Table 2
Observation log of VLT/SPHERE.
| UT Date | Instrument | Mode | Filter | NDIT × DITa |  |
Δπa | ωa | Strehl | Airmass |
|---|---|---|---|---|---|---|---|---|---|
| (s) | (°) | (″) | @1.6 μm | ||||||
| 03-02-2015 | IRDIS | DBI | K1K2 | 4 × 16 | 26 | 17.5 | 0.58 | 0.85 | 1.39 |
| 03-02-2015 | IFS | Rλ = 30 | YH | 1 × 64 | 26 | ||||
| 02-05-2015 | IRDIS | DPI | J | 2 × 32 | 76c | – | 0.72 | 0.73 | 1.40 |
| 04-05-2015 | IFS | Rλ = 30 | YH | 4 × 64 | 13 | ||||
| 18-01-2016b | IRDIS | DBI | K1K2 | 5 × 64 | 19 | 28.4 | 1.56 | 0.61 | 1.39 |
| 18-01-2016b | IFS | Rλ = 30 | YH | 5 × 64 | 19 | ||||
| 31-05-2016 | IRDIS | DBI | K1K2 | 10 × 64 | 7 | 25.3 | 0.64 | 0.82 | 1.41 |
| 31-05-2016 | IFS | Rλ = 30 | YH | 10 × 64 | 7 | ||||
| 10-05-2017 | IRDIS | DBI | K1K2 | 10 × 64 | 12 | 36.6 | 0.89 | 0.85 | 1.39 |
| 10-05-2017 | IFS | Rλ = 30 | YH | 10 × 64 | 12 |
Notes. (a)NDIT refers to the number of integration per datacube, DIT to the integration time, Nexp to the number of datacubes, Δ π to the parallactic angle variation during the sequence and ω to the seeing conditions. (b)January 18th, 2016 observations suffered from low-wind effect as illustrated in the enlarged image of Fig. 2. (c)For DPI, we note that one HWP or polarimetric cycles is composed of four data cubes. Twenty cycles were obtained for HD 95086 leading to a total of 76 exposures as one poor-quality cycle was discarded.
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