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SUMMARY:Modelling the impact of host galaxy dust on type Ia supernova dist
 ance measurements - Brodie Popovic
DTSTART:20240605T124000Z
DTEND:20240605T130500Z
UID:TALK217585@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:Type Ia Supernovae (SNe Ia) are a critical tool in measuring t
 he accelerating expansion of the universe. Recent efforts to improve these
  standard candles have focused on incorporating the effects of dust on dis
 tance measurements with SNe Ia. In this paper\, we use the state-of-the-ar
 t Dark Energy Survey 5 year sample to evaluate two different families of d
 ust models: empirical extinction models derived from SNe Ia data\, and phy
 sical attenuation models from the spectra of galaxies. These empirically-d
 erived extinction distributions are highly incompatible with the physical 
 attenuation models from galactic spectral measurements. From these results
 \, we conclude that SNe Ia must either preferentially select extreme ends 
 of galactic dust distributions\, or that the characterisation of dust alon
 g the SNe Ia line-of-sight is incompatible with that of galactic dust dist
 ributions. Additionally\, we check the evolution of dust parameters with r
 edshift\, and find strong evidence that the environments of type Ia supern
 ovae change with redshift.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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