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Title: Light Curve and Spectral Evolution of Type IIb Supernovae
Authors: Gangopadhyay, A
Misra, K
Pastorello, A
Sahu, D. K
Singh, M
Dastidar, R
Anapuma, G. C
Kumar, B
Pandey, S. B
Keywords: Astronomy;Astrophysics;Supernovae;Photometry;Extragalactic
Issue Date: Apr-2018
Publisher: Bulletin de la Societe Royale des Sciences de Liege
Citation: Bulletin de la Societe Royale des Sciences de Liege, Vol. 87, pp. 351-355
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.
Description: Open Access
ISSN: 0037-9565
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Appears in Collections:IIAP Publications

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