The Hot Neptune Initiative (HONEI) - II. TOI-5795 b: A hot super-Neptune orbiting a metal-poor star

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Volume 701 (September 2025)

A&A, 701 (2025) A230

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Table 1

Astrometric, spectroscopic, and photometric parameters for TOI-5795.

Parameter	Unit	Value	Source
Cross-identifications
TOI ID		5795	TOI cat.
TIC ID		151724385	TIC
TYC ID		5741-424-1	TYC
GSC ID		05741-00424	GSC
2MASS ID		J20192849-0732511	2MASS
Gaia DR1 ID		4216036345540368768	Gaia DR1
Gaia DR3 ID		4216036349838071424	Gaia DR3
Astrometric properties
α (J2000)	h:m:s	20 : 19 : 28.51	Gaia DR3
δ (J2010)	d:m:s	−07 : 32 : 51.57	Gaia DR3
π	mas	6.1900 ± 0.0213	Gaia DR3
µ_α	mas yr¹	12.8097 ± 0.0233	Gaia DR3
cos_δ	mas yr⁻¹	−29.7160 ± 0.0152	Gaia DR3
Photometric properties
B_T	mag	11.466 ± 0.135	Tycho-2
V_T	mag	10.708 ± 0.009	Tycho-2
g′	mag	11.107 ± 0.026	APASS Sloan
r′	mag	10.629 ± 0.026	APASS Sloan
i′	mag	10.512 ± 0.073	APASS Sloan
TESS	mag	10.187 ± 0.006	TIC v8.2
G	mag	10.6376 ± 0.000361	Gaia DR3
BP	mag	10.9813 ± 0.0007	Gaia DR3
RP	mag	10.1264 ± 0.0003	Gaia DR3
J	mag	9.557 ± 0.021	2MASS
H	mag	9.218 ± 0.021	2MASS
K	mag	9.168 ± 0.021	2MASS
W1 3.4 µm	mag	9.114 ± 0.022	AllWISE
W2 4.6 µm	mag	9.146 ± 0.020	AllWISE
W3 12 µm	mag	9.109 ± 0.033	AllWISE
Spectroscopic properties
Spectral type		G3 V	This work^(a)
υ sin i	km s⁻¹	1.9 ±1.0	This work
[Fe/H]	dex	−0.27 ± 0.07	This work
[C/H]	dex	−0.27 ± 0.05	This work
[S/H]	dex	−0.21 ± 0.07	This work
[O/H]	dex	−0.20 ± 0.10	This work
[Mg/H]	dex	−0.06 ± 0.08	This work
[Si/H]	dex	−0.14 ± 0.08	This work
Derived parameters
L_⋆	L_⊙	1.130 ± 0.043	This work
M_⋆	M_⊙	${0.901}_{- 0.037}^{+ 0.055}$ $0.901^{+0.055}_{-0.037}$	This work
R_⋆	R_⊙	1.082 ± 0.026	This work
log g_⋆	cgs	4.32 ± 0.13	This work
ρ_⋆	g cm⁻³	${1.008}_{- 0.073}^{+ 0.091}$ $1.008^{+0.091}_{-0.073}$	This work
log R′_HK	dex	−5.07 ± 0.02	This work^(b)
T_eff	K	5715 ± 55	This work
Age	Gyr	${10.2}_{- 3.3}^{+ 2.5}$ $10.2^{+2.5}_{-3.3}$	This work
A_V	mag	<0.094	This work
Distance	pc	161.5 ± 0.6	This work
γ_RV	ms⁻¹	−66962.3	This work

Notes. ^(a)The spectral type has been derived from the tables of Pecaut & Mamajek (2013) (version 2022) and using our T_eff value. ^(b)The log R′_HK has been derived using the ACTIN2 code (https://github.com/gomesdasilva/ACTIN2) v2.0 beta11 (Gomes da Silva et al. 2018) from the combined HARPS spectra. References: TESS Primary Mission TOI catalog (Guerrero et al. 2021); TIC (Stassun et al. 2018, 2019); Tycho (Høg et al. 2000); APASS Johnson (Henden et al. 2016); 2MASS (Skrutskie et al. 2006); Gaia DR3 (Gaia Collaboration 2023); AllWISE (Cutri et al. 2021).

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