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$K2$'s Campaign 9 ($K2$C9) will conduct a $\sim$3.7 deg$^{2}$ survey towardthe Galactic bulge from 7/April through 1/July of 2016 that will leverage thespatial separation between $K2$ and the Earth to facilitate measurement of themicrolens parallax $\pi_{\rm E}$ for $\gtrsim$127 microlensing events. Thesewill include several that are planetary in nature as well as manyshort-timescale microlensing events, which are potentially indicative offree-floating planets (FFPs). These satellite parallax measurements will inturn allow for the direct measurement of the masses of and distances to thelensing systems. In this white paper we provide an overview of the $K2$C9space- and ground-based microlensing survey. Specifically, we detail thedemographic questions that can be addressed by this program, including thefrequency of FFPs and the Galactic distribution of exoplanets, theobservational parameters of $K2$C9, and the array of resources dedicated toconcurrent observations. Finally, we outline the avenues through which thelarger community can become involved, and generally encourage participation in$K2$C9, which constitutes an important pathfinding mission and communityexercise in anticipation of $WFIRST$.

publications of the astronomical society of the pacific

Campaign 9 of the $K2$ Mission: Observational Parameters, Scientific  Drivers, and Community Involvement for a Simultaneous Space- and Ground-based  Microlensing Survey