SN 2018cow

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SN 2018cow

Postby Peter Somogyi » Sun Jun 24, 2018 1:29 pm

A very faint object:

My observation from last night - bluish featureless continuum:
sn2018cow.gif (18.61 KiB) Viewed 1104 times

Guide view (off slit guiding):
guide_sn2018cow.png (141.73 KiB) Viewed 1104 times

The peak where H-alpha should be doesn't seem to be hotpixel: it's 100A away, and when applying the background galaxy's redshift (4241 +/- 39 km/s), I can measure 6561.2A as its barycenter. So that may be from the galaxy.
The "W" shape (absorptions barycenters: 4912A, 4967A) should be also something real (SNR good enough in the green-blue), but none matching by any atel reports.
I will be interested in comparing our results and learn more, here is mine:
(9.24 KiB) Downloaded 50 times

Peter Somogyi
Posts: 350
Joined: Sun Jul 13, 2014 8:56 am

Re: SN 2018cow

Postby Robin Leadbeater » Mon Jun 25, 2018 9:20 am

Hi Peter,

Very interesting. This is certainly an odd object. (There are now 30 ATels on this !) I would have expect some clear features in the spectrum by now if it was a normal supernova. I ran it through SNID but it did not come up with any matches.

LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
Robin Leadbeater
Posts: 1122
Joined: Mon Sep 26, 2011 4:41 pm

Re: SN 2018cow

Postby Peter Somogyi » Wed Jun 27, 2018 5:49 pm

Thank you for the look, Robin!
ATEL#11776 also reports vanishing features on the next day (2018-06-24 21:22).
It would be nice to access those spectra as fits files, for a comparison.
Also curious how was the result (overlapping observation with mine) with the T60 at Club Mars.

Peter Somogyi
Posts: 350
Joined: Sun Jul 13, 2014 8:56 am

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