Table 3.
Average intrinsic optical polarization of Swift J1727.8−1613 in different spectral states considering two estimates for IS polarization: using field stars 2, 4, and 5, and using field stars 2–9.
| B | V | R | |||||
|---|---|---|---|---|---|---|---|
| State | MJD | PD (%) | PA (deg) | PD (%) | PA (deg) | PD (%) | PA (deg) |
| Average 2, 4, 5 | |||||||
| HIMS | 60189–60205 | 0.211 ± 0.001 | −6.6 ± 0.2 | 0.260 ± 0.002 | −14.3 ± 0.2 | 0.424 ± 0.002 | −11.7 ± 0.1 |
| SIMS | 60206–60215 | 0.082 ± 0.002 | 23.9 ± 0.6 | 0.103 ± 0.007 | 6.2 ± 2.0 | 0.096 ± 0.003 | −10.0 ± 0.9 |
| HIMS+SIMS | 60189–60215 | 0.185 ± 0.001 | −4.9 ± 0.2 | 0.229 ± 0.002 | −12.8 ± 0.3 | 0.345 ± 0.002 | −11.6 ± 0.2 |
| SS | 60351–60361 | < 0.33 | ... | 0.29 ± 0.10 | 18 ± 10 | 0.45 ± 0.05 | 7.8 ± 3.1 |
| DHS | 60388–60391 | 0.13 ± 0.07 | 13 ± 16 | 0.48 ± 0.09 | 67 ± 5 | 0.09 ± 0.08 | −20 ± 23 |
| Average 2–9 | |||||||
| HIMS | 60189–60205 | 0.215 ± 0.001 | −7.7 ± 0.2 | 0.297 ± 0.002 | −20.0 ± 0.2 | 0.441 ± 0.002 | −12.9 ± 0.1 |
| SIMS | 60206–60215 | 0.077 ± 0.002 | 21.4 ± 0.6 | 0.109 ± 0.007 | −12.0 ± 1.9 | 0.113 ± 0.003 | −15.1 ± 0.7 |
| HIMS+SIMS | 60189–60215 | 0.188 ± 0.001 | −6.2 ± 0.2 | 0.264 ± 0.002 | −19.4 ± 0.3 | 0.362 ± 0.002 | −13.1 ± 0.2 |
| SS | 60351–60361 | 0.12 ± 0.11 | −75 ± 27 | 0.26 ± 0.10 | 12 ± 11 | 0.45 ± 0.05 | 6.2 ± 3.1 |
| DHS | 60388–60391 | 0.13 ± 0.07 | 12 ± 16 | 0.44 ± 0.09 | 70 ± 6 | 0.12 ± 0.08 | −23 ± 19 |
Notes. The PA is given only for measurements where the PD has a significance > 1σ. We note that the PA for low-significance detections does not follow a normal distribution (Vinokur 1965; Clarke & Stewart 1986; Naghizadeh-Khouei & Clarke 1993) and the error on the PA is just a formal error from Eq. (3). The quoted upper limits on the PD are at the 3σ level.
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