Impact of the 3D source geometry on time-delay measurements of lensed type-Ia supernovae

  title={Impact of the 3D source geometry on time-delay measurements of lensed type-Ia supernovae},
  author={Vivien Bonvin and Olga Tihhonova and M. Millon and James H. H. Chan and Elodie Savary and S. Huber and Fr{\'e}d{\'e}ric Courbin},
  journal={Astronomy \& Astrophysics},
It has recently been proposed that gravitationally lensed type-Ia supernovae can provide microlensing-free time-delay measurements provided that the measurement is taken during the achromatic expansion phase of the explosion and that color light curves are used rather than single-band light curves. If verified, this would provide both precise and accurate time-delay measurements, making lensed type-Ia supernovae a new golden standard for time-delay cosmography. However, the 3D geometry of the… 

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