Probable SN in NGC 6946

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Re: Probable SN in NGC 6946

Postby Christian Buil » Sat Oct 14, 2017 9:54 pm

Excellent and scientific instructive observations of a faint target !

Christian
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Re: Probable SN in NGC 6946

Postby etienne bertrand » Sun Oct 15, 2017 3:05 pm

Super James, s'était aussi ma cible hier soir :) la voyant délaissée sur le forum.
La supernova n'est plus trop visible dans la caméra de guidage, pour la repérer il m'a fallut utiliser du binning 3x3 et poses de 10s. (magnitude ~16 / 16.5)

Sur le spectre elle est bien visible mais je suis passé à des poses de 2400s bin1x1
Il y a une grosse bosse vers 7300A qui apparait. A quoi est-elle due ?
Image

Evolution de la SN2017eaw
Image

Ha en absorption arrive à 6453.5A

Vitesse de l'éjecta = -5051km/s
Image
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Re: Probable SN in NGC 6946

Postby Robin Leadbeater » Sun Nov 26, 2017 9:26 pm

SN2017eaw is now V mag 16.3 according to this light curve
https://sites.google.com/view/sn2017eaw.
Here is an R~130 spectrum from last night using the ALPY200, (black) overlaid on a spectrum from GELATO of another IIP supernova at approximately the same age, SN2004et, which was interestingly in the same galaxy and was one of the first supernovae I ever measured, using a 100 l/mm grating (before the Star Analyser)

Cheers
Robin

sn2017eaw_20171125_GELATO.png
sn2017eaw_20171125_GELATO.png (40.75 KiB) Viewed 576 times
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
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Re: Probable SN in NGC 6946

Postby etienne bertrand » Wed Nov 29, 2017 1:16 pm

Bravo Robin !
Déjà qu'en Octobre elle n'était pas brillante, là c'est un exploit que de la faire !
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Re: Probable SN in NGC 6946

Postby James Foster » Thu May 24, 2018 10:33 pm

I know this is late, but I'm giving a general spectroscopy talk as the SAS meeting in Ontario California and decided to make an animation of AT2017eaw spectral observation 17May17-19Sep17:

Image

Visual Magnitudes were derived from David Bishop's "Recent Supernova" webpage seen here: http://www.rochesterastronomy.org/supernova.html

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