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

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

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Official URL: https://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 similar to 14 days from the explosion. SN. 2018hna has a rise time of similar to 88 days in the V band, similar to SN 1987A. A Ni-56 mass of similar to 0.087 +/- 0.004 M-circle dot is inferred for SN 2018hna from its bolometric LC. Hydrodynamical modeling of the cooling phase suggests a progenitor with a radius similar to 50 R-circle dot, a mass of similar to 14-20 M-circle dot, and an explosion energy of similar to 1.7-2.9 x 10(51) 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 (similar to 0.3 Z(circle dot)) is inferred for the host galaxy UGC 07534, concurrent with the low-metallicity environments of 1987A-like events.

Item Type: Journal Article
Additional Information: copyright for this article belongs to IOP PUBLISHING LTD
Keywords: Supernovae (1668); Core-collapse supernovae (304); Type II supernovae (1731)
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 18 Oct 2019 05:47
Last Modified: 18 Oct 2019 05:47
URI: http://eprints.iisc.ac.in/id/eprint/63683

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