Table 4
MATISSE L-band DITs where the thermal background noise matches the readout noise.
| L band | Low | Medium | High | High+ |
|---|---|---|---|---|
| 3.0 µm | 0.08 s | 3.60 s | 14.0 s | 232 s |
| 3.5 µm | 0.02 s | 0.90 s | 3.50 s | 58 s |
| 4.05 µm | 0.01 s | 0.45 s | 1.75 s | 29 s |
| GRA4MAT | 1 s | 10 s | 10 s | 10 s |
Notes. The DITs are taken from (Lopez et al. 2022) and given as a function of wavelength and spectral resolution. A comparison with the DITs currently offered with GRA4MAT shows that we are background limited in low and medium, partly in high, but not in high+. In high and high+, the DITs could be further increased to improve the S/N. However, constraints like dispersion-induced fringe jumps or the need to collect a few DITs per standard 1 min exposures, favour shorter DITs.
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