A new supernova found in NGC 5643 in Lupus was discovered by the BOSS team on 13/2/2013
I took a spectra of it on 16/2/2013 using my LISA spectrograph with a resolution of R = 800
It matches a type 1a supernova at maximum very closely. It demonstrates very broad blue shifted Si II absorption lines.
A V filter image with photometry overlays
B = 11.82
V = 11.82
R = 11.65
I = 11.67
5/3/2013
The weather has been perpetually cloudy since I took the spectra above. It finally cleared a bit on 5/3/12 and I obtained about 15 minutes of exposure of this SN between passing clouds. It was very windy and the SN was only on the slit for about 50% of the exposure due to the scope being buffeted by the wind. The resulting spectra is very noisy but it does demonstrate progression over the 3 weeks between the exposures.
sn2013aa_20130305_520_TBohlsen.fit
10/3/2013
The SN is now well past its maximum
B = 13.02
V = 12.42
R = 12.36
I = 12.59
The spectra matches a 19 day Type 1a SN
The change is very evident with this double graph.
15/3/2013
sn2013aa_20130315_511_TBohlsen.fit
16/3/13
Terry Bohlsen