The GAPS Programme at TNG - LXVII. Detection of water and preliminary characterisation of the atmospheres of the two hot Jupiters: KELT-8 b and KELT-23 Ab

Home

All issues

Volume 695 (March 2025)

A&A, 695 (2025) A107

Full HTML

Open Access

Table 1

Main physical and orbital parameters of the KELT-8 and KELT-23 A systems.

Parameter (^a)	KELT-8	KELT-23 A	References (^b)
Stellar parameters
Spectral Class	G2V	G2V	1, 2
B_T	11.713 ± 0.057	11.029 ± 0.049	3, 3
V_T	10.925 ± 0.048	10.376 ± 0.039	3, 3
J	9.586 ± 0.026	9.208 ± 0.032	4, 4
H	9.269 ± 0.032	≥8.951	4, 4
K	9.177 ± 0.021	≥8.904	4, 4
W1	8.981 ± 0.021	8.754 ± 0.022	5, 5
W2	8.983 ± 0.019	8.789 ± 0.020	5, 5
W3	8.928 ± 0.028	8.766 ± 0.022	5, 5
W4	8.533 ± 0.339	8.564 ± 0.202	5, 5
M_⋆ (M_⊙)	${1.131}_{- 0.079}^{+ 0.084}$ $1.131_{ - 0.079}^{ + 0.084}$	${0.944}_{- 0.054}^{+ 0.060}$ $0.944_{ - 0.054}^{ + 0.060}$	6, 2
R_⋆ (R_⊙)	1.391 ± 0.025	0.996 ± 0.015	6, 2
T_eff (K)	5 742 ± 44	5899±49	6, 2
[Fe/H] (dex)	0.26 ± 0.10	$- {0.105}_{- 0.077}^{+ 0.078}$ $- 0.105_{ - 0.077}^{ + 0.078}$	6, 2
log₁₀(g) (log₁₀, cgs)	4.19 ± 0.08	${4.417}_{- 0.025}^{+ 0.026}$ $4.417_{ - 0.025}^{ + 0.026}$	6, 2
V_sys (km s⁻¹)	−34.51 ± 0.20	−14.99 ± 0.30	7, 7
Parallax (mas)	5.074 ± 0.011	7.871 ± 0.013	7, 7
Distance (pc)	${197.10}_{- 0.44}^{+ 0.42}$ $197.10_{ - 0.44}^{ + 0.42}$	127.04 ± 0.21	7, 7
Age (Gyr)	${6.4}_{- 2.0}^{+ 2.9}$ $6.4_{ - 2.0}^{ + 2.9}$	${6.3}_{- 3.2}^{+ 3.5}$ $6.3_{ - 3.2}^{ + 3.5}$	6, 2
Planetary parameters		${0.938}_{- 0.044}^{+ 0.048}$ $0.938_{ - 0.044}^{ + 0.048}$
M_p (M_J)	0.83 ± 0.12	1.323 ± 0.025	6, 2
R_p (RJ)	1.586 ± 0.046	$298_{- 14}^{+ 15}$ $298_{ - 14}^{ + 15}$	6, 2
M_p (M_⊕)	264 ± 38	14.83 ± 0.28	6, 2
R_p (R_⊕ )	17.40 ± 0.50	${0.503}_{- 0.036}^{+ 0.039}$ $0.503_{ - 0.036}^{ + 0.039}$	6, 2
ρ_p (g cm⁻³)	0.276 ± 0.047	1 561 ± 20	6, 2
T_eq (K)	$1675_{- 55}^{+ 61}$ $1675_{ - 55}^{ + 61}$	2.25528745 ± 0.00000018	1, 2
P_orb (days)	3.24408156 ± 0.0000010	2 458 918.461247 ± 0.000021	8, 8
T₀ (BJD_TDB)	2 457 986.46737 ± 0.00026	${82.65}_{- 1.00}^{+ 0.81}$ $82.65_{ - 1.00}^{ + 0.81}$	8, 8
i (deg)	${85.37}_{- 0.30}^{+ 0.31}$ $85.37_{ - 0.30}^{ + 0.31}$	≤0.05	1, 2
E	≤0.047	${0.03302}_{- 0.00064}^{+ 0.00068}$ $0.03302_{ - 0.00064}^{ + 0.00068}$	9, 2
a (au)	0.0382 ± 0.0025		6, 2
K_p (km s⁻¹)	149 ± 26	159 ± 14	6, 2

Notes. ^(a) The symbols of the parameters listed in the table have the following meanings: B_T, V_T – apparent magnitudes in the Tycho photometric bands; J, H, K – apparent magnitudes in the 2MASS photometric bands; W1, W2, W3, W4 – apparent magnitudes in the WISE photometric bands; M_⋆ – stellar mass; R_⋆ – stellar radius; T_eff - stellar effective temperature; [Fe/H] – stellar iron abundance; log₁₀(g) – logarithm of surface stellar gravity; V_sys – systemic radial velocity; M_p – planetary mass; R_p – planetary radius; ρ_p – planetary mean density; T_eq – planetary equilibrium temperature; P_orb – orbital period; T₀ – transit epoch; i – orbital inclination; e - orbital eccentricity; a – orbital semi-major axis; K_p – planetary radial-velocity semi-amplitude. ^(b)The left reference numbers are for the parameters of the KELT-8 system, and the right ones for those of the KELT- 23 A system. The references of the values in the table are: 1. Fulton et al. (2015); 2. Johns et al. (2019); 3. Høg et al. (2000); 4. Cutri et al. (2003); 5. Cutri et al. (2013); 6. This work and Baratella et al. (in prep.); 7. Gaia Collaboration (2023); 8. Kokori et al. (2023); 9. Bonomo et al. (2017).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.