NIRPS and TESS reveal a peculiar system around the M dwarf TOI-756: A transiting sub-Neptune and a cold eccentric giant

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Volume 702 (October 2025)

A&A, 702 (2025) A138

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Table C.1

Median values and 68% confidence intervals of the posterior distributions of the TESS-only fit.

Parameter	Prior	Value
Stellar parameters
Stellar density, ρ_* (ρ_⊙) . . . . .	𝒩(5350, 230)	$5291_{- 163}^{+ 156}$ $\[5291_{-163}^{+156}\]$
Parameters for TOI-756 b
Orbital period, P (days) . . . . .	𝒩(1.23926, 0.1)	1.239250 ± 0.000001
Semi-major axis, a (AU) . . . . .	-	0.0182 ± 0.0003
Transit epoch, T₀ (BJD) . . . .	𝒩(2458570.65, 0.1)	${58570.65187}_{- 0.00073}^{+ 0.00067}$ $\[58570.65187_{-0.00073}^{+0.00067}\]$
Scaled planetary radius, R_P/R_*.	𝒰(0, 1)	0.0486 ± 0.0013
Impact parameter, b . . . . . .	𝒰(0, 1)	${0.541}_{- 0.047}^{+ 0.037}$ $\[0.541_{-0.047}^{+0.037}\]$
Inclination, i (deg) . . . . . . .	-	${85.92}_{- 0.31}^{+ 0.39}$ $\[85.92_{-0.31}^{+0.39}\]$
Eccentricity, e . . . . . . . . .	Fixed	0.0
Argument of periastron, ω (deg).	Fixed	90.0
Limb darkening parameters
Limb darkening parameter, q_1,TESS	𝒩(0.792, 0.029)	0.795 ± 0.029
Limb darkening parameter, q_2,TESS	𝒩(0.453, 0.022)	0.455 ± 0.021

Notes. 𝒩(μ, σ²) indicates a normal distribution with mean μ and variance σ², 𝒰(a, b) a uniform distribution between a and b.

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