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Table A.3

Priors used for the RVs fits to the RVs of GJ 3988.

Parameter Prior Unit Description
Planet parameters
Pb 𝒰(0.0, 20.0) d Period
Kb 𝒰(0.0, 50.0) m s−1 RV semi-amplitude
t0,b (BJD) 𝒰(2457508.0, 2457512.0) d Time of periastron passage
𝒰(−1,1)/fixed(0) Parameterisation for e and ω.
𝒰(−1,1)/fixed(0) Parameterisation for e and ω.
Pc 𝒰(110, 120) d Period
Kc 𝒰(0.0, 50.0) m s−1 RV semi-amplitude
t0,b (BJD) 𝒰(2457500, 2457700) d Time of periastron passage
𝒰(−1,1)/fixed(0) Parameterisation for e and ω.
𝒰(−1,1)/fixed(0) Parameterisation for e and ω.
GP parameters
PGP, rv (d) 𝒩(116.0, 10.0) d Period
σGP, CARM-VIS (m s−1) 𝒰(0.0, 50.0) m s−1 Standard deviation
σgp, ird (m s−1) 𝒰(0.0, 50.0) m s−1 Standard deviation
fGP, rv 𝒰(0.0, 1.0) Fractional amplitude of secondary mode
Q0,GP, rv 𝒥(0.1, 1 × 105) Quality factor of secondary mode
dQGP, rv 𝒥(0.1, 1 × 105) Difference in quality factor between primary and secondary mode
Instrument parameters
γCARM-VIS 𝒰(-10, 10) m s−1 RV zero point
σCARM-VIS 𝒰(0.0, 30) m s−1 A jitter added in quadrature
γIRD 𝒰(-10, 10) m s−1 RV zero point
σIRD 𝒰(0.0, 30) m s−1 A jitter added in quadrature

Notes. The prior labels 𝒰, 𝒥, and 𝒩 represent uniform, log-uniform, and normal distributions, respectively.

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