Galactic microlensing with rotating binaries
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