We report the detection of a Jupiter–mass planet in a 6.838 d orbit around the 1.28 M _ { \odot } subgiant HD 185269 .
The eccentricity of HD 185269b ( e = 0.30 ) is unusually large compared to other planets within 0.1 AU of their stars .
Photometric observations demonstrate that the star is constant to \pm 0.0001 mag on the radial velocity period , strengthening our interpretation of a planetary companion .
This planet was detected as part of our radial velocity survey of evolved stars located on the subgiant branch of the H–R diagram—also known as the Hertzsprung Gap .
These stars , which have masses between 1.2 and 2.5 M _ { \odot } , play an important role in the investigation of the frequency of extrasolar planets as a function of stellar mass .