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SN 2019vxm - a bright IIn supernova in a faint galaxy

PostPosted: Thu Dec 05, 2019 9:53 pm
by Robin Leadbeater
I have confirmed and classified ASASSN-19acc as a type IIn supernova (SN 2019vxm) using my ALPY 200 spectrograph (The 31st TNS classification using this equipment)

http://www.astronomerstelegram.org/?read=13326

https://wis-tns.weizmann.ac.il/object/2019vxm

It was mag 15.6 (g) measured from the guider image when the spectrum was taken but the nearby presumed host galaxy is rather faint and until now of unknown redshift. The redshift measured from the spectrum is 0.019

The early rise was in the field of the TESS satellite so it will have a detailed light curve.

Cheers

Robin

Re: SN 2019vxm - a bright IIn supernova in a faint galaxy

PostPosted: Thu Dec 05, 2019 11:50 pm
by Hamish Barker
Great work robin! Perhaps he "alpy 200" should be a standard production variant.

Re: SN 2019vxm - a bright IIn supernova in a faint galaxy

PostPosted: Fri Dec 06, 2019 8:54 pm
by Robin Leadbeater
This supernova is now reported to have brightened to mag 14.4 (R, clear)
https://britastro.org/comment/7485#comment-7485
If the redshift based distance (~80Mpc) is correct, mag 14.4 works out at an impressive absolute magnitude of -20.2 , thought to be boosted by interaction with circumstellar material in the case of type IIn

Robin