Bon Anniversaire SN2017eaw at mag 18 !

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Bon Anniversaire SN2017eaw at mag 18 !

Postby Robin Leadbeater » Sat May 26, 2018 10:06 am

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 682 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 682 times



Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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Re: Bon Anniversaire SN2017eaw at mag 18 !

Postby Francois Teyssier » Sat May 26, 2018 12:13 pm

Very impressive result on such a faint object.
Did you filter the spectrum?

Cheers,
François
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Re: Bon Anniversaire SN2017eaw at mag 18 !

Postby Robin Leadbeater » Sat May 26, 2018 2:49 pm

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 661 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
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
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Re: Bon Anniversaire SN2017eaw at mag 18 !

Postby Olivier GARDE » Sat May 26, 2018 4:11 pm

Hi Robin,

Mag. 18, great result !!!
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: Bon Anniversaire SN2017eaw at mag 18 !

Postby etienne bertrand » Tue May 29, 2018 8:25 am

Bonjour Robin,

Bravo pour le spectre c'est impressionnant !
etienne bertrand
 
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Re: Bon Anniversaire SN2017eaw at mag 18 !

Postby JP Nougayrede » Wed May 30, 2018 6:40 am

Mag 18, very impressive indeed !
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Re: Bon Anniversaire SN2017eaw at mag 18 !

Postby James Foster » Sat Jun 02, 2018 1:00 pm

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.
James R. Foster
Lhires III (2400 & 1800 ln/mm Grat) Spectroscope,
LISA Visual & IR Kit Spectroscope,
Alpy 600, and Star Analyzer 200
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