SN 2016B a.k.a. ASASSN-16ab: a transitional Type II supernova
Date Issued
2019
Author(s)
Dastidar, Raya
•
Misra, Kuntal
•
Singh, Mridweeka
•
Sahu, D. K.
•
•
Gangopadhyay, Anjasha
•
•
•
Terreran, G.
•
Sanwal, Pankaj
•
Kumar, Brijesh
•
Singh, Avinash
•
Kumar, Brajesh
•
Anupama, G. C.
•
Pandey, S. B.
Abstract
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 56Ni mass estimated from the radioactive tail of the bolometric light curve is 0.082 ± 0.019 M☉. High-velocity component contributing to the absorption trough of H α and H β 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 ∼15 M☉, kinetic energy of ∼1.4 foe, and an initial radius of ∼400 R☉.
Volume
486
Issue
2
Start page
2850
Issn Identifier
0035-8711
Ads BibCode
2019MNRAS.486.2850D
Rights
open.access
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