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Henderson, Calen B.,Poleski, Radosław,Penny, Matthew,Street, Rachel A.,Bennett, David P.,Hogg, David W.,Gaudi, B. Scott,Zhu, W.,Barclay, T.,Barentsen, G.,Howell, S. B.,Mullally, F.,Udalski, A.,Szyma Astronomical Society of the Pacific 2016 Publications of the Astronomical Society of the Pa Vol.128 No.970
<P>K2's Campaign 9 (K2C9) will conduct a similar to 3.7 deg(2) survey toward the Galactic bulge from 2016 April 22 through July 2 that will leverage the spatial separation between K2 and the Earth to facilitate measurement of the microlens parallax pi(E) for greater than or similar to 170 microlensing events. These will include several that are planetary in nature as well as many short-timescale microlensing events, which are potentially indicative of free-floating planets (FFPs). These satellite parallax measurements will in turn allow for the direct measurement of the masses of and distances to the lensing systems. In this article we provide an overview of the K2C9 space-and ground-based microlensing survey. Specifically, we detail the demographic questions that can be addressed by this program, including the frequency of FFPs and the Galactic distribution of exoplanets, the observational parameters of K2C9, and the array of resources dedicated to concurrent observations. Finally, we outline the avenues through which the larger community can become involved, and generally encourage participation in K2C9, which constitutes an important pathfinding mission and community exercise in anticipation of WFIRST.</P>
OPTIMAL SURVEY STRATEGIES AND PREDICTED PLANET YIELDS FOR THE KOREAN MICROLENSING TELESCOPE NETWORK
Henderson, Calen B.,Gaudi, B. Scott,Han, Cheongho,Skowron, Jan,Penny, Matthew T.,Nataf, David,Gould, Andrew P. IOP Publishing 2014 The Astrophysical journal Vol.794 No.1
<P>The Korean Microlensing Telescope Network (KMTNet) will consist of three 1.6 m telescopes each with a 4 deg(2) field of view (FoV) and will be dedicated to monitoring the Galactic Bulge to detect exoplanets via gravitational microlensing. KMTNet's combination of aperture size, FoV, cadence, and longitudinal coverage will provide a unique opportunity to probe exoplanet demographics in an unbiased way. Here we present simulations that optimize the observing strategy for and predict the planetary yields of KMTNet. We find preferences for four target fields located in the central Bulge and an exposure time of t(exp) = 120 s, leading to the detection of similar to 2200 microlensing events per year. We estimate the planet detection rates for planets with mass and separation across the ranges 0.1 <= M-p/M-circle plus <= 1000 and 0.4 <= a/AU <= 16, respectively. Normalizing these rates to the cool-planet mass function of Cassan et al., we predict KMTNet will be approximately uniformly sensitive to planets with mass 5 <= M-p/M-circle plus <= 1000 and will detect similar to 20 planets per year per dex in mass across that range. For lower-mass planets with mass 0.1 <= M-p/M-circle plus < 5, we predict KMTNet will detect similar to 10 planets per year. We also compute the yields KMTNet will obtain for free-floating planets (FFPs) and predict KMTNet will detect similar to 1 Earth-mass FFP per year, assuming an underlying population of one such planet per star in the Galaxy. Lastly, we investigate the dependence of these detection rates on the number of observatories, the photometric precision limit, and optimistic assumptions regarding seeing, throughput, and flux measurement uncertainties.</P>