Open Access
Table B.1
Assumptions in the simulation of the common-path OPD terms introduced in the line of sight.
| Parameter | Assumption | Description |
|---|---|---|
| Atmosphere | ||
| Tatm, 1 | 10°C | Turbulent-layer temperature along path 1 |
| Tatm, 2 | 15°C | Turbulent-layer temperature along path 2 |
| hatm, 1 | 10% | Turbulent-layer relative humidity along path 1 |
| hatm, 2 | 40% | Turbulent-layer relative humidity along path 2 |
| datm | 22 m | Median turbulent outer scale above Paranal (Martinez et al. 2010) |
| Delay lines | ||
| TDL, 1 | 14°C | Delay line temperature along path 1 |
| TDL, 2 | 16°C | Delay line temperature along path 2 |
| hDL, 1 | 15% | Delay line relative humidity along path 1 |
| hDL, 2 | 20% | Delay line relative humidity along path 2 |
| dDL | 200 m | Approximate longest path in the delay line tunnel |
| Δd | 113 m | Largest UT baseline (130 m) projected on a target with same azimuth and an altitude of 30° |
| Atmosphere & delay lines | ||
| P | 744 hPa | Mean atmospheric pressure at Paranal |
| [CO2] | 417 ppm | Mean CO2 concentration in the Earth’s atmosphere in 2022 |
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