Table 1
Definition of the water absorption bands.
| Band name | Wavelength range (Å) | Instrument simulated | Adopted resolving power | Resolution element |
|---|---|---|---|---|
 |
6400–6800 | HARPS(-N) | 115 000  |
0.01 Å |
 |
7000–7400 | ESPRESSO | 134 000  |
0.01 Å |
 |
10 800–12 000 | GIANO-like | 50 000  |
λ∕50 000 |
 |
13 200–15 200 | GIANO-like | 50 000 | λ∕50 000 |
 |
18 000–19 800 | GIANO-like | 50 000 | λ∕50 000 |
Notes.Water absorption bands are named after the vibrational mode that determines their central frequency. Rotational fine structure broadens the absorption bands around this frequency. The vibrational number ν indicates stretching (a combination of symmetric and asymmetric; both have similar frequencies, thus all their combinations overlap when rotational fine structure is included) and δ indicates bending. With this naming, the strong water band observed with WFC3 G141 corresponds to the 
. We indicate the reference instrument for which we simulated a CCF for our analysis. In the last two columns, we indicate the resolving power and the resolution element of our simulated observations of each band. The simulated instruments are HARPS for the 
band; ESPRESSO for the 
band; for the NIR bands, we study the performance of an instrument of similar characteristics to GIANO.
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