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Title: SN 2018hna: 1987A-like supernova with a signature of shock breakout
Authors: Singh, A
Sahu, D. K
Anupama, G. C
Brajesh Kumar
Harsh Kumar
Yamanaka, Masayuki
Baklanov, Petr V
Tominaga, Nozomu
Blinnikov, Sergei. I
Maeda, Keiichi
Anirban, D
Bhalerao, Varun
Ramya, M. Anche
Barway, S
Akitaya, Hiroshi
Nakaoka, Tatsuya
Kawabata, Miho
Kawabata, Koji. S
Sasada, Mahito
Takagi, Kengo
Maehara, Hiroyuki
Isogai, Keisuke
Kino, Masaru
Taguchi, Kenta
Nagao, Takashi
Keywords: Supernovae (1668);Core-collapse supernovae (304);Type II supernovae (1731)
Issue Date: 10-Sep-2019
Publisher: IOP Publishing
Citation: The Astrophysical Journal Letters, Vol. 882, No. 2, L15
Abstract: High-cadence ultraviolet, optical, and near-infrared photometric and low-resolution spectroscopic observations of the peculiar Type II supernova (SN) 2018hna are presented. The early-phase multiband light curves (LCs) exhibit the adiabatic cooling envelope emission following the shock breakout up to ~ 14 days from the explosion. SN 2018hna has a rise time of ~ 88 days in the V band, similar to SN 1987A. A 56Ni mass of ~0.087 ± 0.004 M ⊙ is inferred for SN 2018hna from its bolometric LC. Hydrodynamical modeling of the cooling phase suggests a progenitor with a radius ~50 R ⊙, a mass of ~14–20 M ⊙, and an explosion energy of ~1.7–2.9 × 1051 erg. The smaller inferred radius of the progenitor than a standard red supergiant is indicative of a blue supergiant progenitor of SN 2018hna. A subsolar metallicity (~0.3 Z ⊙) is inferred for the host galaxy UGC 07534, concurrent with the low-metallicity environments of 1987A-like events.
Description: Restricted Access
ISSN: 2041-8205
???metadata.dc.rights???: © The American Astronomical Society
Appears in Collections:IIAP Publications

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