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Astron. Astrophys. 329, 361-374 (1998)

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Galactic microlensing with rotating binaries

M. Dominik

Institut für Physik, Universität Dortmund, D-44221 Dortmund, Germany

Received 11 February 1997 / Accepted 5 August 1997


The influence of rotating binary systems on the light curves of galactic microlensing events is studied. Three different rotating binary systems are discussed: a rotating binary lens, a rotating binary source, and the earth's motion around the sun (parallax effect). The most dramatic effects arise from the motion of a binary lens because of the changes of the caustic structure with time. I discuss when the treatment of a microlensing event with a static binary model is appropriate. It is shown that additional constraints on the unknown physical quantities of the lens system arise from a fit with a rotating binary lens as well as from the earth-around-sun motion. For the DUO#2 event, a fit with a rotating binary lens is presented.

Key words: gravitational lensing – dark matter – binaries: general – stars: low-mass, brown dwarfs – planetary systems

© European Southern Observatory (ESO) 1998

Online publication: November 24, 1997