Table E.1
Photometry of the background object based on SPHERE/IRDIS observations.
| Band | λ (μm) | dλ (μm) | Contrast (×10−3) | Rel. app. mag. (mag) | App. mag. (mag) |
| J2 | 1.190 | 0.042 | 0.74 ± 0.04 | 7.82 ± 0.06 | 15.53 ± 0.07 |
| J3 | 1.273 | 0.046 | 0.96 ± 0.06 | 7.54 ± 0.34 | 15.25 ± 0.34 |
| H2(†) | 1.593 | 0.055 | 2.37 ± 0.09 | 6.56 ± 0.04 | 14.13 ± 0.05 |
| H3(†) | 1.667 | 0.056 | 2.64 ± 0.07 | 6.45 ± 0.15 | 14.01 ± 0.15 |
| H2(‡) | 1.593 | 0.055 | 2.46 ± 0.10 | 6.52 ± 0.05 | 14.09 ± 0.05 |
| H3(‡) | 1.667 | 0.056 | 2.83 ± 0.20 | 6.37 ± 0.23 | 13.94 ± 0.23 |
| BBH | 1.625 | 0.290 | 2.25 ± 0.10 | 6.62 ± 0.04 | 14.19 ± 0.05 |
Notes. The two last columns correspond to the relative apparent magnitude and the apparent magnitude. The magnitude of the host star used is 7.708 ± 0.026 mag in J2 and J3, and 7.568 ± 0.049 mag in H2, H3 and BBH filters (Cutri et al. 2003). Two SPHERE/IRDIS observations exist in H2 and H3, see Table A.1. The results based on the epoch 2016-04-05 are indicated with (†), those based on the epoch 2016-06-03 with (‡).
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