Abstract:
Stripped-Envelope Supernovae constitute the sub-class of core-collapse supernovae that strip off
their outer hydrogen envelope due to high stellar winds or due to interaction with a binary companion where
mass transfer occurs as a result of Roche lobe overflow. We present here the photometric and spectroscopic
analysis of a member of this class : SN 2015as classified as a type IIb supernova. Light curve features are
similar to those of SN 2011fu while spectroscopic features are quite similar to those of SN 2008ax and SN
2011dh. Early epoch spectra have been modelled with SYN++ which indicates a photospheric velocity of 8500
km sec−1
and temperature of 6500K. Spectroscopic lines show transitioning from H to He features confirming
it to be a type IIb supernova. Prominent oxygen and calcium emission features are indicative of the asymmetry
of the ejecta. We also estimate the signal to noise ratio of the 3.6m telescope data. This telescope is located at
ARIES, Devasthal, Nainital at an altitude of 2450m. We also show the comparison plots of spectra taken with
a 2m and 4m class telescopes to enlighten the importance of spectral features displayed by bigger diameter
telescopes.
