potentially bright supernova in NGC4636

potentially bright supernova in NGC4636

Postby Robin Leadbeater » Sun Jan 12, 2020 11:44 pm

https://wis-tns.weizmann.ac.il/object/2020ue

Discovered today at mag 15 by Koichi Itagaki and confirmed as a type Ia, this could reach brighter than mag 12 depending on the extinction in the host galaxy so potentially bright enough for medium resolution spectra in the coming days

Cheers
Robin
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Re: potentially bright supernova in NGC4636

Postby Robin Leadbeater » Thu Jan 16, 2020 11:51 am

I have had a request for spectra of SN 2020ue from Prof Subo Dong on behalf of the ASAS-SN team. He writes

"We've just analyzed the latest 2020ue images, and it is at about 14
mag and rising. It'd be very useful to take high-cadence spectra for
this object. We plan to take spectroscopic polarimetry observations
too."

Theoretically the brightness could increase to mag 12 (SN 1939A also a type Ia in the same galaxy reached 11.9)

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
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Re: potentially bright supernova in NGC4636

Postby Robin Leadbeater » Sat Jan 18, 2020 12:11 pm

Currently 12.8 as measured by Itagaki
https://www.flickr.com/photos/snimages/49401526653/
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Re: potentially bright supernova in NGC4636

Postby Robin Leadbeater » Sun Jan 19, 2020 11:03 pm

Currently mag 12.6 and still rising, heading to be the brightest for 5 years.

Here is a high SNR spectrum from last night using the ALPY600.

sn2020ue_20200119_100_Leadbeater.png
sn2020ue_20200119_100_Leadbeater.png (24.13 KiB) Viewed 117 times


which gives and excellent detailed match in SNID to several type Ia supernovae still a few days from maximum eg

sn2020ue_SNID_fit.png
sn2020ue_SNID_fit.png (36.46 KiB) Viewed 117 times


Cheers
Robin
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Re: potentially bright supernova in NGC4636

Postby etienne bertrand » Tue Jan 21, 2020 3:51 pm

Bravo Robin, exellent spectr !
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Re: potentially bright supernova in NGC4636

Postby James Foster » Tue Jan 21, 2020 9:07 pm

To: Robin,

Thanks for the heads-up on this SN! I barely had time to slap the Alpy600 on my scope after finishing a run with the LhiresIII on Be stars.
Seeing was also questionable (as well as my focus), but I was able to get 8 images before the sky got too bright to shoot any more.
Previous to shooting this object in NGC 4636, I took a quick shot of Denebola (A3V) for my image response curve and got this spectrum of SN2020ue:
Image
Very interesting spectrum and as previously mentioned, its probably before brightest light. I need to set my C-11/Photometry scope on this
object over the next 2 weeks to get BVRI calibrated magnitudes of this bright SN. As usual, (except for the telluric OII) all identified spectral
lines are (very) speculative!

James
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