Astrometric and photometric characterization of η Tel B combining two decades of observations

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Table 6

Priors and initial and distribution of parameters for η Tel system astrometrical fitting^(a).

Priors	η Tel A	η Tel B
Mass (M_⊙)	2.09 ± 0.03	0.045 ± 0.014
Parallax (mas)	20.603 ± 0.099	20.603 ± 0.099
RA p.m. (mas/yr⁻¹)	25.689 ± 0.006	25.689 ± 0.006
DEC p.m. (mas/yr⁻¹)	−82.807 ± 0.006	−82.807 ± 0.006

Initial distribution^(b)

a (au)	–	$220_{- 220}^{+ 300}$ $220_{ - 220}^{ + 300}$
$\sqrt{e}$ $\sqrt e$ * sin(ω)	–	0.4± 0.3
$\sqrt{e}$ $\sqrt e$ * cos(ω)	–	0.4± 0.3
i (radians)	–	1.57 ± 1.57
Ω (radians)	–	3.2 ± 2.2
l (radians)	–	0.8 ± 0.5

Notes. ^(a)Unphysical values such as negative values for masses or semi-major axis are automatically excluded from the code. ^(b)The initial distributions involve a lognormal distribution for the semi-major axis, while all other orbital values follow a normal distribution.

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