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SUMMARY:Unveiling the Intrinsic Mass Step of Type Ia Supernovae - Matt Gra
 yling (IoA)
DTSTART:20250321T113000Z
DTEND:20250321T123000Z
UID:TALK226561@talks.cam.ac.uk
CONTACT:Sandro Tacchella
DESCRIPTION:It has long been established that the properties of type Ia su
 pernovae (SNe Ia) depend on their local environment\, even after typical s
 tandardisation methods. This is typically referred to as the mass step\, w
 here SNe Ia in high-mass galaxies are on average brighter than their low-m
 ass counterparts post-standardisation\, although trends have been establis
 hed with other environmental properties including colour\, specific star f
 ormation rate and distance from the centre of the galaxy. There has been o
 ngoing debate in the field about whether these differences are intrinsic o
 r just the result of extrinsic effects i.e. dust. I will present recent an
 alysis of the environmental dependence of SNe Ia which have found an intri
 nsic contribution to the mass step\, with particularly strong differences 
 around the i-band secondary maximum. These results demonstrate that there 
 are intrinsic differences between SNe Ia in different environments and rai
 se an interesting question about what is driving these results\; understan
 ding this finding can help reveal the underlying physical cause of the env
 ironmental dependence of SNe Ia.\n
LOCATION:Ryle Seminar Room\, KICC + online
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