Table 2
Results of the 
multiplicity test performed on the closure-phase for the first epoch of each target part of the calibration programme.
| Target | Alt. name | RA | Dec |  multiplicity test |
Contrast(†) | Vetted | ||
|---|---|---|---|---|---|---|---|---|
| Epoch | Primary | Secondary | Δmag (K) | |||||
| WDSJ04021-3429 | HD 25535 | 04:02:03 | −34:28:56 | Vetted in ExoGRAVITY LP | 2.6 | YES | ||
| WDSJ14077-1952 | HD 123227 | 14:07:42 | −49:52:03 | 0.6 | YES | |||
| WDSJ20399+1115 | HD 196885 | 20:39:52 | +11:14:59 | 3.2 | YES | |||
| WDSJ00209+1059 | HD 1663 | 00:20:55 | +10:58:38 | 2021-10-23 | 1.3 | 1.3 | 0.2 | YES |
| WDSJ00427-3828 | λ 01 Scl | 00:42:43 | −38:27:49 | 2021-10-21 | 1.3 | 1.3 | 0.3 | YES |
| WDSJ05055+1948 | HD 32642 | 05:05:32 | +19:48:24 | 2021-11-03 | 1.2 | 1.2 | 0.3 | YES |
| WDSJ05270-6837 | HD 36584 | 05:27:00 | −68:37:21 | 2020-12-01 | 1.8 | 1.5 | 0.3 | YES |
| WDSJ06345-1114 | HD 46716 | 06:34:32 | −11:13:47 | 2021-10-22 | 1.2 | 1.3 | 0.2 | YES |
| WDSJ06364+2717 | HD 46780 | 06:36:26 | +27:16:42 | 2020-12-17 | 1.6 | 1.6 | 0.7 | YES |
| WDSJ08394-3636 | HD 73900 | 08:39:22 | −36:36:24 | 2021-10-25 | 1.2 | 1.2 | 1.4 | YES |
| WDSJ10269+1713 | HD 90444 | 10:26:53 | +17:13:10 | 2022-02-06 | 1.4 | 1.3 | 0.3 | YES |
| WDSJ10361-2641 | HD 91881 | 10:36:05 | −26:40:32 | 2020-02-06 | 1.5 | 1.4 | 1.0 | YES |
| WDSJ18516-1719 | HD 174536 | 18:51:37 | −17:18:36 | 2023-03-30 | 1.6 | 1.7 | 3.5 | YES |
| WDSJ02407+2637 | HD 16638 | 02:40:42 | +26:37:20 | 2021-11-17 | 63.1 | 1.3 | – | NO |
| WDSJ05417-0254 | HD 37904 | 05:41:40 | −02:53:47 | 2020-12-01 | 2.0 | 7.8 | – | NO |
Notes. This test shows that both WDSJ02407+2637 and WDSJ05417-0254 (in grey) have higher multiplicities, making them unsuitable as binary calibrators.(†) For convenience, we also report an estimate of the contrast ratio for these targets, derived from our fits. Our observations were not designed for measuring the contrast, so these values should only be seen as rough estimates, and we do not report any error bars.
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