Orbit and atmosphere of HIP 99770 b through the eyes of VLTI/GRAVITY

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Volume 700 (August 2025)

A&A, 700 (2025) A4

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Table 4

Atmospheric forward modelling posteriors.

Model	$χ_{r e d}^{2}$ $\chi_\mathrm{red}^2$	T_eff (K)	log(g)	R (R_Jup)	M (M_Jup)	[Fe/H]
`DRIFT-PHOENIX`	2.06	$1772_{- 11}^{+ 11}$ $\SI{1772(11:11)}{}$	${5.03}_{- 0.06}^{+ 0.08}$ $\SI{5.03(8:6)}{}$	${0.587}_{- 0.009}^{+ 0.011}$ $\SI{0.587(11:9)}{}$	$15_{- 2}^{+ 3}$ $\SI{15(3:2)}{}$	${0.25}_{- 0.06}^{+ 0.03}$ $\SI{0.25(3:6)}{}$
`BT-Settl`	1.25	$1380_{- 20}^{+ 20}$ $\SI{1380(20:20)}{}$	${3.95}_{- 0.02}^{+ 0.02}$ $\SI{3.95(2:2)}{}$	${0.99}_{- 0.03}^{+ 0.04}$ $\SI{0.99(4:3)}{}$	${3.5}_{- 0.2}^{+ 0.2}$ $\SI{3.5(2:2)}{}$	−
Sonora-Diamondback	1.06	$1300_{- 20}^{+ 20}$ $\SI{1300(20:20)}{}$	${3.62}_{- 0.08}^{+ 0.15}$ $\SI{3.62(15:8)}{}$	${1.05}_{- 0.04}^{+ 0.04}$ $\SI{1.05(4:4)}{}$	${1.8}_{- 0.3}^{+ 0.7}$ $\SI{1.8(7:3)}{}$	${0.27}_{- 0.12}^{+ 0.12}$ $\SI{0.27(12:12)}{}$
SM Cloudy 2008*	2.08	$1539_{- 27}^{+ 17}$ $\SI{1539(17:27)}{}$	${4.16}_{- 0.06}^{+ 0.07}$ $\SI{4.16(7:6)}{}$	${1.5}_{- 0.3}^{+ 0.3}$ $\SI{1.5(3:3)}{}$	$13_{- 4}^{+ 4}$ $\SI{13(4:4)}{}$	−

Notes. The values were rounded to their significant figure. They correspond to the median of the marginalised posterior distribution and its differences to the 84th and 16th percentiles in superscript and subscript, respectively. These results stem from the sampling runs employing an informative underlying companion mass prior (see corner plots in Appendix B for uninformative mass prior posteriors). ^*f_sed = 2 model of Saumon & Marley (2008).

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