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 2

Stellar parameters of HD 128717 and orbital solution for HD 128717 from Gaia DR3.

Parameter	HD 128717	Reference
Astrometric parameters
α (J2000)	14^h:36^m:21.3^s	(a)
δ (J2000)	+57°:33′ :38.4″	(a)
μ_α (mas yr⁻¹)	−82.125 ± 0.022	(a)
μ_δ (mas yr⁻¹)	67.259 ± 0.025	(a)
π (mas)	13.560 ± 0.022	(a)
RUWE	1.32	(a)
d	73.74 ± 0.12 pc	This work

Photometric parameters
B – V (mag)	0.627	(b)
B_T (mag)	8.981 ± 0.018	(b)
V_T (mag)	8.354 ± 0.012	(b)
G (mag)	8.2003 ± 0.0028	(a)
J (mag)	7.309 ± 0.021	(c)
H (mag)	7.078 ± 0.049	(c)
K (mag)	7.039 ± 0.029	(c)
W1 (mag)	6.954 ± 0.056	(d)
W2 (mag)	7.041 ± 0.020	(d)
W3 (mag)	7.049 ± 0.016	(d)
W4 (mag)	7.028 ± 0.068	(d)
A_V (mag)	<0.038	This work

Stellar parameters
T_eff (spec.) (K)	6210 ± 40	This work
log g (spec.) (cgs)	4.37 ± 0.13	This work
V_micro (km s⁻¹)	1.22 ± 0.05	This work
(Fe/H) (dex)	0.16 ± 0.08	This work
v sin i_⋆ (km s⁻¹)	6.1 ± 0.5	This work
EW_Li (mÅ)	67.0 ± 1.0	This work
log(N_Li)_{NLT E} (dex)	2.78 ± 0.02	This work
M_★ (M_⊙)	${1.212}_{- 0.068}^{+ 0.058}$ $Mathematical equation: $1.212_{ - 0.068}^{ + 0.058}$$	This work
R_★ (R_⊙)	1.248 ± 0.024	This work
ρ_★ (g cm⁻³)	${0.879}_{- 0.068}^{+ 0.065}$ $Mathematical equation: $0.879_{ - 0.068}^{ + 0.065}$$	This work
log g (track) (cgs)	${4.329}_{- 0.030}^{+ 0.025}$ $Mathematical equation: $4.329_{ - 0.030}^{ + 0.025}$$	This work
log L_*/L_⊙	${0.322}_{- 0.015}^{+ 0.014}$ $Mathematical equation: $0.322_{ - 0.015}^{ + 0.014}$$	This work
log R′_HK	−4.948 ± 0.020	This work
Age (Gyr)	1.4 ± 0.3	Appendix C

Notes. ^(a)Gaia Collaboration (2023b); ^(b)Høg et al. (2000); ^(c)Cutri et al. (2003); ^(d)Cutri et al. (2021).

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