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 3

Orbital parameter priors and posteriors.

Parameter	Prior type and range	Posterior
Semi-major axis (AU)	Log uniform [10⁻⁵, 10³]	${15.8}_{- 1.0}^{+ 1.7}$ $\SI{15.8(1.7:1.0)}{}$
Eccentricity	Uniform [0, 1)	${0.31}_{- 0.12}^{+ 0.06}$ $\SI{0.31(6:12)}{}$
Inclination (deg)	Sine [0, π)	$152_{- 8}^{+ 10}$ $\SI{152(10:8)}{}$
Argument of periastron (deg)	Uniform [0, 2`π`)	$210_{- 50}^{+ 90}$ $\SI{210(90:50)}{}$
Long. of ascending node (deg)	Uniform [0, 2`π`)	$190_{- 30}^{+ 120}$ $\SI{190(120:30)}{}$
Relative epoch of periastron²	Uniform [0, 1)	${0.36}_{- 0.06}^{+ 0.06}$ $\SI{0.36(6:6)}{}$
Parallax (mas)	Gaussian (24.55 ± 0.09)^*	${24.56}_{- 0.08}^{+ 0.08}$ $\SI{24.56(8:8)}{}$
Stellar mass (M_⊙)	Gaussian (1.8 ± 0.2)^†	${1.9}_{- 0.2}^{+ 0.2}$ $\SI{1.9(2:2)}{}$
Companion mass (M_Jup)	Uniform [1, 50]	$17_{- 5}^{+ 6}$ $\SI{17(6:5)}{}$

Notes. For the log uniform and uniform distributions, the square and rounded brackets denote inclusive and exclusive boundaries, respectively. The reported values were rounded to their significant figures. They correspond to the marginalised posterior distribution median and its differences to the 84th and 16th percentiles in superscript and subscript, respectively (see Fig. 4 and Appendix A for the marginalised posteriors). ^* Gaia Collaboration (2023).^† Currie et al. (2023).

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