SN 2021aefx in NGC1566 (Dorado)

Robin Leadbeater
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SN 2021aefx in NGC1566 (Dorado)

Post by Robin Leadbeater »

https://www.wis-tns.org/object/2021aefx
A supernova in a nearby galaxy for southerly observers to keep an eye on. Caught early so currently quite faint. The sub type is unclear from the initial spectrum but in the absence of IS extinction a type Ia could potentially reach as bright as mag 11 if the distance (10 Mpc but with high uncertainty) in NED is correct.

Cheers
Robin

EDIT: a good target for 2SPOT perhaps ?
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
2SPOT
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Re: SN 2021aefx in NGC1566 (Dorado)

Post by 2SPOT »

Yes Robin, we did it this morning : RC 12 inch and Alpy 600 from Deep Sky Chile

Here's the Sn in NGC 1566
Image


And the spectrum

Image
2SPOT : Southern Spectroscopic Project Observatory Team
Website : http://www.2spot.org - Observatory Site : Deep Sky Chile https://www.deepskychile.com/fr/
Suport our action : https://www.helloasso.com/associations/ ... mulaires/2
Robin Leadbeater
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Re: SN 2021aefx in NGC1566 (Dorado)

Post by Robin Leadbeater »

Nice catch! So it is confirmed as a Ia, Do you have an estimate of the brightness? The spectrum does not look obviously reddened so it could be heading for being the brightest SN for some time

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
2SPOT
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Re: SN 2021aefx in NGC1566 (Dorado)

Post by 2SPOT »

Hi Robin,

I think the Sn is around mag. V=15,5

Here's a quick comparison with others stars in the field

Image
2SPOT : Southern Spectroscopic Project Observatory Team
Website : http://www.2spot.org - Observatory Site : Deep Sky Chile https://www.deepskychile.com/fr/
Suport our action : https://www.helloasso.com/associations/ ... mulaires/2
Hamish Barker
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Re: SN 2021aefx in NGC1566 (Dorado)

Post by Hamish Barker »

great work, such a nice composition too with the big spiral galaxy!
Robin Leadbeater
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Re: SN 2021aefx in NGC1566 (Dorado)

Post by Robin Leadbeater »

Still rising rapidly in the ASAS-SN forced photometry data (Latest Mag 13.6 but that is likely an over estimate given contamination from the galaxy)
https://asas-sn.osu.edu/sky-patrol/coor ... d7d7314ceb

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Terry Bohlsen
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Re: SN 2021aefx in NGC1566 (Dorado)

Post by Terry Bohlsen »

Hi All
I took a spectrum of this SN last night with my LISA. R=~1600
Cheers
Terry
sn2021aefx_20211116_436_TBohlsen.png
Terry Bohlsen
Armidale NSW
Australia
Robin Leadbeater
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Re: SN 2021aefx in NGC1566 (Dorado)

Post by Robin Leadbeater »

There is an image using SLOOH from last night on the BAA forum where it looks to be ~mag 13.5
https://britastro.org/comment/11199#comment-11199
and running the 2SPOT spectrum through SNID, it estimates it was ~10-12 days away from maximum then so maximum around 25th. Plenty of time for it to get a lot brighter yet.
SN2021aefx_SNIDFIT_2SPOT_20211114.png
SN2021aefx_SNIDFIT_2SPOT_20211114.png (48.25 KiB) Viewed 7847 times
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: SN 2021aefx in NGC1566 (Dorado)

Post by Robin Leadbeater »

It has now reached maximum at mag 12 (g)

https://asas-sn.osu.edu/sky-patrol/coor ... 19daf1e0b5

Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
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2SPOT
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Re: SN 2021aefx in NGC1566 (Dorado)

Post by 2SPOT »

Last spectrum of this Sn taken this morning.

Image

And comparison with our spectrum taken November 14th

Image
2SPOT : Southern Spectroscopic Project Observatory Team
Website : http://www.2spot.org - Observatory Site : Deep Sky Chile https://www.deepskychile.com/fr/
Suport our action : https://www.helloasso.com/associations/ ... mulaires/2
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