SN 2019ein

Re: SN 2019ein

Postby Christian Buil » Wed May 15, 2019 4:47 pm

A better SNR observation for the 14.850/05/2019:

Image

The feature near 3500 A seem real.

(Daniel c'est clair que UVEX est bien optimisé pour l'UV, c'est bien sur le but - faut noter que c'est un ensemble qui est optimisé, la transmission optique du spectrographe, mais aussi le détecteur, et on peut remarquer le bon comportement du CMOS à condition de bien l'utiliser).

Comparison of the 13 and 14 / 05 observations : no significant evolution

Image

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Re: SN 2019ein

Postby Forrest Sims » Wed May 15, 2019 5:50 pm

Here is my contribution on AT2019ein taking 9 600sec exposures using my Shelyak LISA with 23 micron slit. Amazingly, guiding was really good using the target star on the slit. I smoothed the data slightly using a filter value of 1.5.

Woody
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Re: SN 2019ein

Postby Vincent Lecocq » Wed May 15, 2019 8:11 pm

hello,

here's also my modest contribution to this event. Low resolution spectrum (Alpy600, CCD Atik 414 sur un Newton D=250 f/4) taken yesterday, with a very present moon (but clear skies heavenly !!),

Vincent
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Re: SN 2019ein

Postby Francois Teyssier » Wed May 15, 2019 10:50 pm

Congratulations!
I've opened a page in the base for this nice target
http://www.astrosurf.com/aras/Aras_DataBase/Supernovae/sn2019ein.htm
BTW, if someone could write a text with spectra for the information letter 2019-Q2 (by mid-july) if should be great!
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Re: SN 2019ein

Postby Robin Leadbeater » Thu May 16, 2019 10:26 am

My spectrum in the BAA database.
https://britastro.org/specdb/data_graph.php?obs_id=4370

Robin
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Re: SN 2019ein

Postby Robin Leadbeater » Thu May 16, 2019 10:49 am

Early spectra from TNS overlaid on my spectrum 20190512. Note the reduction in blue shift of the Si II line with time.

Cheers
Robin
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Re: SN 2019ein

Postby Robin Leadbeater » Thu May 16, 2019 1:10 pm

Hi Daniel

Daniel Dejean wrote:@ Robin, Yes... a few... :-) 2, 3 or 5... that is the question... By the way, and despite your early warning, I am very surprised by the fact the AAVSO group has been very late to react compared to previous objects of same magnitude. As far as I can see, there is only 2 data point available at present time : https://www.aavso.org/apps/webobs/resul ... SN+2019EIN .
May be I am making the right query. Any other explanation ?
To predict the date at maximum and the related magnitude I am trying to use a kind of best fitting curve based on actual measurement 10 to 15 days before max. An other method could be to directly estimate the max magnitude based on distance. However it is my understanding that more complex factor, like intersellar instection, could impact this magitude/distance relation. Any advise ?


Yes extinction affects the maximum brightness. We know what this is for our galaxy but the extinction in the host galaxy is unknown and must be measured from the spectrum. The continuum shape gives a clue (It is blue in this case so there is no obvious evidence of high extinction) but also the extinction can be measured from IS absorption lines (probably not at the resolution of our spectra though). Type Ia supernovae also actually vary a bit in absolute brightness (They are not perfect "candles". This is corrected for by measuring the rate of decline after maximum.

I know how fast the brightness drops after maximum varies between type Ia supernovae but I am not sure about the rate of rise before maximum. You might find these papers on sn2018oh interesting. This was also a type Ia discovered early (I officially classified it first :) ). There was a very good early light curve from Kepler and these papers show the fit to the rising light curve
https://arxiv.org/abs/1811.10061
https://arxiv.org/abs/1811.10056

Professionals use a software tool called SNooPY to model supernovae light curves but I have not tried it
http://ascl.net/1505.023

Cheers
Robin
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Re: SN 2019ein

Postby Vincent Lecocq » Thu May 16, 2019 8:08 pm

and here it is for yesterday's night ... still very present moon of course, but last chance of good weather for somedays ... .
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Re: SN 2019ein

Postby etienne bertrand » Tue May 21, 2019 8:51 am

Petite accalmie hier, j'ai pu faire le spectre de cette supernova :) .
La raie du SiII qui arrive à 6127.5A ce qui me donne un vitesse d'éjecta toutes vitesses réduites de - 13 045 km/s
On note toujours une vitesse assez élevée ~19 jours après sa découverte (1/05/2019).

Alpy600 - C8 + red x0.63 - poses de 900s x 8 - Atik414EX.
Image

Image

Image
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Re: SN 2019ein

Postby Robin Leadbeater » Wed May 22, 2019 1:13 pm

It looks like it reached maximum (in g mag) around 2019-05-15 (ASAS-SN light curve)
https://asas-sn.osu.edu/light_curves/07 ... 2d31ed2523
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