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Table I.1

Priors for the joint modeling of RV and Hipparcos/Gaia astrometric data.

Parameter prior description
Stellar parameters:
M* (M) 𝒩 (1.2, 0.06) Stellar mass
Parallax (mas) 𝒩 (30.025,0.023) Stellar parallax
σ* (m s−1) 𝒰(0, 10) Stellar jitter
Planet parameters
a (au) 𝒰(1,100) Semi-major axis of HD88986 c
e 𝒰(0, 0.99) Eccentricity
ω (º) 𝒰(0, 360) Argument of periastron
I (º) sin(0,180) Orbital inclinaison
Ω (º) 𝒰(0, 360) Longitude of ascending node
Mc (MJup) 𝒰(1,500) Mass of HD88986 c
SOPHIE instrumental Parameters:
muE LODIE (m s−1) 𝒰(28000,30000) ELODIE offset
muS OPHIE (m s−1) 𝒰(28000,30000) SOPHIE offset
muS OPHIE+ (m s−1) 𝒰(28000,30000) SOPHIE+ offset
muHIRES (m s−1) 𝒰(−1000,1000) HIRES offset
muHIRES+ (m s−1) 𝒰(−1000,1000) HIRES+ offset

Notes. The prior labels of 𝒩, 𝒰, sin indicate normal, uniform, and sinusoidal distributions.

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