The mid-infrared spectrum of β Pictoris b - First VLTI/MATISSE interferometric observations of an exoplanet

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Volume 704 (December 2025)

A&A, 704 (2025) A182

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Table 3

Best-fit parameters found with ForMoSA on the Exo-REM model grid.


Parameters	Priors		Posteriors
		GRAVITY (fixed)	GRAVITY	GRAVITY	MATISSE
		+ MATISSE	+ MATISSE (fixed)*	only	only
Fitted parameters

T_eff [K]	𝒰(400, 2000)	1529 ± 3	1529 ± 3	1524 ± 4	1700 ± 3
log g [dex]	𝒰(3, 5)	3.84 ± 0.03	3.83 ± 0.04	${3.86}_{- 0.04}^{+ 0.03}$ $\[3.86_{-0.04}^{+0.03}\]$	${4.05}_{- 0.03}^{+ 0.04}$ $\[4.05_{-0.03}^{+0.04}\]$
[M/H]	𝒰(−0.5, 1.0)	0.30 ± 0.03	0.30 ± 0.03	${0.34}_{- 0.04}^{+ 0.03}$ $\[0.34_{-0.04}^{+0.03}\]$	0.00 ± 0.02
C/O	𝒰(0.1, 0.8)	${0.539}_{- 0.002}^{+ 0.003}$ $\[0.539_{-0.002}^{+0.003}\]$	0.539 ± 0.003	0.524 ± 0.004	0.776 ± 0.002
M [M_Jup]	𝒩(12.7, 2.2)	10.5 ± 0.7	11.8 ± 0.9	11.1 ± 0.8	${12.7}_{- 1.5}^{+ 1.3}$ $\[12.7_{-1.5}^{+1.3}\]$
d [pc]	𝒩(19.44, 0.05)	19.44 ± 0.05	19.44 ± 0.05	19.45 ± 0.05	19.44 ± 0.05
α_GRAVITY	1 or 𝒰(0.1, 2.0)	1 (fixed)	1.151 ± 0.006	1 (fixed)	−
α_MATISSE	1 or 𝒰(0.1, 2.0)	0.870 ± 0.004	1 (fixed)	−	1 (fixed)

Derived parameters

R [R_Jup]	−	1.943 ± 0.008	${2.085}_{- 0.009}^{+ 0.008}$ $\[2.085_{-0.009}^{+0.008}\]$	1.957 ± 0.009	1.74 ± 0.02
log L/L_⊙	−	−3.726 ± 0.002	−3.666 ± 0.003	−3.725 ± 0.003	$- {3.640}_{- 0.004}^{+ 0.005}$ $\[-3.640_{-0.004}^{+0.005}\]$

Goodness of fit

log z	−	−790.6 ± 0.2	−790.2 ± 0.2	−285.2 ± 0.4	−399.8 ± 0.4
$χ_{r, total}^{2}$ $\[\chi_{r, \text {total}}^{2}\]$	−	3.2943	3.2937	−	−
$χ_{r, GRAVITY}^{2}$ $\[\chi_{r, \text {GRAVITY}}^{2}\]$	−	2.3847	2.3839	2.342	−
$χ_{r, MATISSE}^{2}$ $\[\chi_{r, \text {MATISSE}}^{2}\]$	−	4.2840	4.2837	−	3.297

Notes. 𝒰(x_min, x_max) and 𝒩(μ, σ) designate a uniform prior between x_min and x_max, and a Gaussian prior of mean μ and standard deviation σ, respectively. The model marked with an asterisk is the model used later in the paper.

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