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Bon Anniversaire SN2017eaw at mag 18 !

Posted: Sat May 26, 2018 10:06 am
by Robin Leadbeater
SN2017eaw is a year old and has faded to Vmag 18
https://sites.google.com/view/sn2017eaw/sn2017-eaw

It is still measurable with the ALPY 200 though (My faintest spectrum so far) and shows some nice forbidden lines now it is in the nebular phase.
sn2017eaw_20180523_annot_3.png
sn2017eaw_20180523_annot_3.png (31.68 KiB) Viewed 6206 times
The spectrum still shows a good match to IIP supernova SN2004et at the same age which exploded in the same galaxy (ngc6946)
sn2017eaw_20180523_SNID.png
sn2017eaw_20180523_SNID.png (35.51 KiB) Viewed 6206 times

Cheers
Robin

Re: Bon Anniversaire SN2017eaw at mag 18 !

Posted: Sat May 26, 2018 12:13 pm
by Francois Teyssier
Very impressive result on such a faint object.
Did you filter the spectrum?

Cheers,
François

Re: Bon Anniversaire SN2017eaw at mag 18 !

Posted: Sat May 26, 2018 2:49 pm
by Robin Leadbeater
Hi Francois,

Yes The spectrum is slightly oversampled so I filtered it a bit to help the classification. It dropped the resolving power from 130 to ~90 so I probably overdid it a bit. The resolution is still high enough on these broad line spectra though.
sn2017eaw_20180523_978_filter_effect.png
sn2017eaw_20180523_978_filter_effect.png (34.54 KiB) Viewed 6185 times
Skies do not get completely dark here at this time of year so I was limited to 2 hours exposure and there was a first quarter moon so conditions were not perfect. I might be able to follow it a bit further yet.

Cheers
Robin

Re: Bon Anniversaire SN2017eaw at mag 18 !

Posted: Sat May 26, 2018 4:11 pm
by Olivier GARDE
Hi Robin,

Mag. 18, great result !!!

Re: Bon Anniversaire SN2017eaw at mag 18 !

Posted: Tue May 29, 2018 8:25 am
by etienne bertrand
Bonjour Robin,

Bravo pour le spectre c'est impressionnant !

Re: Bon Anniversaire SN2017eaw at mag 18 !

Posted: Wed May 30, 2018 6:40 am
by JP Nougayrede
Mag 18, very impressive indeed !

Re: Bon Anniversaire SN2017eaw at mag 18 !

Posted: Sat Jun 02, 2018 1:00 pm
by James Foster
To: Robin,

Thanks for the update! I will continue my photometry of this object for the next couple of weeks.....lucky my C-11 can just reach this in for IVB photometry!
I will also take this from my dark/high altitude site next week where I should easily get to this magnitude range.

James

p.s. I'm giving a talk at SAS on 16Jun18 and one of the slides I use is an animation for 4 months of LISA data and I'll mention your continued spectral observation.