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SN2020uxz in NGC 514

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#26 robin_astro

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Posted 24 October 2020 - 05:50 PM

Hi Dave,

 

I did a quick rough reduction from your spectrum image and ran it through SNID. It confirms a good fit to several type Ia at or near maximum eg

 

Dave_sn2020uxz_snidfit.png

 

Cheers

Robin



#27 descott12

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Posted 24 October 2020 - 05:57 PM

Hi Dave,

 

I did a quick rough reduction from your spectrum image and ran it through SNID. It confirms a good fit to several type Ia at or near maximum eg

 

attachicon.gifDave_sn2020uxz_snidfit.png

 

Cheers

Robin

Well would you look at that! Beautiful. Thanks alot for taking the time to do that.

 

That is not bad for an SA-100, especially since it was mis-rotated by 3 degrees and it was such a short exposure. I am really surprised you were able to get such a nice curve out of the very dim and noisy spectrum.



#28 NJScope

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Posted 29 October 2020 - 11:50 AM

Sn2020uxz finally appears to be dimming based on a C-filter photometric value (13.967 ±0.018) obtained this morning.  Images (n=3) were heavily washed out due to the presence of Mars and the Moon so I am somewhat uncertain about this result.

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  • SN2020uxz_C-mag_FOV.jpg


#29 descott12

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Posted 29 October 2020 - 12:36 PM

Sn2020uxz finally appears to be dimming based on a C-filter photometric value (13.967 ±0.018) obtained this morning.  Images (n=3) were heavily washed out due to the presence of Mars and the Moon so I am somewhat uncertain about this result.

I agree. My last image from a few nights ago showed it to be dimmer than my previous but I was just eye-balling it and comparing to the surrounding stars.



#30 NJScope

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Posted 03 November 2020 - 11:24 AM

The clear filter magnitude estimate for SN2020uxz acquired early this morning (Nov 3.2104) was 14.30 ±0.01  indicating that this supernova has definitely begun to dim:

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  • SN2020uxz_Light Curve_v2.jpg


#31 ssmith

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Posted 03 November 2020 - 04:35 PM

Kevin -

 

Here is the AAVSO plot for SN2020uxz - My measurements are marked with the crosses.

 

You captured a slight rise just past the maximum while my measurements show a flattening.  The difference is probably just due to the slight difference in time between our measurements in capturing the rapid change in flux.  When I saw my measurement I thought perhaps I had made an error.  Its good to see that it was a real event. smile.gif

 

Light Curve SN 2020uxz 11-3-20.png


Edited by ssmith, 03 November 2020 - 04:36 PM.


#32 robin_astro

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Posted 05 November 2020 - 09:55 AM

Another spectrum from 20201103. Significant evolution from 20201015

https://britastro.or...s&legend_pos=ne

but still a good match to a type Ia.

 

_sn2020uxz_20201103_955_snidfit.png

 

SNID estimates now approximately 12-14 days post maximum so roughly in agreement with the photometry

 

Cheers

Robin


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#33 NJScope

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Posted 07 November 2020 - 10:43 AM

Robin/Steve:

 

Thanks for adding new information on SN2020uxz.  I managed to get a two additional clear filter estimates on 2020Nov 5.2042 (14.41 ±0.01) in AZ and 2020Nov7.0653 (14.50 ±0.03) in NJ:

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  • SN2020uxz_Light Curve_v3.jpg


#34 NJScope

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Posted 17 November 2020 - 01:18 PM

New clear filter data collected over the past week reveals a continual dimming of SN2020uxz.  It has dropped nearly 1.25 mags since maximum light (CV=13.62):

Attached Thumbnails

  • SN2020uxz_Light Curve_v4.jpg

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#35 Rich (RLTYS)

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Posted 24 November 2020 - 04:55 PM

Here's the latest AAVSO Lightcurve for fading SN2020uxz.

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  • Lightcurve 11-24-20.png

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#36 GaryShaw

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Posted 25 November 2020 - 10:17 AM

Rich, I’m curious about all the different plot point symbols. Some look like filter designations but I can’t figure out the others. Is there a legend for the legend somewhere at AAVSO?

 

thank you for this!

Gary



#37 Rich (RLTYS)

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Posted 25 November 2020 - 04:37 PM

Gary, there's a legend on the top of the diagram but your best bet is going to the AAVSO's Light Curve Generator. The orange crosses are my own observations.
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#38 robin_astro

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Posted 25 November 2020 - 05:53 PM

Here is a list of the codes for different passbands

 

https://www.aavso.or...1#comment-34331

 

plus visual of course

 

Cheers

Robin


Edited by robin_astro, 25 November 2020 - 05:54 PM.


#39 NJScope

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Posted 30 November 2020 - 03:16 PM

Getting reliable CV magnitude values has been a real challenge over the past week due to moonglow and the shadow cast from nearby Mars.   Here's the latest revision to the CV lightcurve with the addition of two points (n=3 each) taken with 180 sec exposures:

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  • SN2020uxz_Light Curve_v4.jpg

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#40 NJScope

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Posted 13 December 2020 - 11:57 AM

Sixty-eight days post discovery SN2020uxz (CV mag = 16.01 ±0.02) is slowly approaching its detection magnitude of 16.5:

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  • SN2020uxz_Light Curve_v7.jpg


#41 NJScope

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Posted 28 December 2020 - 01:10 PM

After 82.5 days, SN2020uxz has now dimmed to its discovery magnitude (CV=16.5).   All photometric data acquired at Desert Blooms Observatory have been uploaded into the AAVSO archives and are shown below in comparison to  V, CV and TG data produced by other observers:

Attached Thumbnails

  • Screenshot_2020-12-28 Enhanced LCG.png

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#42 Rich (RLTYS)

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Posted 29 December 2020 - 11:01 AM

A beautiful set of observations. waytogo.gif



#43 robin_astro

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Posted 02 January 2021 - 10:29 AM

A spectrum (modified ALPY 200 R~130) from last night at ~mag 16.5 under difficult bright moonlit conditions (The sky background was about 5x brighter than the spectrum !)  Despite the lack of signal, the spectrum clearly still matches other type Ia at similar age, for example SN 2002bo at 72 day past maximum (from SNID) in red, overlaid on SN 2020uxz (black)

 

Cheers

Robin

 

 

sn2020uxz_snidfit_2002bo.png


Edited by robin_astro, 02 January 2021 - 10:29 AM.

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#44 NJScope

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Posted 03 January 2021 - 02:19 PM

Robin:

 

Amazing job with getting a spectrum of SN2020uxz at mag 16.5! 



#45 robin_astro

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Posted 07 January 2021 - 06:49 PM

Robin:

 

Amazing job with getting a spectrum of SN2020uxz at mag 16.5! 

Thanks!

 

The moon was  the limiting factor in this case . In ideal conditions I have gone as faint as mag 18.  (I estimate ~2 photons/pixel/minute)

 

 SN_spectroscopy_limit.png


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