another potentially bright supernova 2020hvf in NGC 3643

Re: another potentially bright supernova 2020hvf in NGC 3643

Postby Frederic Pastor » Thu May 21, 2020 3:57 pm

Hi All,

Here is below my spectrum taken yesterday, 12 days after my first "shot". According to the calculation of PRISM, Sn2020hvf should have reached a mag of 12.88. And by comparison with the star just beside (Mag 13.19), Sn2020hvf should be more close than a Mag of 13.

According to Gelato, this spectrum fits well with a Sn1998bu after 9.5 days at Bmax; which is almost the same phase.

Also included, a comparison of my two spectrum.

cheers

Fred

Sn2020hvf publication Forum ARAS.jpg
sn2020hvf
Sn2020hvf publication Forum ARAS.jpg (76.97 KiB) Viewed 129 times


Sn2020hvf magnitude.jpg


gelatoplot (1).png
gelato
gelatoplot (1).png (62.75 KiB) Viewed 129 times


Sn2020hvf comparaison 8 mai 20 mai.jpg
Sn2020hvf comparaison 8 mai 20 mai.jpg (104.48 KiB) Viewed 129 times
Frederic Pastor
 
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Re: another potentially bright supernova 2020hvf in NGC 3643

Postby Daniel Dejean » Fri May 22, 2020 10:24 am

Bravo Frédéric,
Sans être un expert compétent, il me semble que l'on distingue une évolution entre tes deux spectres pour la "raie" du silicium SIII 4580 qui est maintenant plus proche (4380) de sa valeur au repos (ralentissement de la vitesse d'expansion ?). Vers 5050 on commence aussi à distinguer nettement ce qui pourrait être la "raie" du FeII 5169,
Très intéressant en tous les cas pour cette SN peu fréquentée.
Bon ciel.
Daniel Dejean
 
Posts: 101
Joined: Sun Sep 18, 2016 7:20 am

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