Optical polarimetry of the accreting black hole X-ray binary Swift J1727.8−1613 over the state transition and radio ejections

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Table A.2.

Polarimetric data for the field stars.

		B		V		R
Star	π (mas)	PD (%)	PA (deg)	PD (%)	PA (deg)	PD (%)	PA (deg)
1	0.12 ± 0.02	2.15 ± 0.38	76.0 ± 5.0	1.27 ± 0.16	63.8 ± 3.6	1.36 ± 0.08	68.1 ± 1.6
2	0.17 ± 0.02	1.16 ± 0.01	67.0 ± 0.3	1.183 ± 0.001	70.23 ± 0.04	1.205 ± 0.001	69.46 ± 0.03
3	0.18 ± 0.03	1.58 ± 0.04	63.1 ± 0.7	1.686 ± 0.002	61.54 ± 0.03	1.635 ± 0.003	61.85 ± 0.06
4	0.20 ± 0.02	1.106 ± 0.005	75.4 ± 0.1	1.194 ± 0.006	71.9 ± 0.2	1.197 ± 0.001	70.65 ± 0.03
5	0.20 ± 0.02	1.154 ± 0.009	74.3 ± 0.2	1.143 ± 0.008	70.8 ± 0.2	1.186 ± 0.002	72.63 ± 0.04
6	0.31 ± 0.02	1.36 ± 0.14	76.9 ± 3.0	1.26 ± 0.13	74.7 ± 2.9	1.25 ± 0.04	73.2 ± 1.0
7	0.39 ± 0.02	1.29 ± 0.12	59.7 ± 2.6	1.40 ± 0.07	55.0 ± 1.5	1.46 ± 0.03	58.6 ± 0.6
8	0.41 ± 0.02	1.26 ± 0.09	65.3 ± 2.1	1.21 ± 0.11	53.1 ± 2.7	1.50 ± 0.06	61.7 ± 1.1
9	0.43 ± 0.02	1.31 ± 0.04	74.1 ± 0.8	1.046 ± 0.004	72.4 ± 0.1	1.400 ± 0.003	73.31 ± 0.07
10	0.74 ± 0.02	1.07 ± 0.02	74.3 ± 0.5	1.09 ± 0.02	71.3 ± 0.4	1.234 ± 0.006	69.4 ± 0.1
11	0.89 ± 0.03	1.04 ± 0.02	73.5 ± 0.6	1.06 ± 0.07	64.2 ± 2.0	0.67 ± 0.03	70.0 ± 1.1

Notes. π is the parallax to the stars in milliarcseconds. In this work, we considered two different distance estimates to Swift J1727.8−1613 of $5 . 5_{- 1.1}^{+ 1.4}$ $Mathematical equation: $ 5.5^{+1.4}_{-1.1} $$ kpc from Burridge et al. (2025) and 3.4 ± 0.3 kpc from Mata Sánchez et al. (2025), which correspond to π = 0.18 ± 0.04 and 0.30 ± 0.03 mas, respectively.

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