We report the discovery of two new transiting planets from the WASP survey .
WASP-42 b is a 0.500 \pm 0.035 { M } _ { J } planet orbiting a K1 star at a separation of 0.0548 \pm 0.0017 AU with a period of 4.9816872 \pm 7.3 \times 10 ^ { -6 } days .
The radius of WASP-42 b is 1.080 \pm 0.057 { R } _ { J } while its equilibrium temperature is T _ { eq } = 995 \pm 34 K. We detect some evidence for a small but non-zero eccentricity of e = 0.060 \pm 0.013 .
WASP-49 b is a 0.378 \pm 0.027 { M } _ { J } planet around an old G6 star .
It has a period of 2.7817387 \pm 5.6 \times 10 ^ { -6 } days and a separation of 0.0379 \pm 0.0011 AU .
This planet is slightly bloated , having a radius of 1.115 \pm 0.047 { R } _ { J } and an equilibrium temperature of T _ { eq } = 1369 \pm 39 K. Both planets have been followed up photometrically , and in total we have obtained 5 full and one partial transit light curves of WASP-42 and 4 full and one partial light curves of WASP-49 using the Euler-Swiss , TRAPPIST and Faulkes South telescopes .