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 3

Priors and best-fit parameters for the MCMC models tested in Sect. 4.

	RV 1-Keplerian		RV 1-Keplerian + trend Values
	Priors	Values
K_b (m s⁻¹)	𝒰(0,1000)	${321.9}_{- 3.4}^{+ 3.6}$ $Mathematical equation: $321.9_{ - 3.4}^{ + 3.6}$$	${321.2}_{- 3.6}^{+ 3.8}$ $Mathematical equation: $321.2_{ - 3.6}^{ + 3.8}$$
P_b (d)	𝒰(500,3000)	$2607_{- 79}^{+ 84}$ $Mathematical equation: $2607_{ - 79}^{ + 84}$$	$2423_{- 34}^{+ 365}$ $Mathematical equation: $2423_{ - 34}^{ + 365}$$
T_p,b (BJD–2450000)	𝒰(9700,10500)	$10 {158.73}_{- 0.60}^{+ 0.59}$ $Mathematical equation: $10\,158.73_{ - 0.60}^{ + 0.59}$$	$10 {158.83}_{- 0.61}^{+ 0.60}$ $Mathematical equation: $10\,158.83_{ - 0.61}^{ + 0.60}$$
$\sqrt{e_{b}} \cos ω_{b}$ $Mathematical equation: $\sqrt {{e_{\rm{b}}}} \cos {\omega _{\rm{b}}}$$	𝒰(–1,1)	$- {0.236}_{- 0.011}^{+ 0.011}$ $Mathematical equation: $ - 0.236_{ - 0.011}^{ + 0.011}$$	$- {0.232}_{- 0.012}^{+ 0.012}$ $Mathematical equation: $ - 0.232_{ - 0.012}^{ + 0.012}$$
$\sqrt{e_{b}} \sin ω_{b}$ $Mathematical equation: $\sqrt {{e_{\rm{b}}}} \sin {\omega _{\rm{b}}}$$	𝒰(–1,1)	$- {0.8660}_{- 0.0047}^{+ 0.0048}$ $Mathematical equation: $ - 0.8660_{ - 0.0047}^{ + 0.0048}$$	$- {0.861}_{- 0.009}^{+ 0.011}$ $Mathematical equation: $ - 0.861_{ - 0.009}^{ + 0.011}$$

M_b sin i (M_J)		${14.67}_{- 0.51}^{+ 0.50}$ $Mathematical equation: $14.67_{ - 0.51}^{ + 0.50}$$	${14.59}_{- 0.52}^{+ 0.52}$ $Mathematical equation: $14.59_{ - 0.52}^{ + 0.52}$$
a_b (AU)		${3.95}_{0.10}^{+ 0.11}$ $Mathematical equation: $3.95_{0.10}^{ + 0.11}$$	${3.76}_{- 0.35}^{+ 0.37}$ $Mathematical equation: $3.76_{ - 0.35}^{ + 0.37}$$
e_b		${0.8061}_{- 0.0065}^{+ 0.0064}$ $Mathematical equation: $0.8061_{ - 0.0065}^{ + 0.0064}$$	${0.796}_{- 0.020}^{+ 0.018}$ $Mathematical equation: $0.796_{ - 0.020}^{ + 0.018}$$
ω_⋆,b (rad)		$- {1.837}_{- 0.013}^{+ 0.013}$ $Mathematical equation: $ - 1.837_{ - 0.013}^{ + 0.013}$$	$- {1.834}_{- 0.013}^{+ 0.013}$ $Mathematical equation: $ - 1.834_{ - 0.013}^{ + 0.013}$$

γ_HARPS-N (m s⁻¹)	𝒰(–50.0,250.0)	${238.14}_{- 0.99}^{+ 1.01}$ $Mathematical equation: $238.14_{ - 0.99}^{ + 1.01}$$	${237.2}_{- 1.9}^{+ 1.9}$ $Mathematical equation: $237.2_{ - 1.9}^{ + 1.9}$$
σ_jit,HARPS-N (m s⁻¹)	𝒰(0,100)	${5.22}_{- 0.39}^{0.44}$ $Mathematical equation: $5.22_{ - 0.39}^{0.44}$$	${5.22}_{- 0.38}^{+ 0.44}$ $Mathematical equation: $5.22_{ - 0.38}^{ + 0.44}$$
d (m s⁻¹ d⁻¹)	𝒰(–0.05,0.05)	–	${0.010}_{- 0.019}^{+ 0.024}$ $Mathematical equation: $0.010_{ - 0.019}^{ + 0.024}$$

BIC		688	693

Notes. The best RV model is highlighted in bold.

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