We report the discovery of a microlensing planet — MOA-2016-BLG-227Lb — with a large planet/host mass ratio of q \simeq 9 \times 10 ^ { -3 } .
This event was located near the K2 Campaign 9 field that was observed by a large number of telescopes .
As a result , the event was in the microlensing survey area of a number of these telescopes , and this enabled good coverage of the planetary light curve signal .
High angular resolution adaptive optics images from the Keck telescope reveal excess flux at the position of the source above the flux of the source star , as indicated by the light curve model .
This excess flux could be due to the lens star , but it could also be due to a companion to the source or lens star , or even an unrelated star .
We consider all these possibilities in a Bayesian analysis in the context of a standard Galactic model .
Our analysis indicates that it is unlikely that a large fraction of the excess flux comes from the lens , unless solar type stars are much more likely to host planets of this mass ratio than lower mass stars .
We recommend that a method similar to the one developed in this paper be used for other events with high angular resolution follow-up observations when the follow-up observations are insufficient to measure the lens-source relative proper motion .