"SNe Ia twins for life" towards a precise determination of H$_{0}$

Understand

Here we present an approach to the measurement of extragalactic distances using twin SNe Ia, taken from the early down to the nebular phase.The approach is purely empirical, although we can give a theoretical background on why the method is reliable.

• By studying those twins in galaxies where peculiar velocities are relatively unimportant, we can tackle the H$_{0}$ tension problem.
• Here we apply the method to the determination of the distances to NGC 7250 and NGC 2525, who hosted respectively SN 2013dy and SN 2018gv, twins of two different SNe Ia prototypes: SN 2013aa/SN 2017cbv and SN2011fe.
• From the study of the SN 2013aa and SN 2017cbv twin pair, by comparing it with SN 2011fe and applying the difference between the SN 2013aa/2017cbv and the SN 2011fe class, we find as well a good estimate of the distance to NGC 5643.