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Table 1.
Comparison of instrument specifications with performance routinely observed on sky.
| Parameter | Specification | On-sky experience | Reference or comment |
|---|---|---|---|
| [Goal] | |||
| Driving specifications and goals | |||
| NIR contrast on bright targets | |||
| DBI contrast at 0.5″ for H < 8 | 13.25 [15.75] | Typical Δmag = 13.5 | Fig. 21 |
| Best Δmag = 15.0 | Vigan et al. (2015) | ||
| IFS contrast at 0.5″ for J < 8 | 15.00 [20.00] | Typical Δmag15 | Fig. 21, Appendix C |
| Best Δmag = 16.5 | Sect. 7.3; Vigan et al. (2015) | ||
| IFS spectral information | 0.95–1.35 μm | Ok | e.g., Zurlo et al. (2016), |
| or 0.95–1.65 μm | Samland et al. (2017), … | ||
| VIS polarimetric contrast | |||
| Contrast at 1″ in 4 h on I = 2.5 |  |
17 at 0.2″ | Sect. 6.3.7; Hunziker et al. (in prep.) |
| > 20 at 1″ | |||
| NIR survey capability on large samples | |||
| IRDIS+IFS simultaneity | Required | Used routinely | |
| AO ultimate performance | Up to R = 9 | Ok | Fig. 7 |
| AO robust operations | Up to R = 12 | Overdone: R = 14 | Fig. 7 |
| Throughput | > 15% | > 20% | Fig. 5 |
| Elevation | 5°–60° | Ok | |
| Additional observation capabilities without impact on driving specifications | |||
| Near-infrared | |||
| Imaging in various filters | Y to K, BB, NB | Ok | |
| Dual-polarimetry imaging contrast | 9.25 [11.3] at 0.1″ | 13.0 at 0.2″ | van Holstein et al. (2017), high-efficiency |
| 11.75 [14.25] at 0.5″ | 15.0 at 0.5″ | in J-band, but strong dependency on | |
| derotator orientation | |||
| Long-slit spectroscopy | LRS (R ∼ 50Y − Ks) | Ok | Fig. 23 |
| MRS (R ∼ 350Y − Ks) | Ok | Fig. 24; Hinkley et al. (2015) | |
| Visible | |||
| High-angular resolution imaging | NB to very BB | Ok | Sect. 6.3.2; Schmid et al. (2018) |
| High-contrast imaging | Best effort | > 6.5 at 0.1″ | Sect. 6.3.5 |
| (non-polarimetric) | |||
Notes. All contrast values are specified in magnitudes and at 5σ.
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