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Table 5

Parameter posteriors for the HD 1461 system.

Orbital parameters Planet b Planet c Magnetic cycle

Orbital period, P [days] 5.77152 ± 0.00045 13.5052 ± 0.0029 3503 ± 80
RV amplitude, K [m s-1] 2.28 ± 0.15 1.49 ± 0.17 1.51 ± 0.26
Eccentricity, e <0.131; <0.172 <0.228; <0.305
Argument of periastron, ω [deg] 294 ± 15
e1/2cos(ω) 0.131 ± 0.09
e1/2sin(ω) − 0.298 ± 0.068
Mean longitude at epoch, L0 [deg] 271.6 ± 4.1 317.9 ± 6.6 148.6 ± 6.7
Systemic velocity, V0 [km s-1] − 10.05960 ± 1.7 × 10-4
Semi-major axis of relative orbit, a [AU] 0.0634 ± 0.0022 0.1117 ± 0.0039
Minimum mass, Msini [M] 6.44 ± 0.61 5.59 ± 0.73
Noise model

Additional noise at = –5, σJ | -5.0 [m s-1]
Slope, αJ [ m s-1/dex] 25.5 ± 6.4
Additional noise at [m s-1] 1.67 ± 0.09
rms(O−C) [m s-1] 2.260 ± 0.067

Notes. The epoch is BJD = 2 455 155.3854 for planets b and c and BJD = 2 455 195.8367 for the magnetic cycle.

(•)

MCMC jump parameter.

(†)

Eccentricity does not differ significantly from zero; the 95% and 99% upper limits are reported. The argument of periastron ω is therefore unconstrained.

(‡)

The additional (stellar) noise for measurement i is .

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