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Re: SN 2019ein

PostPosted: Sat Jun 01, 2019 1:12 am
by Robin Leadbeater
Type Ia supernovae can be further classified using spectra at maximum light.
The "Branch" classification (Core Normal, Shallow Silicon, Broad Line, Cool) is based on the pseudo equivalent widths of the Si II 5972 and Si II 6355 lines. The pseudo EW and Velocity of the Si II 6355 line can also be used to identify normal and high velocity classes. Based on these systems SN2019ein is Broad Lined, High Velocity and SN2019np is Normal. (See positions overlaid on the graphs from "THE SPECTROSCOPIC DIVERSITY OF TYPE Ia SUPERNOVAE" Blondin et al )


Ia_Branch_Velocity_graphs_SN2019ein_SN2019np.png
Ia_Branch_Velocity_graphs_SN2019ein_SN2019np.png (177.07 KiB) Viewed 5255 times


Robin

Re: SN 2019ein

PostPosted: Sat Jun 01, 2019 8:24 pm
by Vincent Lecocq
Hi,

here's my last spectrum of SN2019ein, dated 26th may.

spectre_aras.png


The evolution from 14th may is impressive (spectra corrected from continuum), it's nice to follow such events ! The blue shift has effectively decreased ... .
comparaison.jpeg


Vincent

Re: SN 2019ein

PostPosted: Fri Jun 07, 2019 5:22 pm
by Francois Teyssier
Summary of your observations gathered in the database: http://www.astrosurf.com/aras/Aras_DataBase/Supernovae/sn2019ein.htm
(Robin Leadbeater, Pascal Le Du, Etienne Bertrand, Christian Buil, Vincent Lecoq, Woody Sims)
sn2019ein.png
sn2019ein.png (91.51 KiB) Viewed 5166 times



Congratulations!

Re: SN 2019ein

PostPosted: Fri Jun 07, 2019 10:54 pm
by etienne bertrand
Belle observation !

Re: SN 2019ein

PostPosted: Fri Jun 07, 2019 11:11 pm
by Robin Leadbeater
Another spectrum from last night (Taken in twilight. It does not get dark at all here now) The spectrum has evolved more over the last week.

sn2019ein_20190528_20190506_Leadbeater.png
sn2019ein_20190528_20190506_Leadbeater.png (72.98 KiB) Viewed 5148 times


Using SNID, it is a good match to normal type Ia at similar age (~22 days past maximum)

_sn2019ein_20190606_954_SNID.png
_sn2019ein_20190606_954_SNID.png (40.69 KiB) Viewed 5148 times


Robin