We report here strong evidence for a sub-Saturn around EPICÂ 211945201 and confirm its planetary nature .
EPICÂ 211945201b was found to be a planetary candidate from K2 photometry in Campaigns 5 & 16 , transiting a bright star ( V _ { mag } = 10.15 , G0 spectral type ) in a 19.492 day orbit .
However , the photometric data combined with false positive probability calculations using VESPA was not sufficient to confirm the planetary scenario .
Here we present high-resolution spectroscopic follow-up of the target using the PARAS spectrograph ( 19 radial velocity observations ) over a time-baseline of 420 days .
We conclusively rule out the possibility of an eclipsing binary system and confirm the 2- \sigma detection of a sub-Saturn planet .
The confirmed planet has a radius of 6.12 \pm 0.1 ~ { } R _ { \oplus } , and a mass of 27 _ { -12.6 } ^ { +14 } Â M _ { \oplus } .
We also place an upper limit on the mass ( within the 3- \sigma confidence interval ) at 42Â M _ { \oplus } above the nominal value .
This results in the Saturn-like density of 0.65 _ { -0.30 } ^ { +0.34 } g cm ^ { -3 } .
Based on the mass and radius , we provide a preliminary model-dependent estimate that the heavy element content is 60-70 % of the total mass .
This detection is important as it adds to a sparse catalog of confirmed exoplanets with masses between 10-70 M _ { \earth } and radii between 4-8 R _ { \earth } , whose masses and radii are measured to a precision of 50 % or better ( only 23 including this work ) .