A Second Method to Photometrically Align Multi-Site Microlensing Light Curves: Source Color in Planetary Event MOA-2007-BLG-192
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Date
2010-02-20
Journal Title
Journal ISSN
Volume Title
Publisher
American Astronomical Society
Abstract
At present, microlensing light curves from different telescopes and filters are photometrically aligned by fitting
them to a common model.We present a second method based on photometry of common field stars. If two spectral
responses are similar (or the color of the source is known), then this technique can resolve important ambiguities
that frequently arise when predicting the future course of the event, and that occasionally persist even when the
event is over. Or, if the spectral responses are different, it can be used to derive the color of the source when that
is unknown. We present the essential elements of this technique and apply it to the case of MOA-2007-BLG-192,
an important planetary event for which the system may be a terrestrial planet orbiting a brown dwarf or very low
mass star. The refined estimate of the source color that we derive here V − I = 2.36 ± 0.03 will aid in making the
estimate of the lens mass more precise.
Description
Keywords
gravitational lensing: micro – methods: numerical – planetary systems, methods: numerical, planetary systems
Citation
Andrew Gould et al, "A Second Method to Photometrically Align Multi-Site Microlensing Light Curves: Source Color in Planetary Event MOA-2007-BLG-192," The Atrophysical Journal 710, no. 2 (2010), doi:10.1088/0004-637X/710/2/1800