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Table 1.
Parameters for the used SPHERE/ZIMPOL polarimetric observation cycles of HD 169142.
| ncyc | cam1 | cam2 | Det | nDIT | DIT | ttot | Note |
|---|---|---|---|---|---|---|---|
| filt | filt | mode | (s) | (s) | |||
| 2015-07-09, seeing = 1.1″, τ0 = 1.5 | |||||||
| 1 − 4 | I′ | R′ | fast | 6 | 6 | 576 | |
| 5 − 8 | I′ | R′ | slow | 6 | 10 | 960 | sat. |
| 9 − 12 | I′ | R′ | fast | 4 | 6 | 384 | |
| 13 − 18 | R′ | I′ | slow | 4 | 10 | 960 | sat. |
| 19 − 22 | R′ | I′ | fast | 4 | 6 | 384 | |
| 23 − 26 | I′ | R′ | slow | 4 | 10 | 640 | sat. |
| 27 − 30 | I′ | R′ | fast | 4 | 6 | 384 | |
| 2015-07-10, seeing = 0.75″, τ0 = 2.1 | |||||||
| 1 − 14 | VBB | VBB | fast | 6 | 10 | 3360 | sat. |
| 2018-07-15, seeing = 0.51″, τ0 = 7.5, low wind effect | |||||||
| 1 − 15 | VBB | VBB | fast | 12 | 4.38 | 3153.6 | sat. |
Notes. Seeing and atmospheric coherence time τ0 are median values for the HD 169142 data of that night; det.mode: detector mode; ttot is ncyc × 4 × nDIT × DIT; sat: star saturated.
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