Table 1
Summary of the SPHERE/IRDIS observations of PDS 70 used in this work, sorted by date.
| Date | Strategy | Program | Filter | Coronagraph |  [sec] |
Number of frames(b) | Seeing(c) [″] | ΔPA(d) [°] |
|---|---|---|---|---|---|---|---|---|
| 2015-05-06 | ADI | 095.C−0298(A) | H23 | N_ALC_YJH_S | 64 | 16 | 1.25 | 36.0 |
| 2015-06-04 | ADI | 095.C−0298(B) | H23 | N_ALC_YJH_S | 64 | 16 | 1.33 | 40.0 |
| 2016-03-26 | PDI | 096.C−0333(A) | J | N_ALC_YJ_S | 64 | 35 | 1.83 | - |
| 2018-01-25 | ADI | 1100.C−0481(D) | K12 | N_ALC_YJH_S | 96 | 30 | 1.07 | 95.7 |
| 2019-03-11 | ADI | 1100.C−0481(L) | K12 | N_ALC_Ks | 96 | 16 | 0.7 | 49.0 |
| 2019-04-13 | ADI | 1100.C−0481(M) | K12 | N_ALC_YJ_S | 96 | 15 | 0.53 | 71.3 |
| 2019-07-13 | PDI | 1100.C−0481(T) | Ks | n/a | 64 | [66,69](e) | [0.9,0.69] | - |
| 2019-08-09 | PDI | 0102.C−0916(B) | H | N_ALC_YJH_S | 64 | 37 | 1.58 | - |
| 2021-07-16 | PDI | 60.A−9001(S) | H | [N_NS_CLEAR, N_ALC YJH_S] | 16 | [17,49](f) | [0.65,0.83] | - |
Notes.(a) Exposure time of OBJECT frames.(b) Number of frames in cubes.(c) Average seeing from ESO Astronomical Site Monitoring (ASM,, https://www.eso.org/asm/ui/publicLog).(d) Maximum parallactic angle variation.(e) Program split into two parts to improve image quality, due to the variation in observing conditions.(f) Program split into two parts, due to different coronagraph settings.
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