Table 2
Parameters for the used SPHERE/ZIMPOL polarimetric observation cycles of ε Eridani.
| N | Date | DIT [s] | ncyc (usable) | texp (usable) | Seeing [″] | τ0 [ms] | Field rotation [°] | Note |
|---|---|---|---|---|---|---|---|---|
| 1 | 2019-10-10 | 3 | 48 (39) | 3h 12min (2h 36min) | 0.71 [0.52, 1.45] | 5.6 [3.2,11.1] | 118 | rd1 |
| 2 | 2019-10-11 | 3 | 48 (35) | 3h 13min (2h 20min) | 0.63 [0.43, 1.54] | 7.4 [3.6,13.6] | 92 | rd1, lw2 |
| 3 | 2019-11-30 | 5 | 44 (41) | 2h 56min (2h 44min) | 0.70 [0.41, 1.0] | 4.5 [2,8.8] | 127 | rd1 |
| 4 | 2019-12-01 | 5 | 46 (43) | 3h 4min (2h 52min) | 0.76 [0.52, 1.2] | 5.5 [3.4, 8.1] | 131 | rd1 |
| 5 | 2019-12-02 | 5 | 42 (37) | 2h 50min (2h 28min) | 1.12 [0.59, 2.02] | 2.5 [1.5, 5.9] | 137 | rd1 |
| 6 | 2019-12-03 | 5 | 48 (47) | 3h 12min (3h 8min) | 0.66 [0.45, 0.95] | 6.1 [3.6,9.2] | 136 | rd1 |
| 7 | 2020-01-12 | 5 | 37 (36) | 2h 28min (2h 24min) | 0.92 [0.59, 2.41] | 4.6 [2.2, 6.8] | 34 | rd1 |
| 8 | 2020-01-13 | 5 | 39 (39) | 2h 36min | 0.86 [0.62, 1.35] | 4.3 [2.1, 8.5] | 44 | rd1 |
| 9 | 2020-01-14 | 5 | 39 (39) | 2h 36min | 0.65 [0.42, 0.86] | 7.7 [4.1, 11.8] | 48 | |
| 10 | 2020-11-23 | 5 | 89 (82) | 5h 58min (5h 28min) | 0.49 [0.32, 1.3] | 5.8 [2.9, 11.5] | 148 | |
| 11 | 2020-11-24 | 5 | 79 (72) | 5h 19min (4h 48min) | 0.65 [0.37, 1.09] | 6.5 [2.8, 11.4] | 142 | |
| 12 | 2020-11-25 | 5 | 73 (68) | 4h 53min (4h 32min) | 0.99 [0.71, 1.6] | 4.1 [2, 6.8] | 145 |
Notes. Seeing and atmospheric coherence time τ0 are median and [min, max] values for the ε Eridani data of that night (N); all observations taken in fast polarization detector mode and VBB filter for both ZIMPOL cameras; texp is ncyc × 4 × nDIT × DIT; rd1: readout electronic issue camera 1; lw2: low wind effect. 38 h 32 min is total usable time of the coronagraphic cycles. Epochs of consecutive days are grouped with small skips.
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