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Paper: Spitzer/IRAC Observations of the Fields of Five LMC Microlensing Events
Volume: 357, The Spitzer Space Telescope: New Views of the Cosmos
Page: 70
Authors: Kallivayalil, N.; Patten, B.M.; Werner, M.W.; Alcock, C.; Nguyen, H.T.
Abstract: We have carried out photometry with Spitzer's Infrared Array Camera (IRAC) of five LMC microlensing events in order to look for infrared excesses that would signal that the lenses are dwarf stars that are too cool to have been detected with conventional telescopes thus far. In the case of MACHOLMC-5, the IRAC fluxes and colors clearly establish that the lens is a M5 dwarf. There is significant excess in the case of MACHO-LMC-4 as well, but with a detection only in 1 IRAC band, we cannot draw such a clear-cut conclusion for the nature of the candidate lens. For the other three events, we do not detect any infrared excesses. We discuss what these results mean for the microlensing population.
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