The GAPS Programme at TNG - LXXIII. Confirmation of the hot sub-Neptune TOI-4602 b (HD 25295 b), a key target for future atmospheric characterization

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Volume 709 (May 2026)

A&A, 709 (2026) A270

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Table 1

Stellar parameters of TOI-4602.

Parameter (unit)	Value	Source
Identifiers
TOI	4602	TOI catalog
TIC	467 651 916	TIC
HIP	18 841	HIP
HD	25 295	HD
TYC	2357-595-1	Tycho
2MASS	J04022420+3119501	2MASS
Gaia	169256041140206848	Gaia DR3
Astrometric properties
α (J2000.0)	04:02:24.219	Gaia DR3
δ (J2000.0)	+31:19:50.39	Gaia DR3
π (mas)	15.921 ± 0.028	Gaia DR3
µ_α cos δ (mas yr^–1)	–115.397 ± 0.033	Gaia DR3
µ_δ (mas yr^–1)	–192.412 ± 0.023	Gaia DR3
Distance (pc)	62.64 ± 0.11	Gaia DR3
Photometric properties
B_T	9.028 ± 0.012	Tycho-2
V_T	8.392 ± 0.010	Tycho-2
(B – V)₀	0.591	Tycho-2
G_BP	8.4709 ± 0.0028	Gaia DR3
G	8.1839 ± 0.0028	Gaia DR3
G_RP	7.7227 ± 0.0038	Gaia DR3
J	7.196 ± 0.020	2MASS
H	6.934 ± 0.031	2MASS
K_S	6.883 ± 0.027	2MASS
W1	6.868 ± 0.070	AllWISE
W2	6.859 ± 0.020	AllWISE
W3	6.904 ± 0.017	AllWISE
W4	6.878 ± 0.082	AllWISE
A_V	<0.12	This work
Stellar parameters
Spectral type	G5	Tycho-2
L_⋆ (L_⊙)	${1.3}_{- 0.2}^{+ 0.3}$ $Mathematical equation: $1.3_{ - 0.2}^{ + 0.3}$$	This work
M_⋆ (M_⊙)	0.90 ± 0.02	This work
R_⋆ (R_⊙)	${1.08}_{- 0.07}^{+ 0.10}$ $Mathematical equation: $1.08_{ - 0.07}^{ + 0.10}$$	This work
T_eff (K)	5966 ± 50	This work
v sin i (km s⁻¹)	2.2±0.7	This work
log g_⋆ (cgs)	4.34 ± 0.10	This work
ξ (km s⁻¹)	1.25 ± 0.08	This work
[Fe/H] (dex)	–0.26 ± 0.03	This work
A(Li)_NLTE	2.26±0.04	This paper
ρ_⋆ (ρ_⊙)	${0.71}_{- 0.16}^{+ 0.15}$ $Mathematical equation: $0.71_{ - 0.16}^{ + 0.15}$$	from PARAM
$\log R_{H K}^{'} (dex)$ $Mathematical equation: $\log R_{HK}^'{\rm{(dex)}}$$	-4.955 ± 0.015	This work
Age (Gyr)	${3.2}_{- 2.4}^{+ 4.1}$ $Mathematical equation: $3.2_{ - 2.4}^{ + 4.1}$$	from EW_Li
Age (Gyr)	∼ 4.5	from logNLi_NLTE
Age (Gyr)	${8.7}_{- 1.2}^{+ 1.3}$ $Mathematical equation: $8.7_{ - 1.2}^{ + 1.3}$$	from PARAM
U^(a) (km s⁻¹)	58.15 ± 0.02	This work
V^(a) (km s⁻¹)	–31.41 ± 0.04	This work
W^(a) (km s⁻¹)	–49.48 ± 0.11	This work

Notes. TESS Primary Mission TOI catalogue (Guerrero et al. 2021); TIC (Stassun et al. 2018, 2019); HIP (Perryman et al. 1997); Tycho-2 (Høg et al. 2000); 2MASS (Skrutskie et al. 2006); Gaia DR3 (Gaia Collaboration 2023); AllWISE (Cutri et al. 2021). (a) Galactic velocity components, where U is positive towards the Galactic centre, V in the direction of the Galactic rotation, and W towards the North Galactic Pole.

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