Multimodal atmospheric characterization of β Pictoris b - Adding high-resolution continuum spectra from GRAVITY

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Volume 704 (December 2025)

A&A, 704 (2025) A325

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Table B.1

Grid priors and posteriors for the "free" approach

Parameter	T_eff (K)	log(g) (dex)	[M/H]	C/O	γ	f_sed	log(¹²C/¹³C)
Exo-REM priors	U (1200, 2000)	U(3.5, 4.5)	U (− 0.5, 1)	U (0.4, 0.65)			U (1.0, 2.6)
Exo-REM posteriors
GRAVITY	B (1553.23, 1601.08)	B (4.19, 4.42)	B (0.66, 0.81)	0.55 ± 0.01			< 1.07
… + GPI, phot	${1486.75}_{- 12.71}^{+ 9.85}$ $1486.75_{ - 12.71}^{ + 9.85}$	${3.82}_{- 0.06}^{+ 0.05}$ $3.82_{ - 0.06}^{ + 0.05}$	0.82 ± 0.03	B(0.55, 0.65)			< 1.08
… + SPHERE	${1487.85}_{- 11.75}^{+ 9.16}$ $1487.85_{ - 11.75}^{ + 9.16}$	${3.82}_{- 0.06}^{+ 0.05}$ $3.82_{ - 0.06}^{ + 0.05}$	${0.82}_{- 0.05}^{+ 0.04}$ $0.82_{ - 0.05}^{ + 0.04}$	> 0.648			< 1.08
… + MATISSE	1503.21 ± 2.55	${4.01}_{- 0.01}^{+ 0.02}$ $4.01_{ - 0.01}^{ + 0.02}$	0.52 ± 0.02	0.554 ± 0.003			< 1.04
… + MIRI	${1503.14}_{- 2.48}^{+ 2.58}$ $1503.14_{ - 2.48}^{ + 2.58}$	${4.01}_{- 0.01}^{+ 0.02}$ $4.01_{ - 0.01}^{ + 0.02}$	0.52 ± 0.02	0.554 ± 0.003			< 1.04
… + SINFONI	${1503.38}_{- 2.31}^{+ 2.30}$ $1503.38_{ - 2.31}^{ + 2.30}$	4.00 ± 0.01	${0.51}_{- 0.01}^{+ 0.02}$ $0.51_{ - 0.01}^{ + 0.02}$	${0.552}_{- 0.002}^{+ 0.003}$ $0.552_{ - 0.002}^{ + 0.003}$			${1.12}_{- 0.08}^{+ 0.11}$ $1.12_{ - 0.08}^{ + 0.11}$

ATMO priors	U (1400, 1900)	U (3.5, 4.5)	U(−0.6, 0.6)		U (1.01, 1.05)
ATMO posteriors
GRAVITY	> 1897.74	3.63 ± 0.05	< −0.596		1.0198 ± 0.0002
… + GPI, phot	${1841.16}_{- 7.99}^{+ 8.46}$ $1841.16_{ - 7.99}^{ + 8.46}$	< 3.53	< −0.596		1.0194 ± 0.0002
… + SPHERE	${1838.17}_{- 7.84}^{+ 8.02}$ $1838.17_{ - 7.84}^{ + 8.02}$	< 3.53	< −0.596		1.0194 ± 0.0002
… + MATISSE	${1893.89}_{- 5.52}^{+ 3.64}$ $1893.89_{ - 5.52}^{ + 3.64}$	< 3.505	−0.599 ± 0.001		1.0147 ± 0.0001
… + MIRI	> 1894.05	< 3.503	< −0.599		1.0147 ± 0.0001
… + SINFONI	> 1897.74	< 3.504	< −0.599		1.0150 ± 0.0001

BT-Settl priors	U (1400, 2000)	U (3.5, 5.0)		U (0.2754, 1.096)
BT-Settl posteriors
GRAVITY	${1668.48}_{- 5.87}^{+ 5.49}$ $1668.48_{ - 5.87}^{ + 5.49}$	3.60 ± 0.04		0.65 ± 0.02
…+GPI, phot	${1748.93}_{- 3.86}^{+ 3.87}$ $1748.93_{ - 3.86}^{ + 3.87}$	${3.67}_{- 0.02}^{+ 0.03}$ $3.67_{ - 0.02}^{ + 0.03}$		0.59 ± 0.01
…+SPHERE	${1748.50}_{- 3.88}^{+ 3.86}$ $1748.50_{ - 3.88}^{ + 3.86}$	3.68 ± 0.02		0.59 ± 0.01
…+MATISSE	${1890.09}_{- 2.54}^{+ 2.59}$ $1890.09_{ - 2.54}^{ + 2.59}$	< 3.50		0.969 ± 0.001
…+MIRI	${1890.21}_{- 2.56}^{+ 2.46}$ $1890.21_{ - 2.56}^{ + 2.46}$	< 3.50		0.969 ± 0.001
…+SINFONI	${1893.97}_{- 2.53}^{+ 2.55}$ $1893.97_{ - 2.53}^{ + 2.55}$	< 3.50		0.968 ± 0.001

Sonora priors	U (900, 2400)	U(3.5, 5.5)	U(−0.5, 0.5)			U(1, 8)
Sonora posteriors
GRAVITY	${1625.43}_{- 11.48}^{+ 11.41}$ $1625.43_{ - 11.48}^{ + 11.41}$	${4.56}_{- 0.07}^{+ 0.06}$ $4.56_{ - 0.07}^{ + 0.06}$	> 0.487			< 1.03
…+GPI, photo	${1521.60}_{- 6.41}^{+ 7.12}$ $1521.60_{ - 6.41}^{ + 7.12}$	4.25 ± 0.04	> 0.492			< 1.03
…+SPHERE	${1521.38}_{- 6.62}^{+ 6.85}$ $1521.38_{ - 6.62}^{ + 6.85}$	4.25 ± 0.04	> 0.493			< 1.03
…+MATISSE	${1588.51}_{- 7.82}^{+ 6.95}$ $1588.51_{ - 7.82}^{ + 6.95}$	4.60 ± 0.02	> 0.497			< 1.01
…+MIRI	${1589.41}_{- 7.66}^{+ 7.06}$ $1589.41_{ - 7.66}^{ + 7.06}$	4.60 ± 0.02	> 0.496			< 1.01
…+SINFONI	${1593.35}_{- 6.35}^{+ 5.10}$ $1593.35_{ - 6.35}^{ + 5.10}$	4.60 ± 0.02	> 0.497			< 1.01

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