Table 1
Observations summary.
| Date | Obs. mode | texp (s) | Rot (°) | rC (mas) | ND filter | σ (′′) | τ0 (ms) | SR | 5σ @ 0.5′′ |
|---|---|---|---|---|---|---|---|---|---|
| May 3 2015 | IRDIFS_EXT | 3840 | 22.32 | 92.5 | No | 0.75 | 2.1 | 0.65 | 13.21 |
| May 29 2015 | IRDIFS | 6048 | 36.37 | 92.5 | No | 0.70 | 1.9 | 0.80 | 13.88 |
| Jan 17 2016 | IRDIFS_EXT | 4096 | 22.23 | 92.5 | No | 1.54 | 1.7 | 0.80 | 12.88 |
| Mar 26 2016 | IRDIFS_EXT | 4096 | 22.25 | 92.5 | No | 2.58 | 0.9 | 0.57 | 12.68 |
| Mar 31 2016 | IRDIS DPI J | 1280 | – | 92.5 | No | 1.98 | 0.93 | 0.85 | |
| Apr 16 2016 | IRDIFS_EXT | 4512 | 29.42 | No | 2.0 | 0.66 | 3.3 | 0.78 | 10.11 |
| May 25 2016 | IRDIS DPI K | 2304 | – | 92.5 | No | 0.75 | 5.10 | na | |
| May 31 2016 | IRDIFS_EXT | 4400 | 28.95 | 92.5 | No | 0.75 | 2.4 | 0.55 | 13.35 |
| Feb 7 2017 | IRDIFS_EXT | 5280 | 28.38 | No | 2.0 | 0.78 | 6.7 | 0.84 | 10.55 |
Notes. Date, SPHERE observing mode, total integration time (texp), total field rotation (Rot), coronagraph radius (rC), neutral density filter, average DIMM seeing FWHM on source in V band (σ), average coherence time τ0, and average Strehl ratio in H band (SR) coming from SPARTA data are presented. The deepest 5σ contrast limit reached at 0.5′′ with IFS after spectral ADI is also given to show the relative quality of the data sets.
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