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 2

Final parameters from the global fits.

Parameters	TOI-5800 b	TOI-5817 b
Transit and orbital
K (m s⁻¹)	${5.40}_{- 1.05}^{+ 1.00}$ $\[5.40_{-1.05}^{+1.00}\]$	2.69 ± 0.35 ^(†)
P_orb (d)	2.6278838 ± 0.0000037	${15.61031}_{- 0.00010}^{+ 0.00012}$ $\[15.61031_{-0.00010}^{+0.00012}\]$
T₀ (BJD – 2459000)	771.7145 ± 0.0013	799.3065 ± 0.0029
T₁₄ (h)	1.20 ± 0.05	${6.00}_{- 0.15}^{+ 0.17}$ $\[6.00_{-0.15}^{+0.17}\]$
R_p/R_⋆	${0.0292}_{- 0.0017}^{+ 0.0020}$ $\[0.0292_{-0.0017}^{+0.0020}\]$	0.0198 ± 0.0007
b	${0.903}_{- 0.044}^{+ 0.029}$ $\[0.903_{-0.044}^{+0.029}\]$	${0.41}_{- 0.13}^{+ 0.09}$ $\[0.41_{-0.13}^{+0.09}\]$
i (deg)	${85.08}_{- 0.56}^{+ 0.44}$ $\[85.08_{-0.56}^{+0.44}\]$	${88.72}_{- 0.34}^{+ 0.43}$ $\[88.72_{-0.34}^{+0.43}\]$
a/R_⋆	${9.58}_{- 0.29}^{+ 0.27}$ $\[9.58_{-0.29}^{+0.27}\]$	${18.44}_{- 0.76}^{+ 0.69}$ $\[18.44_{-0.76}^{+0.69}\]$
q₁ (TESS)	${0.47}_{- 0.24}^{+ 0.27}$ $\[0.47_{-0.24}^{+0.27}\]$	${0.52}_{- 0.30}^{+ 0.32}$ $\[0.52_{-0.30}^{+0.32}\]$
q₂ (TESS)	${0.48}_{- 0.32}^{+ 0.33}$ $\[0.48_{-0.32}^{+0.33}\]$	${0.28}_{- 0.20}^{+ 0.31}$ $\[0.28_{-0.20}^{+0.31}\]$
$\sqrt{e} \sin ω_{}$ $\[\sqrt{e} \sin~ \omega_{}\]$	$- {0.31}_{- 0.18}^{+ 0.28}$ $\[-0.31_{-0.18}^{+0.28}\]$	−
$\sqrt{e} \cos ω_{}$ $\[\sqrt{e} \cos~ \omega_{}\]$	0.30 ± 0.08	−
Derived
M_p (M_⊕)	${9.5}_{- 1.9}^{+ 1.7}$ $\[9.5_{-1.9}^{+1.7}\]$	${10.3}_{- 1.3}^{+ 1.4}$ $\[10.3_{-1.3}^{+1.4}\]$
R_p (R_⊕)	${2.46}_{- 0.16}^{+ 0.18}$ $\[2.46_{-0.16}^{+0.18}\]$	3.08 ± 0.14
ρ_p (g cm⁻³)	${3.46}_{- 0.90}^{+ 1.02}$ $\[3.46_{-0.90}^{+1.02}\]$	${1.93}_{- 0.34}^{+ 0.41}$ $\[1.93_{-0.34}^{+0.41}\]$
log g_p (cgs)	$15_{- 3}^{+ 4}$ $\[15_{-3}^{+4}\]$	11 ± 2
a (au)	0.0344 ± 0.0014	0.1223 ± 0.0060
$T_{eq}^{(‡)} (K)$ $\[T_{\text {eq }}^{(\ddagger)}(\mathrm{K})\]$	1108 ± 20	$950_{- 18}^{+ 21}$ $\[950_{-18}^{+21}\]$
e	${0.300}_{- 0.082}^{+ 0.083}$ $\[0.300_{-0.082}^{+0.083}\]$	<0.20
ω_* (deg)	$- 36_{- 19}^{+ 33}$ $\[-36_{-19}^{+33}\]$	unconstrained
TSM	$103_{- 22}^{+ 35}$ $\[103_{-22}^{+35}\]$	$56_{- 9}^{+ 11}$ $\[56_{-9}^{+11}\]$
u₁ (TESS)	${0.63}_{- 0.44}^{+ 0.56}$ $\[0.63_{-0.44}^{+0.56}\]$	${0.41}_{- 0.30}^{+ 0.53}$ $\[0.41_{-0.30}^{+0.53}\]$
u₂ (TESS)	${0.04}_{- 0.44}^{+ 0.46}$ $\[0.04_{-0.44}^{+0.46}\]$	${0.30}_{- 0.39}^{+ 0.37}$ $\[0.30_{-0.39}^{+0.37}\]$
Instrumental
σ_TESS (ppt)	315 ± 15	143 ± 4
${\bar{μ}}_{HARPS} (m s^{- 1})$ $\[\bar{\mu}_{\text {HARPS }}\left(\mathrm{m} \mathrm{s}^{-1}\right)\]$	$- {2.21}_{- 0.61}^{+ 0.65}$ $\[-2.21_{-0.61}^{+0.65}\]$	−
${\bar{μ}}_{HARPS-N} (m s^{- 1})$ $\[\bar{\mu}_{\text {HARPS-N }}\left(\mathrm{m} \mathrm{s}^{-1}\right)\]$	−	−20801.85 ± 0.28
σ_w,HARPS (m s⁻¹)	${2.70}_{- 0.52}^{+ 0.61}$ $\[2.70_{-0.52}^{+0.61}\]$	−
σ_w,HARPS-N (m s⁻¹)	−	${1.63}_{- 0.21}^{+ 0.24}$ $\[1.63_{-0.21}^{+0.24}\]$

Notes. Best-fit median values, with upper and lower 68% credibility bands as errors, of the fitted and derived parameters for TOI-5800 b and TOI-5817 b, as extracted from the posterior distribution of the relative models. ^(†) This value is comparable to the formal uncertainties of SOPHIE RVs, but it is ~3 times smaller than their actual spread, which justifies their exclusion from the global fit. ^(‡) This is the equilibrium temperature for a zero Bond albedo and uniform heat redistribution to the night side. The eccentricity upper limit on TOI-5817 b is constrained at the confidence level of 1σ.

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