Description
Strong gravitationally lensed supernovae (glSNe) are a powerful tool for cosmology and astrophysics. By measuring the time delays between the multiple images of a lensed supernova, we can derive the Hubble constant—provided we have an accurate model of the lensing galaxy’s gravitational potential. The presence of a lensed host galaxy is crucial for accurately modelling this potential. In this talk I will discuss the connection between discoverable lensed transients and their host galaxies. I will demonstrate that glSN systems occurring in detectable lenses tend to exhibit longer time delays, making them ideal candidates for time-delay cosmography. I will also show that LSST will discover 20 glSNe per year in systems that could have been identified by Euclid as galaxy-galaxy lenses prior to the glSN discovery. This underscores that monitoring galaxy-scale lenses discovered with space-based facilities is a promising strategy to search for lensed supernovae. Additionally, I will highlight other current efforts in the area of lensed transient searches in preparation for the first LSST alerts.
