SN 2018hna: 1987A-like Supernova with a Signature of Shock Breakout
| Autor: | Masayuki Yamanaka, Hiroshi Akitaya, Ramya M. Anche, Keiichi Maeda, Mahito Sasada, Anirban Dutta, Hiroyuki Maehara, Nozomu Tominaga, G. C. Anupama, Tatsuya Nakaoka, D. K. Sahu, Avinash Singh, Sudhanshu Barway, Takashi Nagao, Kenta Taguchi, Keisuke Isogai, Masaru Kino, Koji S. Kawabata, Miho Kawabata, Sergei Blinnikov, Varun Bhalerao, Brajesh Kumar, P. V. Baklanov, Harsh Kumar, Kengo Takagi |
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| Rok vydání: | 2019 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics 010504 meteorology & atmospheric sciences Metallicity FOS: Physical sciences Astronomy and Astrophysics Astrophysics Radius Light curve Type II supernova 01 natural sciences Galaxy Supernova Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science 0103 physical sciences Red supergiant Supergiant Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences |
| Zdroj: | The Astrophysical Journal. 882:L15 |
| ISSN: | 2041-8213 |
| DOI: | 10.3847/2041-8213/ab3d44 |
| Popis: | 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 exhibit the adiabatic cooling envelope emission following the shock breakout up to ~14 days from the explosion. SN~2018hna has a rise time of $\sim$\,88 days in the V-band, similar to SN 1987A. A $\rm^{56}Ni$ mass of ~0.087$\pm$0.004 $\rm M_{\odot}$ is inferred for SN 2018hna from its bolometric light curve. Hydrodynamical modelling of the cooling phase suggests a progenitor with a radius ~50 $\rm R_{\odot}$, a mass of ~14-20 $\rm M_{\odot}$ and explosion energy of ~1.7-2.9$\rm \times$ $\rm 10^{51}\ erg$. The smaller inferred radius of the progenitor than a standard red supergiant is indicative of a blue supergiant progenitor of SN 2018hna. A sub-solar metallicity (~0.3 $\rm Z_{\odot}$) is inferred for the host galaxy UGC 07534, concurrent with the low-metallicity environments of 1987A-like events. 8 pages, 5 figures, Accepted for Publication in ApJ Letters |
| Databáze: | OpenAIRE |
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