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SUMMARY:Supernova Siblings as Probes of Host Galaxy Systematics - Lisa Kel
 sey
DTSTART:20260211T131500Z
DTEND:20260211T134000Z
UID:TALK244618@talks.cam.ac.uk
CONTACT:Cristiano Longarini
DESCRIPTION:Type Ia supernovae (SNe Ia) are a cornerstone of modern cosmol
 ogy\, yet their use as standardisable candles is limited by an unresolved 
 dependence on their host galaxies: SNe Ia in high-mass galaxies are bright
 er than those in low-mass galaxies. This effect remains the dominant sourc
 e of uncertainty in supernova cosmology and may be driving the ongoing Hub
 ble Tension.\n\nIn this talk\, I will highlight how studies of supernova s
 iblings (multiple SNe Ia in the same host) provide a powerful way to isola
 te environmental effects. By comparing supernovae that share a common host
  but explode in different local environments\, siblings help disentangle g
 lobal and local drivers of SN Ia luminosity. I will present recent results
  from my sibling analyses and discuss how this approach will inform improv
 ed SN Ia standardisation in this new era of large transient surveys.
LOCATION:Hoyle Lecture theatre + Zoom 
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