Table 1
List of coronagraphic nuller concepts.
| Coronagraph | Nf ibers | ∆λ | Working angle [λ/D] | Theory | Contrast Lab. | Sky | Throughput | Jitter sensitivity [λ/D] |
|---|---|---|---|---|---|---|---|---|
| VFN (l=1)1 | 1 | ≥30% | 0.9 | ∞ | 6 · 10−5 | 3 · 10−2 | 19% | 0.01 |
| VFN (l=2)1 | 1 | ≥ 30% | 1.3 | ∞ | 4 · 10−4 | – | 10% | 0.1 |
| PLN2 | 1 | ≥ 10% | 1 | 10−3 | 10−2 | – | 60% | n.a. |
| SCAR3603 | 6 | 20% | 2 | 3 · 10−5 | 2 · 10−4 | – | 23% | 0.15 |
| Ring apodizer4 | 6 | 30% | 2 | 2 · 10−5 | ≤ 10−4 | – | 30% | 0.1 |
| PIAAN (This work) | 6 | 30% | 2 | 7 · 10−7 | 3 · 10−5 | – | 72% | 0.18 |
Notes. The working angle is given for the maximum throughput of all concepts. The field of view is more or less 1 λ/D due to the mode size of the fibers. Contrasts are given as theoretical / measured. Throughput is only theoretical. The ring apodizer is similar to a SCAR360 that would consider a binary transmission mask.1 Ruane et al. (2018b); Echeverri et al. (2019a,b, 2023);2 Xin et al. (2022); Xin et al. (2024);3 Por & Haffert (2020); Haffert et al. (2020); 4Kühn et al. (2022); Restori et al. (2024).
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