SN 2018hna: 1987A-like Supernova with a Signature of Shock Breakout

Singh, Avinash ; Sahu, D. K. ; Anupama, G. C. ; Kumar, Brajesh ; Kumar, Harsh ; Yamanaka, Masayuki ; Baklanov, Petr V. ; Tominaga, Nozomu ; Blinnikov, Sergei I. ; Maeda, Keiichi ; Dutta, Anirban ; Bhalerao, Varun ; Anche, Ramya M. ; Barway, Sudhanshu ; Akitaya, Hiroshi ; Nakaoka, Tatsuya ; Kawabata, Miho ; Kawabata, Koji S ; Sasada, Mahito ; Takagi, Kengo ; Maehara, Hiroyuki ; Isogai, Keisuke ; Kino, Masaru ; Taguchi, Kenta ; Nagao, Takashi (2019) SN 2018hna: 1987A-like Supernova with a Signature of Shock Breakout The Astrophysical Journal, 882 (2). L15. ISSN 2041-8213

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Official URL: http://doi.org/10.3847/2041-8213/ab3d44

Related URL: http://dx.doi.org/10.3847/2041-8213/ab3d44

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.

Item Type:Article
Source:Copyright of this article belongs to IOP Publishing
ID Code:130600
Deposited On:01 Dec 2022 11:04
Last Modified:01 Dec 2022 11:04

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