SN 2019ein

Re: SN 2019ein

Postby Robin Leadbeater » Wed May 22, 2019 5:04 pm

Now we have the time of maximum light we can see if this supernova really is unusual or not. Here is the actual position of my spectrum taken on 2019-05-12 on the SNID time, redshift plot, marked in blue (I have assumed the redshift is that of the host galaxy)

sn2019ein_SNID_redshift-age_actual_marked.png
sn2019ein_SNID_redshift-age_actual_marked.png (40.3 KiB) Viewed 3573 times


We can see that this is not typical of most type Ia (because the expansion velocity is higher than usual), but there are a few other similar supernovae. If we look at these in SNID we find they are sn2004dt, 1984A, 2002bo. Looking in the literature I found this reference.
https://ui.adsabs.harvard.edu/abs/2007A ... A/abstract
There is a plot of velocity of the Si II line in fig 6. I have plotted my result for 2019ein.

evolution_of_SN2004dt_THO_added.png
evolution_of_SN2004dt_THO_added.png (47.69 KiB) Viewed 3573 times


We can see that it is similar to sn2004dt,1984A and 2002bo, with a higher velocity than the other more typical Ia supernovae. We should be able to follow this supernova for a while longer so If you want to measure your velocities in the Si II line in your spectra, I can plot them on the same graph.

Cheers
Robin

Cheers
Robin
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Re: SN 2019ein

Postby Robin Leadbeater » Thu May 23, 2019 11:47 am

I have added the Si II velocity from my spectrum last night and the velocity at -10 days from ZTF/SPRAT in TNS. It seems to best match the curve for sn2002bo with a very high initial velocity and a steep decline, though it is still higher than a typical type Ia

Robin

evolution_of_SN2004dt_THO_ZTF_added.png
evolution_of_SN2004dt_THO_ZTF_added.png (56.5 KiB) Viewed 3559 times
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Re: SN 2019ein

Postby Pascal Le Du » Thu May 23, 2019 8:40 pm

Hello

Here is the last spectrum I observed on the night of May 21st :
Image

A comparison with my May 12 spectrum
Image

This spectrum seems to match what you say Robin
I also note a line in emission at 4916A

Pascal
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Re: SN 2019ein

Postby Robin Leadbeater » Thu May 23, 2019 10:48 pm

Hello Pascal,
Pascal Le Du wrote:I also note a line in emission at 4916A

Pascal


Yes I am seeing the same new feature

sn2019ein_20190522_933_leadbeater.png
sn2019ein_20190522_933_leadbeater.png (12.52 KiB) Viewed 3538 times


Cheers
Robin
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Re: SN 2019ein

Postby Olivier GARDE » Fri May 24, 2019 2:34 pm

Spectrum taken with a 1 meter telescope at Calern observatory with Pascal Le Dû, Bertrand Guégan, Pierre Dubreuil and Olivier Garde

6 x 600s exposures with a LISA and a 50 µm slit.

Image
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: SN 2019ein

Postby Forrest Sims » Fri May 24, 2019 5:21 pm

Hello Olivier and all,

Very nice spectrum Olivier! What resolution and RMS error did ISIS report when you processed this spectrum? This should be interesting to compare to the spectrum I took last night with my LISA using the 23 micron slit on my 00000.355 meter telescope at the famous Desert Celestial Observatory in Phoenix Arizona:) This was 9 600s exposures. I could not find any hot pixels or cosmic rays in the spectrum nor sky background to explain the emission peak at around 4602Å. I think I see maybe the same feature in your spectrum.

Woody
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Re: SN 2019ein

Postby Olivier GARDE » Fri May 24, 2019 7:40 pm

Hi Woody,

ISIS report a resolution about 540 and RMS calibration around 0,2 (I use an ATIK 414ex in bin 1x1 and a 50 µm slit because I have more than 5 meters focal length....)
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
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Re: SN 2019ein

Postby etienne bertrand » Fri May 24, 2019 10:02 pm

Superbes spectres !
Olivier ton spectre de SN à un sacré signal ! Par contre on dirait un spectre haute résolution, les raies d'absorption sont très étroites, ça vient de quoi ?
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Re: SN 2019ein

Postby Olivier GARDE » Sat May 25, 2019 12:48 pm

etienne bertrand wrote:Superbes spectres !
Olivier ton spectre de SN à un sacré signal ! Par contre on dirait un spectre haute résolution, les raies d'absorption sont très étroites, ça vient de quoi ?


Il n'y a rien de particulier dans le process de ces spectres, la seule différence vient de l'optique. Après j'ai passé pas mal de temps pour optimiser au mieux la mise au point du doublet interne du LISA et au bout du compte la résolution du LISA avec la fente de 50µm est d'environ 540.
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: SN 2019ein

Postby Robin Leadbeater » Wed May 29, 2019 8:01 pm

A spectrum from last night and the evolution over the past week.

sn2019ein_20190528_931_Leadbeater.png
sn2019ein_20190528_931_Leadbeater.png (61.02 KiB) Viewed 3411 times


It looks like the velocity in the Si II 6355 line has stopped falling. Similar to SN1984A for example

evolution_of_SN2004dt_THO_ZTF_added.png
evolution_of_SN2004dt_THO_ZTF_added.png (56.52 KiB) Viewed 3411 times


Robin
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