SN H0pe

Summary

SN H0pe (pronounced: Supernova Hope) is a Type Ia supernova discovered in 2023, at a redshift of z=1.78. It is a supernova discovered in a gravitationally lensed subject system, being itself a triply lensed object. Its name, H0pe, comes from its proposed utility in determination of the Hubble Constant (H0) that would allow determination of H0 in the distant universe and compare it with local determinations; and hopefully resolve Hubble tension, the difference in such determinations with local Type Ia supernovae and those based on the very distant Cosmic Microwave Background. The supernova exploded when the universe was 3.5 billion years old, rather than at today's date of 13.8 billion years old. The supernova progenitor was a white dwarf star, the progenitor of all Type Ia supernovae. The gravitational lens is galaxy cluster PLCK G165.7+67.0 (at a redshift of z=0.35), which lensed the supernova and its host galaxy.