  We provide here tables of stellar limb-darkening coefficients (LDCs) for the
Ariel ESA M4 space mission. These tables include LDCs corresponding to
different wavelength bins and white bands for the NIRSpec, AIRS-Ch0 and
AIRS-Ch1 spectrographs, and those corresponding to the VISPhot, FGS1 and FGS2
photometers. The LDCs are calculated with the open-source software ExoTETHyS
for three complete grids of stellar atmosphere models obtained with the ATLAS9
and PHOENIX codes. The three model grids are complementary, as the PHOENIX code
adopts more modern input physics and spherical geometry, while the models
calculated with ATLAS9 cover wider ranges of stellar parameters. The LDCs
obtained from corresponding models in the ATLAS9 and PHOENIX grids are compared
in the main text. All together the models cover the following ranges in
effective temperature ($1\,500 \, K \le T_{\mbox{eff}} \le 50\,000 \, K$),
surface gravity (0.0 dex $\le \log{g} \le 6.0$ dex), and metallicity ($-5.0 \le
[M/H] \le 1.0$).
