Spitzer/IRAC Observations of the Fields of Five LMC Microlensing Events

Details Spitzer/IRAC Observations of the Fields of Five LMC Microlensing Events Spitzer/IRAC Observations of the Fields of Five LMC Microlensing Events

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..357...70k&link_type=abstract

The Spitzer Space Telescope: New Views of the Cosmos ASP Conference Series, Volume 357, proceedings of the conference held 9-12

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Scientific paper

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 MACHO-LMC-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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