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We report the discovery, by the Next Generation Transit Survey (NGTS), of twohot-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 independentlyverified by follow-up photometric observations with the SAAO 1.0-m and Eulertelescopes, and we report on the planetary parameters using HARPS, FEROS andCORALIE radial velocities. NGTS-8b has a mass, 0.93 +0.04 -0.03 MJ and aradius, 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 greaterdensity of 2.93 +0.53 -0.49 g cm-3. Statistically, the planetary parameters putboth objects in the regime where they would be expected to exhibit larger thanpredicted radii. However, we find that their radii are in agreement withpredictions by theoretical non-inflated models.

NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters