30 replies to this topic

[mborland]

Robin,

 

Thanks for these links. There's a huge amount to learn about this subject, even apart from the process of recording and processing spectra.

 

It think I need to learn to use SNID since it seems to have more capabilities than GELATO.

 

--Michael

[robin_astro]

Yes SNID is significantly more sophisticated than GELATO and comes up with classifications in more difficult situations but even that is looking dated compared with DASH for example, though I have not tried that yet.

 

https://iopscience.i...538-4357/ab48f4

 

Cheers

Robin

[robin_astro]

Note that the Transient Name Server

https://www.wiserep.org/

is primarily for the confirmation and classification of transients like supernovae so normally only spectra that are used to classify or change the classification are uploaded there (Though I do sometimes upload my spectra taken around the same time or prior to the classification date.)

 

Follow up spectra  can however be uploaded to the sister WISeREP website which follows the same format as TNS

https://www.wiserep.org/

For example there are there are currently 110 spectra of SN 2023ixf in M101 

https://www.wiserep....a?&name=2023ixf

 

Cheers

Robin

Edited by robin_astro, 28 January 2024 - 09:05 AM.

[mborland]

I had a bit of time last night to get another spectrum of SN2024gy. This is a much shorter total exposure than the others, just 3x720s instead of typically 20x720s. It suggests a rather significant change in the spectrum over the last week or so.

 

 

--Michael

 

[robin_astro]

There is a nice animation showing the typical evolution of a type Ia supernova spectrum (and various other graphics and animations) here

https://people.lam.f...hics/index.html

 

Cheers

Robin

[mborland]

We finally got a break in the clouds and I took another spectrum of SN2024gy. The spectrum continues to change significantly on time scales of a week or two.

--Michael