From WASP photometry and radial velocities SOPHIE we report the discovery of WASP-40b (HAT-P-27b), a 0.6 Mjup planet that transits its 12th magnitude parent star every 3.04 days. The host star is G-type endings or K-type beginnings and probably has a solar metallicity greater than ( [ Fe / H ] = 0.14 +/- 0.11 ). the planet’s mass and radius are typical of known hot Jupiters, thus adding another system for the apparent pot of transiting planets with periods about 3 to 4 days.

Our parameters match those of the recent HATNet announcement of the same planet, thus giving confidence in the techniques used. We present a possible indication of stellar activity in the host star.


Observations of WASP-40b

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