The Identification of the Microlens in Event MACHO-LMC-20

Details The Identification of the Microlens in Event MACHO-LMC-20 The Identification of the Microlens in Event MACHO-LMC-20

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917222w&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #172.22; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on the identification of the lens responsible for microlensing event MACHO-LMC-20. As part of a Spitzer/IRAC program conducting mid-infrared follow-up of the MACHO Large Magellanic Cloud microlensing fields, we discovered a significant flux excess at the position of the source star for this event. These data, in combination with high resolution near-infrared Magellan/PANIC data, have allowed us to classify the lens as an early M dwarf in the thick disk of the Milky Way, at a distance of 2 kpc. This is only the second microlens to have been identified, the first, the lens of MACHO-LMC-5 (Nguyen et al, ApJS, v.154, p.266 {2004}) also being a M dwarf star in the disk. Together, these two events are still consistent with the expected frequency of nearby stars in the Milky Way thin and thick disks acting as lenses.
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This work is based [in part] on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech.

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