SN 2019ein

[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 (177.07 KiB) Viewed 10409 times

Robin

[Vincent Lecocq]

Hi,

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

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

Vincent

[Francois Teyssier]

Summary of your observations gathered in the database: http://www.astrosurf.com/aras/Aras_Data ... 019ein.htm
(Robin Leadbeater, Pascal Le Du, Etienne Bertrand, Christian Buil, Vincent Lecoq, Woody Sims)

sn2019ein.png (91.51 KiB) Viewed 10320 times

Congratulations!

[etienne bertrand]

Belle observation !

[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 (72.98 KiB) Viewed 10302 times

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

_sn2019ein_20190606_954_SNID.png (40.69 KiB) Viewed 10302 times

Robin