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SN 2016B a.k.a. ASASSN-16ab: a transitional Type II supernova

Dastidar, Raya and Misra, Kuntal and Singh, Mridweeka and Sahu, DK and Pastorello, A and Gangopadhyay, Anjasha and Tomasella, L and Benetti, S and Terreran, G and Sanwal, Pankaj and Kumar, Brijesh and Singh, Avinash and Kumar, Brajesh and Anupama, GC and Pandey, SB (2019) SN 2016B a.k.a. ASASSN-16ab: a transitional Type II supernova. In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 486 (2). pp. 2850-2872.

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Official URL: https://doi.org/10.1093/mnras/stz949


We present photometry, polarimetry, and spectroscopy of the Type II supernova ASASSN-16ab/SN 2016B in PGC 037392. The photometric and spectroscopic follow-up commenced about 2 weeks after shock breakout and continued until nearly 6 months. The light curve of SN 2016B exhibits intermediate properties between those of Type IIP and IIL. The early decline is steep (1.68 +/- 0.10 mag 100 d(-1)), followed by a shallower plateau phase (0.47 +/- 0.24 mag 100 d(-1)). The optically thick phase lasts for 118 d, similar to Type IIP. The Ni-56 mass estimated from the radioactive tail of the bolometric light curve is 0.082 +/- 0.019 M-circle dot. High-velocity component contributing to the absorption trough of H alpha and H beta in the photospheric spectra are identified from the spectral modelling from about 57-97 d after the outburst, suggesting a possible SN ejecta and circumstellar material interaction. Such high-velocity features are common in the spectra of Type IIL supernovae. By modelling the true bolometric light curve of SN 2016B, we estimated a total ejected mass of similar to 15 M-circle dot, kinetic energy of similar to 1.4 foe, and an initial radius of similar to 400 R-circle dot.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to OXFORD UNIV PRESS
Keywords: techniques: photometric; techniques: polarimetric; techniques: spectroscopic; supernovae: general; supernovae: individual: ASASSN-16ab/SN 2016B; galaxies: individual: PGC 037392
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 05 Feb 2020 09:45
Last Modified: 05 Feb 2020 09:45
URI: http://eprints.iisc.ac.in/id/eprint/63331

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