Table 8.
Focal plane masks in the SPHERE visual coronagraph.
| Name | p | ρ | Remark | max(ct6n) | |
|---|---|---|---|---|---|
| (mas) | R_PRIM | I_PRIM | |||
| NC_WF | Clear | 7983 | 7813 | ||
| NC_NF | Clear | ||||
| CLC_S_WF | + | 46.5 | 72 | 52 | |
| CLC_M_WF | 77.5 | 26 | 13 | ||
| CLC_MT_WF | + | 77.5 | astrom. mask | ||
| CLC_L_WF | 155 | 31 | 11 | ||
| CLC_XL_WF | 538 | 7.5 | 2.7 | ||
| CLC_S_NF | + | 46.5 | Not tested | ||
| CLC_M_NF | 77.5 | Not tested | |||
| 4QPM1 | + | λ0 = 666 nm | |||
| 4QPM2 | + | λ0 = 823 nm | |||
| Bar | w = 155 mas | ||||
Notes. The first column gives the mask name where NC stands for no coronagraph, CLC for classical Lyot coronagraph, 4QPM for four quadrant phase mask, WF for wide field (radius ρ = 4″), NF for narrow field (1″×1″). Masks on plates p are indicated in the second column and ρ is the mask radius in μm and converted to mas using the scale 0.86 mas μm−1. The last two columns give the maximum normalized counts for the α Hyi tests (Fig. 16) for the R_PRIM and I_PRIM filters, respectively.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.