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Finite source sizes and the information content of macho-type lens search light curves
Nemiroff, Robert J.; Wickramasinghe, W. A. D. T.
AA(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AB(NASA. Goddard Space Flight Center, Greenbelt, MD, US)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 424, no. 1, p. L21-L23 (ApJL Homepage)
Publication Date:
NASA/STI Keywords:
Brown Dwarf Stars, Dark Matter, Gravitational Lenses, Halos, Light Curve, Modulation, Supernovae, Angular Velocity, Charge Coupled Devices, Orbits, Space Density, Stellar Mass
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If the dark halo matter is primarily composed of Massive Compact Halo Objects (MACHOs) toward the lower end of the possible detection range (less than 10-3 solar mass) a fraction of the lens detection events should involve the lens crossing directly in front of the disk of the background star. Previously, Nemiroff has shown that each crossing would create an inflection point in the light curve of the MACHO event. Such inflection points would allow a measure of the time it took for the lens to cross the stellar disk. Given an independent estimate of the stellar radius by other methods, one could then obtain a more accurate estimate of the velocity of the lens. This velocity could then, in turn, be used to obtain a more accurate estimate of the mass range for the MACHO or disk star doing the lensing.

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