[Astronomy seminar] Astronomy Department Seminar - April 22nd Mike Barlow

[Astronomy seminar announcements]

Hello

On Friday the 22nd of April at 10:30, Mike Barlow (UCL) will be giving 
our next seminar. This will be a hybrid seminar - you are welcome to 
either attend in person in FC61 or via Zoom. Mike will be visiting the 
department that Friday and we will be going for lunch with him after the 
seminar.

*Dust Formation by Supernovae*

The large quantities of dust found in a number of high redshift galaxies 
has led to suggestions that core-collapse supernovae (CCSNe) are the 
main sources of their dust and has motivated the measurement of the dust 
masses formed by local and extragalactic CCSNe. A widely used technique 
for CCSN dust mass determination, namely the fitting of their optical-IR 
spectral energy distributions, is restricted to warmer dust emitting 
shortwards of 30 microns by the lack of sufficiently sensitive 
facilities operating at longer wavelengths. However, an alternative 
technique for measuring total dust masses is available, one which is 
insensitive to dust temperature. This method relies on the spectral 
modelling of the red-blue asymmetries in late-epoch optical emission 
line profiles, produced by dust within the ejecta that selectively 
absorbs red-shifted photons emitted from the far side of the ejecta. 
After reviewing earlier work on CCSN dust masses, I will report on dust 
masses obtained from line profile fitting for a large VLT and Gemini 
spectral survey of extragalactic CCSNe, some observed at epochs up to 60 
years after outburst. Evidence will be presented for a slow growth in 
CCSN ejecta dust masses with time, taking approximately 30 years to 
saturate at a mean dust mass of 0.4 solar masses per CCSN.


Christopher Usher is inviting you to a scheduled Zoom meeting.

Topic: Astronomy Department Seminar
Time: Apr 22, 2022 10:30 AM Stockholm

Join Zoom Meeting
https://stockholmuniversity.zoom.us/j/69462418973

Meeting ID: 694 6241 8973
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