Hi Terry
Great work as usual.I was told that it was very featurless by the pros that is why thay had to wait for a few days before deciding on a type IIL
Here is Dans comments you may understand this more than me
report that low-dispersion spectra (range 320-900 nm) obtained on April 25.0, 25.9, 27.9, and 30.0 UT with the 10-m SALT telescope (+ RSS) of PSN J16590243-6011418 = 2013xx show it to be a young and luminous type-II supernova. All spectra are dominated by a strong blue continuum and weak yet broad P-Cyg absorptions associated with H Balmer, Na I, Fe II and potentially Si II lines that have been slowly increasing in strength between epochs. After correcting for a redshift of z = 0.0035, measured from narrow H_alpha and H_beta lines and consistent with the redshift of the host galaxy ESO 138-G010 (Koribalski et al. 2004), the velocities of these P-Cyg absorptions are of order 6000-8000 km/s. We note that the narrow (FWHM < 250 km/s) H_alpha profile exhibits a blue-to-red asymmetry that suggests it may associated with the supernova. These data currently indicate 2013xx to possibly be a type-IIL/IIn intermediate object, although further observations are encouraged to verify this classification.
Quote:
Originally Posted by Terry B
The spectra is very flat and featureless.
Gelato matches it to a SN11n at 7 days but it is pretty hard to be sure with so few features. I took 75mins of exposure but this only gave me a SN of about 15. See attached.
Cheers
Terry
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