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

[Astronomy seminar announcements]

Reminder, Mike's talk is in half an hour in FC61 and on Zoom!

C

On 19/04/2022 09:17, Chris Usher wrote:
>
> 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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