Proper motion in Dec, μδ(a) | (mas yr−1) | N(−4765.85, 0.64) |
| Orbital parameters | ||
| Orbital period, P | (days) | J(1, 600) |
| RV amplitude, K | (m s−1) | mJ(1, 10) |
 |
– | U(−1, 1) |
 |
– | U(−1, 1) |
 |
– | U(0, 1) |
| Mean longitude at epoch, λ0 | (deg) | U(−180, 180) |
| Drift parameters | ||
| Constant acceleration, γ1 | (m s−1 yr−1) | U(−10, 10) |
| Linear acceleration, γ2 | (m2s−2 yr−2) | U(−10, 10) |
| Noise model | ||
| Covariance amplitude, A | (m s−1) | mJ(1, 10) |
| Log-characteristic timesale, log10τ | (d) | U(−1, 5) |
| Extra white-noise amplitude, σJ | (m s−1) | mJ(1, 10) |
| Zero-point proportionaly constant, ac | – | U(−10, 10) |
Notes. (a) At the epoch of HIPPARCOS data, J1991.25, JD = 2 448 349.0625. U(xmin;xmax): uniform distribution between xmin and xmax. J(xmin ;xmax): Jeffreys (log-flat) distribution between xmin and xmax. mJ(x0 ; xmax): modified Jeffreys (log-flat) distribution, between 0 and xmax, 
N(μ; σ): normal distribution with mean μ and standard deviation σ.
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