The GAPS Programme at the TNG - LXXII. TOI-5734b: A hot sub-Neptune orbiting a relatively young K dwarf with an Earth-like density

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Volume 708 (April 2026)

A&A, 708 (2026) A90

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Table 2

Nested sampling priors and posteriors (median and the 16^th and 84^th percentiles) of TOI-5734b orbital parameters.

Parameter	Unit	Adopted Priors	Posterior
Orbital parameters
RV semi-amplitude (K_b)	m/s	𝒰(0, 50)	${3.9}_{- 1.1}^{+ 1.1}$ $Mathematical equation: $\[3.9_{-1.1}^{+1.1}\]$$
Orbital Period (P_b)	days	𝒰(6.18, 6.19)	${6.1841876}_{- 0.0000094}^{+ 0.0000080}$ $Mathematical equation: $\[6.1841876_{-0.0000094}^{+0.0000080}\]$$
Orbital inclination (i_b)	deg	𝒩(90, 3) [80, 90]	${89.88}_{- 0.63}^{+ 0.12}$ $Mathematical equation: $\[89.88_{-0.63}^{+0.12}\]$$
e sin(ω)		(fixed)	0
e cos(ω)		(fixed)	0
Central time of the first transit (t₀, b)	BJD	𝒰(2458842, 2458843)	${2458842.5107}_{- 0.0012}^{+ 0.0016}$ $Mathematical equation: $\[2458842.5107_{-0.0012}^{+0.0016}\]$$
Scaled planetary radius (R_b/R_⋆)		𝒰(0.01, 0.12)	${0.03011}_{- 0.00064}^{+ 0.00066}$ $Mathematical equation: $\[0.03011_{-0.00064}^{+0.00066}\]$$
Stellar density	kg/m³	𝒩(3900, 800)	$3119_{- 340}^{+ 210}$ $Mathematical equation: $\[3119_{-340}^{+210}\]$$

Derived planetary parameters

Semi-major axis (a_b)	au		${0.05921}_{- 0.00024}^{+ 0.00024}$ $Mathematical equation: $\[0.05921_{-0.00024}^{+0.00024}\]$$
Impact parameter (b_b)			${0.04}_{- 0.04}^{+ 0.22}$ $Mathematical equation: $\[0.04_{-0.04}^{+0.22}\]$$
Transit duration (T_{b, 1,4})	days		${0.0991}_{- 0.0070}^{+ 0.0061}$ $Mathematical equation: $\[0.0991_{-0.0070}^{+0.0061}\]$$
Planet mass (M_b)	M_⊕		${9.1}_{- 2.6}^{+ 2.6}$ $Mathematical equation: $\[9.1_{-2.6}^{+2.6}\]$$
Planet radius (R_b)	R_⊕		${2.10}_{- 0.12}^{+ 0.12}$ $Mathematical equation: $\[2.10_{-0.12}^{+0.12}\]$$
Planet density (ρ_b)	ρ_⊕		${0.98}_{- 0.30}^{+ 0.36}$ $Mathematical equation: $\[0.98_{-0.30}^{+0.36}\]$$
Equilibrium temperature (T_eq)	K		$688_{- 23}^{+ 23}$ $Mathematical equation: $\[688_{-23}^{+23}\]$$
Surface gravity (g_b)	m/s²		${20.2}_{- 6.0}^{+ 6.6}$ $Mathematical equation: $\[20.2_{-6.0}^{+6.6}\]$$

Notes. The main planetary parameters derived from the analysis are shown at the bottom of the table, while the complementary parameters (e.g. GP hyperparameters) are reported in Table A.2. The inclination, i_b, and the impact parameter, b_b, are expressed in terms of posterior mode and the 68% HPD interval.

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