The GAPS programme at TNG - LXX. HD128717 B/Gaia-6 B: A long-period eccentric low-mass brown dwarf from astrometry and radial velocities

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Volume 707 (March 2026)

A&A, 707 (2026) A67

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Table B.1

Priors and best-fit parameters for the tested Gaia- constrained MCMC model.

	Priors	Values
K_b [m s⁻¹]	𝒰(0,1000)	${322.2}_{- 3.5}^{+ 3.7}$ $Mathematical equation: $322.2_{ - 3.5}^{ + 3.7}$$
P_b [d]	𝒩(1090, 310)	$2513_{- 69}^{+ 72}$ $Mathematical equation: $2513_{ - 69}^{ + 72}$$
T_p,b [BJD–2450000]	𝒩(10490, 290)	${10159.07}_{- 0.60}^{+ 0.58}$ $Mathematical equation: $10159.07_{ - 0.60}^{ + 0.58}$$
$\sqrt{e_{b}} \cos ω_{b}$ $Mathematical equation: $\sqrt {{e_{\rm{b}}}} \cos {\omega _{\rm{b}}}$$	𝒩(0.28, 0.32)	$- {0.229}_{- 0.011}^{+ 0.011}$ $Mathematical equation: $ - 0.229_{ - 0.011}^{ + 0.011}$$
$\sqrt{e_{b}} \sin ω_{b}$ $Mathematical equation: $\sqrt {{e_{\rm{b}}}} \sin {\omega _{\rm{b}}}$$	𝒩(−0.22, 0.41)	$- {0.8646}_{- 0.0048}^{+ 0.0048}$ $Mathematical equation: $ - 0.8646_{ - 0.0048}^{ + 0.0048}$$

M_b sin i [M_J]		${14.70}_{- 0.51}^{+ 0.50}$ $Mathematical equation: $14.70_{ - 0.51}^{ + 0.50}$$
a_b [AU]		${3.860}_{- 0.097}^{+ 0.099}$ $Mathematical equation: $3.860_{ - 0.097}^{ + 0.099}$$
e_b		${0.8002}_{- 0.0065}^{+ 0.0063}$ $Mathematical equation: $0.8002_{ - 0.0065}^{ + 0.0063}$$
ω_⋆,b [rad]		$- {1.830}_{- 0.013}^{+ 0.013}$ $Mathematical equation: $ - 1.830_{ - 0.013}^{ + 0.013}$$

γ_HARPS-N [m s⁻¹]	𝒰(−50.0,250.0)	${237.49}_{- 0.95}^{+ 0.96}$ $Mathematical equation: $237.49_{ - 0.95}^{ + 0.96}$$
σ_jit,HARPS-N [m s⁻¹]	𝒰(0,100)	5.25+0.44_−0.39

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