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In its Campaign 9, K2 observed dense regions toward the Galactic bulge inorder to constrain the microlensing parallaxes and probe for free-floatingplanets. Photometric reduction of the \emph{K2} bulge data poses a significantchallenge due to a combination of the very high stellar density, large pixelsof the Kepler camera, and the pointing drift of the spacecraft. Here we presenta new method to extract K2 photometry in dense stellar regions. We extended theCausal Pixel Model developed for less-crowded fields, first by using the pixelresponse function together with accurate astrometric grids, second by combiningsignals from a few pixels, and third by simultaneously fitting for anastrophysical model. We tested the method on two microlensing events and along-period eclipsing binary. The extracted K2 photometry is an order ofmagnitude more precise than the photometry from other method.

Photometry of K2 Campaign 9 bulge data