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 2

Orbital and physical parameters of TOI-5795 b.

Parameter	Unit	Value
Light curve parameters
P_orb	day	6.1406325 ± 0.0000054
T₀	BJD_TDB	$2 459 {770.67397}_{- 0.00061}^{+ 0.00060}$ $2\,459\,770.67397_{-0.00061}^{+0.00060}$
T₁₄	hr	${3.407}_{- 0.026}^{+ 0.028}$ $3.407^{+0.028}_{-0.026}$
R_p/R_*		0.0477±0.0006
b		${0.29}_{- 0.14}^{+ 0.12}$ $0.29^{+0.12}_{-0.14}$
i	deg	${88.54}_{- 0.55}^{+ 0.68}$ $88.54^{+0.68}_{-0.55}$
a/R_*		${12.65}_{- 0.35}^{+ 0.34}$ $12.65^{+0.34}_{-0.35}$
Limb-darkening coefficients^(a)
q₁, TESS		${0.20}_{- 0.08}^{+ 0.15}$ $0.20^{+0.15}_{-0.08}$
q₂, TESS		${0.41}_{- 0.24}^{+ 0.33}$ $0.41^{+0.33}_{-0.24}$
q₁, B		${0.42}_{- 0.29}^{+ 0.36}$ $0.42^{+0.36}_{-0.29}$
q₂, B		${0.52}_{- 0.29}^{+ 0.31}$ $0.52^{+0.31}_{-0.29}$
q₁, LCO		${0.50}_{- 0.32}^{+ 0.33}$ $0.50^{+0.33}_{-0.32}$
q₂, LCO		${0.54}_{- 0.33}^{+ 0.32}$ $0.54^{+0.32}_{-0.33}$
RV parameters
K	m s⁻¹	${8.97}_{- 1.74}^{+ 1.51}$ $8.97^{+1.51}_{-1.74}$
$\sqrt{e} \sin ω$ $\sqrt{e}\sin\omega$		${0.197}_{- 0.105}^{+ 0.101}$ $0.197^{+0.101}_{-0.105}$
$\sqrt{e} \cos ω$ $\sqrt{e}\cos\omega$		${0.317}_{- 0.142}^{+ 0.107}$ $0.317^{+0.107}_{-0.142}$
e^(b)		<0.25
ω	deg	${31.67}_{- 17.83}^{+ 25.07}$ $31.67^{+25.07}_{-17.83}$
RV jitter HARPS	m s⁻¹	${3.75}_{- 1.08}^{+ 1.23}$ $3.75^{+1.23}_{-1.08}$
Derived
M_p	M_⊕	${23.66}_{- 4.61}^{+ 4.09}$ $23.66^{+4.09}_{-4.61}$
R_p	R_⊕	5.62 ±0.11
ρ_p	g cm⁻³	0.73 ± 0.13
log g_p	cgs	7.33 ± 1.29
a	au	0.064 ±0.002
$T_{e q}^{(c)}$ $T_{\rm eq}^{(c)}$	K	${1136.78}_{- 18.02}^{+ 18.89}$ $1136.78^{+18.89}_{-18.02}$
TSM^(d)		$103_{- 15}^{+ 25}$ $103^{+25}_{-15}$
GP coefficients
σ_GP		0.00160 ± 0.00014
ρ_GP		0.98 ± 0.09

Notes. The median values of the best-fit parameters for TOI-5795 b, along with their upper and lower 68% credibility intervals as uncertainties. These values, both fitted and derived, were obtained from the posterior distributions of the corresponding models. (a)q₁ ≡ (u₁ + u₂)² and q₂ ≡ 0.5 (u₁ + u₂)⁻¹, where u₁ and u₂ are the LD coefficients of the quadratic law (Kipping 2013). ^(b)The 95% (2σ) confidence upper limit on the eccentricity determined when √e cos ω and √e sin ω are allowed to vary in the fit. ^(c)This represents the equilibrium temperature assuming a Bond albedo of zero and an uniform redistribution of heat to the night side. ^(d)Transmission spectroscopy metric (TSM; Kempton et al. 2018).

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