another potentially bright supernova 2020hvf in NGC 3643

Robin Leadbeater
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another potentially bright supernova 2020hvf in NGC 3643

Post by Robin Leadbeater »

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

This is another type Ia so although only ~mag 17 currently it should reach ~mag 12.5-13 based on the redshift distance

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
Posts: 1926
Joined: Mon Sep 26, 2011 4:41 pm
Contact:

Re: another potentially bright supernova 2020hvf in NGC 3643

Post by Robin Leadbeater »

This supernova is now much brighter (mag 14 on 2020-04-27).
sn2020hvf_guider_9x10s_annot.png
sn2020hvf_guider_9x10s_annot.png (221.8 KiB) Viewed 9534 times
Here is the spectrum with the ALPY200 but it is bright enough now for any low resolution spectrograph
Although it is officially classified as a type Ia it is peculiar and does not give a good match in either GELATO or SNID.

Image

Cheers
Robin
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sn2020hvf_20200427_902_Leadbeater.png
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LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
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Frederic Pastor
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Joined: Wed Jan 22, 2020 4:57 pm

Re: another potentially bright supernova 2020hvf in NGC 3643

Post by Frederic Pastor »

Hi Robin,

Many thanks for your alert and your are right: Sn bright enough now to get my Alpy out on this target. I estimate more a Mag between 13 and 14 but I haven't calculate it yet, by comparison with the bright star just beside.

Below my contribution, I tried to push further until one hour exposure:
Sn
Sn
rspec Sn2020hvf 08 05 2020.jpg (81.75 KiB) Viewed 9064 times
guidage
guidage
Cheers

Fred
Robin Leadbeater
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Re: another potentially bright supernova 2020hvf in NGC 3643

Post by Robin Leadbeater »

Hi Fred,

Nice spectrum ! According to the images in rochersterastronomy it had reached Vmag 12.7 last night so probably near maximum
http://www.rochesterastronomy.org/sn2020/sn2020hvf.html

I am still trying to understand why I could not get a good match for my spectrum in SNID or GELATO. Perhaps it was too young then. If you post your fits file somewhere, I can run it through SNID and see if it gives a match now (I now put a copy of all my spectra in the BAA database future security https://britastro.org/specdb/data.php )

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Frederic Pastor
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Joined: Wed Jan 22, 2020 4:57 pm

Re: another potentially bright supernova 2020hvf in NGC 3643

Post by Frederic Pastor »

Many thanks Robin.
At Mag 12.7, this explain why the catch wasn't that difficult !
And a perfect period to carry on 'shooting' this Supernova, if the weather is with us.
I have just sent to you my FITS file on your email adress. Hope this will help. Not yet registered on BAA database. Now I will try to better understand this peculiar spectra, as you mentioned it.
Cheers.
Fred
Robin Leadbeater
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Re: another potentially bright supernova 2020hvf in NGC 3643

Post by Robin Leadbeater »

Frederic Pastor wrote:Many thanks Robin.

I have just sent to you my FITS file on your email adress.
Cheers.
Fred
Thanks Fred,

SNID gives a good fit to your spectrum for several type Ia near maximum. Here is a typical one. (The supernova was very young when I measured it. Perhaps SNID/GELATO do not have enough examples of young supernovae to compare with)

Cheers
Robin
_sn2020hvf_20200508_852_fred_pastor_crop_comp0003_snidflux.png
_sn2020hvf_20200508_852_fred_pastor_crop_comp0003_snidflux.png (41.16 KiB) Viewed 8986 times
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
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Frederic Pastor
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Joined: Wed Jan 22, 2020 4:57 pm

Re: another potentially bright supernova 2020hvf in NGC 3643

Post by Frederic Pastor »

Hi Robin,

SNID fitting is very interesting, and encouraging. To complete your matching, I may add that the SN1995al also fit perfectly this young 2020hvf, confirming a phase of -2.2 days and the type Ia :
Sn1995al
Sn1995al
gelatoplot.png (61.01 KiB) Viewed 8857 times
I have filtered a bit my spectrum to get it more smooth. And tried to find some Calcium and Silicium lines, as a first approach of understanding. Wasn't that easy in such a turbulent object. Do not hesitate to give your opinion :D
sn filtered
sn filtered
Sn2020hvf wavelenght.jpg (91.33 KiB) Viewed 8857 times
Cheers,

Fred
David Boyd
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Re: another potentially bright supernova 2020hvf in NGC 3643

Post by David Boyd »

This spectrum of type 1a supernova SN2020hvf was taken with a LISA spectrograph (R~1100) on a C11 and has been calibrated in absolute flux using a V magnitude of V=12.67 measured concurrently with the spectrum using another scope. The spectrum has been smoothed with a Gaussian factor 2.5.
The blue-shifted location at 6118A of the prominent Si II 6355A absorption feature indicates an expansion velocity of ~11,200 km/s.
David
sn2020hvf_20200511_918_D_Boyd.png
sn2020hvf_20200511_918_D_Boyd.png (33.12 KiB) Viewed 8759 times
Alun Halsey
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Joined: Fri Jan 19, 2018 10:53 am

Re: another potentially bright supernova 2020hvf in NGC 3643

Post by Alun Halsey »

SN2020HvF.JPG
This is my very first attempt at capturing spectra of a supernova,this was taken on the night of 11/12th using ALPY 600,SX TRIUS 825 on a C9.25 with 6.3x reducer. 4x900sec calibrated using Ar/Neon lamp in calibration module. Also signed up to Gelato this evening and received this result of 100% type la

Alun
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LHires III + SX Trius pro 694,ALPY 600 + SX Trius pro 825,Star analyser 100,C9.25,Esprit 150 ED Apo, Evostar 72ED with Sol'Ex SHG. Mesu 200 Mk1
Forrest Sims
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Joined: Thu Feb 09, 2017 5:52 pm

Re: another potentially bright supernova 2020hvf in NGC 3643

Post by Forrest Sims »

Hi all,

Thanks Robin for the alert on this SN.

Here is what it looks like 2 days later. This spectrum includes (9) 600sec exposures while guiding with the target on the slit. (I did manage to simultaneously acquire narrowband filter data but have not had time to assemble an ensemble as it were to do the photometry and therefore flux calibrate this spectrum.)
Cheers
Woody Sims
sn2020hvf_20200513_176_Forrest Sims.png
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