Binary orbit and disks properties of the RW Aur system using ALMA observations

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Volume 692 (December 2024)

A&A, 692 (2024) A155

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Table 3

Orbital parameters of the RW Aur binary.

Parameter	Best + 1σ	t_peri > 0	units
d_peri	${55.0}_{- 27.0}^{+ 477.5}$ ${55.0_{ - 27.0}^{ + 477.5}}$	${55.0}_{- 27.0}^{+ 334.0}$ ${55.0_{ - 27.0}^{ + 334.0}}$	au
ecc	${0.787}_{- 0.284}^{+ 1.155}$ ${0.787_{ - 0.284}^{ + 1.155}}$	${0.787}_{- 0.283}^{+ 0.35}$ ${0.787_{ - 0.283}^{ + 0.35}}$	–
inc	${129.8}_{- 29.9}^{+ 12.2}$ ${129.8_{ - 29.9}^{ + 12.2}}$	${129.8}_{- 26.2}^{+ 21.3}$ ${129.8_{ - 26.2}^{ + 21.3}}$	deg
Ω	${73.8}_{- 21.0}^{+ 73.7}$ ${73.8_{ - 21.0}^{ + 73.7}}$	${73.8}_{- 19.1}^{+ 73.6}$ ${73.8_{ - 19.1}^{ + 73.6}}$	deg
ω	${42.3}_{- 5.4}^{+ 77.6}$ ${42.3_{ - 5.4}^{ + 77.6}}$	${42.3}_{- 5.4}^{+ 70.1}$ ${42.3_{ - 5.4}^{ + 70.1}}$	deg
t_peri	${295.4}_{- 456.7}^{+ 136.0}$ $295.4_{ - 456.7}^{ + 136.0}$	${295.4}_{- 227.0}^{+ 136.0}$ $295.4_{ - 227.0}^{ + 136.0}$	yrs

parallax	6.406 ± 0.044	6.406 ± 0.044	mas
m_tot	$2.233 \pm 0.05 \cdot \sqrt{2}$ $2.233 \pm 0.05 \cdot \sqrt 2$	$2.233 \pm 0.05 \cdot \sqrt{2}$ $2.233 \pm 0.05 \cdot \sqrt 2$	M_⊙

Notes. The values shown are the highest likelihood solutions, and 1σ deviation for the orbit of RWAurB around RW Aur A. t_peri is relative to the last observation of ALMA, with positive values in the past, and negative values for future. Second column shows the 1σ uncertainty when considering orbits where the periastron is in the past. Parallax and total mass are sampled from Normal distributions with a standard deviation equal to the reported 1σ. Posterior distributions are shown in Fig. A.2.

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