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

Pandey, S B ; Anupama, G C ; Kumar, Brajesh ; Singh, Avinash ; Kumar, Brijesh ; Sanwal, Pankaj ; Terreran, G ; Benetti, S ; Tomasella, L ; Gangopadhyay, Anjasha ; Pastorello, A ; Sahu, D K ; Singh, Mridweeka ; Misra, Kuntal ; Dastidar, Raya (2019) SN 2016B a.k.a. ASASSN-16ab: a transitional Type II supernova Monthly Notices of the Royal Astronomical Society, 486 (2). pp. 2850-2872. ISSN 0035-8711

[img] PDF
3MB

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

Related URL: http://dx.doi.org/10.1093/mnras/stz949

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⊙.

Item Type:Article
Source:Copyright of this article belongs to The Royal Astronomical Society
Keywords:techniques: photometric, techniques: polarimetric, techniques: spectroscopic, supernovae: general, supernovae: individual: ASASSN-16ab/SN 2016B, galaxies: individual: PGC 037392
ID Code:130605
Deposited On:01 Dec 2022 11:06
Last Modified:01 Dec 2022 11:06

Repository Staff Only: item control page