A tidally detached super Neptune on a strongly misaligned retrograde orbit

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Volume 709 (May 2026)

A&A, 709 (2026) L15

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Table H.1.

Priors and outcomes of RM modelling.

Parameter	Unit	Prior	Value

Planetary parameters
Orbital period (P_b)	days	𝒰(24.282,	24.28336(1)
		24.284)
Central transit time (T₀)	BTJDa	𝒰(2031.1,	2031.2301(4)
		2031.3)
Scaled semi-maj. axis ( $\frac{a_{b}}{R_{★}}$ $Mathematical equation: $ \frac{a_{\mathrm{b}}}{R_{\star}} $$ )		...	36.3 $_{- 0.7}^{+ 0.6}$ $Mathematical equation: $ ^{+0.6}_{-0.7} $$
Orbital semi-maj. axis (a_b)	au	...	0.163±0.003
Orbital inclination (i_b)	deg	...	89.82 $_{- 0.17}^{+ 0.12}$ $Mathematical equation: $ ^{+0.12}_{-0.17} $$
Orbital eccentricity (e_b)		𝒰(0.0, 0.95)	0.04 $_{- 0.03}^{+ 0.07}$ $Mathematical equation: $ ^{+0.07}_{-0.03} $$
RV semi-amplitude (K_b)	m s⁻¹	𝒰(0.001, 100)	2.97 $_{- 0.64}^{+ 0.62}$ $Mathematical equation: $ ^{+0.62}_{-0.64} $$
Planet/star rad. ratio ( $\frac{R_{p}}{R_{★}}$ $Mathematical equation: $ \frac{R_{\mathrm{p}}}{R_{\star}} $$ )		𝒰(0.0, 0.5)	0.04979(35)
Impact parameter (b)		𝒰(0.0, 2.0)	0.109 $_{- 0.076}^{+ 0.11}$ $Mathematical equation: $ ^{+0.11}_{-0.076} $$
Transit duration (T₁₄)	days	...	0.2216 $_{- 0.0034}^{+ 0.0044}$ $Mathematical equation: $ ^{+0.0044}_{-0.0034} $$
Planetary radius (R_b)	R_⊕	...	5.258±0.085
Planetary mass (M_b)	M_⊕	...	13.2 $_{- 2.9}^{+ 2.8}$ $Mathematical equation: $ ^{+2.8}_{-2.9} $$
Planetary density (ρ_b)	g cm⁻³	...	0.50±0.11
Arg. of pericentre (ω)	deg	...	126 $_{- 119}^{+ 67}$ $Mathematical equation: $ ^{+67}_{-119} $$
Sky-proj. obliquity (λ)	deg	𝒰(0.0, 360)	176 $_{- 27}^{+ 29}$ $Mathematical equation: $ ^{+29}_{-27} $$
True 3D obliquity (ψ)	deg	...	149 $_{- 10}^{+ 11}$ $Mathematical equation: $ ^{+11}_{-10} $$

Stellar parameters

Density (ρ_★)	ρ_⊙	𝒩(1.08, 0.08)b	1.09 $_{- 0.06}^{+ 0.05}$ $Mathematical equation: $ ^{+0.05}_{-0.06} $$
Radius (R_★)	R_⊙	𝒩(0.968, b	0.968±0.014
		0.016)b
Rotation period (P_rot)	days	𝒰(8.0, 24)	21.48±0.20
Decay Timescale (P_dec)	days	𝒰(40, 1000)	69 $_{- 16}^{+ 22}$ $Mathematical equation: $ ^{+22}_{-16} $$
Coherence scale (ω)		𝒩(0.35, 0.035)c	0.39±0.03
Rotat. velocity (v sin i_★)	km s⁻¹	𝒩(2.3, 0.4)c	2.17 $_{- 0.17}^{+ 0.10}$ $Mathematical equation: $ ^{+0.10}_{-0.17} $$
Quadratic LD coeff. (u₁)		𝒩(0.62, 0.11)	0.63±0.11
Quadratic LD coeff. (u₂)		𝒩(0.11, 0.12)	0.13±0.12
Stellar inclination (i_★)	deg	𝒰(0, 180)	72 $_{- 11}^{+ 12}$ $Mathematical equation: $ ^{+12}_{-11} $$
Convective blueshift (c₁)		𝒰(−2, 0)	−0.69 $_{- 0.59}^{+ 0.46}$ $Mathematical equation: $ ^{+0.46}_{-0.59} $$
Equatorial velocity (v_eq)	km s⁻¹	𝒰(0, 70)	2.28±0.04

Notes. ^(a)BTJD = BJD_TDB - 2457000.0. ^(b)K22. ^(c)Nardiello et al. (2022).

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