Degeneracies in triple gravitational microlensing

  title={Degeneracies in triple gravitational microlensing},
  author={Ying-Yi Song and Shude Mao and Jin H. An},
We study microlensing light curves by a triple lens, in particular, by a primary star plus two planets. A four-fold degeneracy is confirmed in the light curves, similar to the close and wide degeneracy found in a double lens. Furthermore, we derive a set of equations for triple-lens in the external shear approximation. By using these external shear equations, we identify two kinds of continuous degeneracies which may confused double and triple lenses, i.e. the continuous external shear… CONTINUE READING


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