The Hot-Neptune Initiative (HONEI) - I. Two hot sub-Neptunes on a close-in eccentric orbit (TOI-5800 b) and a farther-out circular orbit (TOI-5817 b)

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Volume 701 (September 2025)

A&A, 701 (2025) A79

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Table 1

Stellar parameters of TOI-5800 and TOI-5817.

	Unit	Value	Value	Source
TOI		5800	5817	TOI catalogue
TIC		151759246	418604868	TIC
HD		193396	204660	HD
HIP		...	106097	HIP
Tycho-2		5174-53-1	1676-735-1	Tycho-2
2MASS		J20201568-0724422	J21293069+2128296	2MASS
Gaia		4216059714460162944	1790807028049001600	Gaia DR3
α (J2016.0)	h	20:20:15.73	21:29:30.66	Gaia DR3
δ (J2016.0)	deg	−07:24:42.95	+21:28:28.25	Gaia DR3
π	mas	23.394 ± 0.019	12.447 ± 0.022	Gaia DR3
μ_α cos δ	mas/yr	51.531 ± 0.018	−10.391 ± 0.023	Gaia DR3
μ_δ	mas/yr	−52.722 ± 0.015	−89.868 ± 0.013	Gaia DR3
d	pc	42.745 ± 0.033	80.34 ± 0.14	This work¹
B_T	mag	10.745 ± 0.048	9.404 ± 0.018	Tycho-2
B	mag	10.460 ± 0.030	−	APASS
V_T	mag	9.658 ± 0.028	8.713 ± 0.013	Tycho-2
G	mag	9.21824 ± 0.00017	8.48343 ± 0.00024	Gaia DR3
J	mag	7.771 ± 0.021	7.420 ± 0.023	2MASS
H	mag	7.284 ± 0.026	7.190 ± 0.038	2MASS
K_S	mag	7.191 ± 0.020	7.084 ± 0.023	2MASS
W1	mag	7.111 ± 0.044	6.975 ± 0.054	AllWISE
W2	mag	7.188 ± 0.021	7.069 ± 0.020	AllWISE
W3	mag	7.156 ± 0.017	7.045 ± 0.017	AllWISE
W4	mag	7.095 ± 0.115	7.133 ± 0.106	AllWISE
A_V	mag	<0.087	<0.099	This work¹
Spectral type		K3 V	G2 IV-V	This work³
L_⋆	L_⊙	0.309 ± 0.015	${2.05}_{- 0.10}^{+ 0.12}$ $\[2.05_{-0.10}^{+0.12}\]$	This work¹
M_⋆	M_⊙	${0.778}_{- 0.032}^{+ 0.037}$ $\[0.778_{-0.032}^{+0.037}\]$	${0.970}_{- 0.055}^{+ 0.072}$ $\[0.970_{-0.055}^{+0.072}\]$	This work¹
R_⋆	R_⊙	0.773 ± 0.023	${1.427}_{- 0.040}^{+ 0.043}$ $\[1.427_{-0.040}^{+0.043}\]$	This work¹
T_eff	K	4850 ± 78	5770 ± 50	This work²
v sin i_⋆	km s⁻¹	1.3 ± 0.5	1.2 ± 0.7	This work⁴
log g_⋆	cgs	4.56 ± 0.03	4.12 ± 0.04	This work¹
log g_⋆	cgs	4.48 ± 0.08	4.15 ± 0.05	This work²
ξ	km s⁻¹	0.65 ± 0.10	1.05 ± 0.08	This work²
[Fe/H]	dex	−0.04 ± 0.13	−0.24 ± 0.09	This work²
[Mg/H]	dex	0.09 ± 0.08	−0.10 ± 0.08	This work²
[Si/H]	dex	0.08 ± 0.07	−0.13 ± 0.07	This work²
ρ_⋆	g cm⁻³	2.41 ± 0.21	0.47 ± 0.05	This work¹
log $R_{H K}^{'}$ $\[R_{\mathrm{HK}}^{\prime}\]$	dex	−4.885 ± 0.007	−4.950 ± 0.004	This work²
Age	Gyr	${8.1}_{- 4.8}^{+ 4.0}$ $\[8.1_{-4.8}^{+4.0}\]$	${9.7}_{- 2.5}^{+ 2.3}$ $\[9.7_{-2.5}^{+2.3}\]$	This work¹

Notes. TESS Primary Mission TOI catalogue (Guerrero et al. 2021); TIC (Stassun et al. 2018; Stassun et al. 2019); HD (Cannon & Pickering 1918–1924); HIP (Perryman et al. 1997); Gaia DR3 (Gaia Collaboration 2023); Tycho-2 (Høg et al. 2000); APASS (Henden et al. 2016); 2MASS (Cutri et al. 2003); AllWISE (Cutri et al. 2021). ¹From the EXOFASTv2 modelling (this work). ²From the HARPS-N spectral analysis (this work). ³According to the Pecaut & Mamajek (2013) calibration [v. 2022]. ⁴Refer to Naponiello et al. (2025) for the details on its derivation.

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