  We report the discovery, by the Next Generation Transit Survey (NGTS), of two
hot-Jupiters NGTS-8b and NGTS-9b. These orbit a V = 13.68 K0V star (Teff = 5241
+/- 50 K) with a period of 2.49970 days, and a V = 12.80 F8V star (Teff = 6330
+/- 130 K) in 4.43527 days, respectively. The transits were independently
verified by follow-up photometric observations with the SAAO 1.0-m and Euler
telescopes, and we report on the planetary parameters using HARPS, FEROS and
CORALIE radial velocities. NGTS-8b has a mass, 0.93 +0.04 -0.03 MJ and a
radius, 1.09 +/- 0.03 RJ similar to Jupiter, resulting in a density of 0.89
+0.08 -0.07 g cm-3. This is in contrast to NGTS-9b, which has a mass of 2.90
+/- 0.17 MJ and a radius of 1.07 +/- 0.06 RJ , resulting in a much greater
density of 2.93 +0.53 -0.49 g cm-3. Statistically, the planetary parameters put
both objects in the regime where they would be expected to exhibit larger than
predicted radii. However, we find that their radii are in agreement with
predictions by theoretical non-inflated models.
