  We present the discovery of an exoplanet transiting TOI-908 (TIC-350153977)
using data from TESS sectors 1, 12, 13, 27, 28 and 39. TOI-908 is a T = 10.7
mag G-dwarf ($T_{eff}$ = 5626 $\pm$ 61 K) solar-like star with a mass of 0.950
$\pm$ 0.010 $M_{\odot}$ and a radius of 1.028 $\pm$ 0.030 $R_{\odot}$. The
planet, TOI-908 b, is a 3.18 $\pm$ 0.16 $R_{\oplus}$ planet in a 3.18 day
orbit. Radial velocity measurements from HARPS reveal TOI-908 b has a mass of
approximately 16.1 $\pm$ 4.1 $M_{\oplus}$ , resulting in a bulk planetary
density of 2.7+0.2-0.4 g cm-3. TOI-908 b lies in a sparsely-populated region of
parameter space known as the Neptune desert. The planet likely began its life
as a sub-Saturn planet before it experienced significant photoevaporation due
to X-rays and extreme ultraviolet radiation from its host star, and is likely
to continue evaporating, losing a significant fraction of its residual envelope
mass.
