Table A.1.
SPHERE/IRDIS observations of the HD 100453 system
| Prog. ID | Date | Band | nDIT × tDITa | Wind speed |
|---|---|---|---|---|
| (s) | (m s−1) | |||
| 095.C-0389(A) | 2015 Apr 10 | K12 | 176 × 8 | 8.54 ± 0.36 |
| 095.C-0389(A)b | 2016 Jan 16 | K12 | 176 × 8 | 1.56 ± 0.78 |
| 095.C-0389(A)b | 2016 Jan 23 | K12 | 176 × 8 | 4.88 ± 0.19 |
| 0103.C-0847(A) | 2019 Apr 07 | K12 | 42 × 32 | 3.64 ± 0.19 |
| 0103.C-0847(A) | 2019 Apr 08 | K12 | 26 × 32 | 4.40 ± 0.33 |
Notes:
We do not use two observations in 2016 in this work because of their bad observing conditions that strongly affect the disk morphology. Before new coatings on the telescope spiders in 2017, SPHERE was affected by the low wind effect for wind speeds lower than 5 m s−1 (Milli et al. 2018). Such a low wind effect results in strong stellar-light leakage around the IWA and strong spider patterns (i.e., diffraction spikes). As a result, the spider patterns strongly alter the disk morphology, which prevents us from correctly measuring the locations of spiral arms.
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