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SN 2019nyk: A rapidly declining Type II supernova with early interaction signatures

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dc.contributor.author Dastidar, Raya
dc.contributor.author Pignata, Giuliano
dc.contributor.author Dukiya, Naveen
dc.contributor.author Misra, Kuntal
dc.contributor.author Hiramatsu, Daichi
dc.contributor.author Silva-Farfan, Javier
dc.contributor.author Howel, D. Andrew
dc.contributor.author Bostroem, K. Azalee
dc.contributor.author Singh, Mridweeka
dc.contributor.author Gangopadhyay, Anjasha
dc.contributor.author Kumar, Amit
dc.contributor.author McCully, Curtis
dc.date.accessioned 2024-06-21T08:37:49Z
dc.date.available 2024-06-21T08:37:49Z
dc.date.issued 2024-05
dc.identifier.citation Astronomy & Astrophysics, Vol. 685, A44 en_US
dc.identifier.issn 0004-6361
dc.identifier.uri http://hdl.handle.net/2248/8489
dc.description Open Access. en_US
dc.description Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.description.abstract We present an optical photometric and spectroscopic analysis of the fast-declining hydrogen-rich Type II supernova (SN) 2019nyk. The light curve properties of SN 2019nyk align well with those of other fast-declining Type II SNe, such as SNe 2013by and 2014G. SN 2019nyk exhibits a peak absolute magnitude of −18.09 ± 0.17 mag in the V band, followed by a rapid decline at 2.84 ± 0.03 mag (100 d)−1 during the recombination phase. The early spectra of SN 2019nyk exhibit high-ionisation emission features as well as narrow H Balmer lines, persisting until 4.1 d since explosion, indicating the presence of circumstellar material (CSM) in close proximity. A comparison of these features with other Type II SNe displaying an early interaction reveals similarities between these features and those observed in SNe 2014G and 2023ixf. We also compared the early spectra to literature models, estimating a mass-loss rate of the order of 10−3 M⊙ yr−1 . Radiation hydrodynamical modelling of the light curve also suggests the mass loss from the progenitor within a short period prior to explosion, totalling 0.16 M⊙ of material within 2900 R⊙ of the progenitor. Furthermore, light curve modelling infers a zero-age main sequence mass of 15 M⊙ for the progenitor, a progenitor radius of 1031 R⊙, and an explosion energy of 1.1×1051 erg. en_US
dc.language.iso en en_US
dc.publisher EDP Sciences en_US
dc.relation.uri https://doi.org/10.1051/0004-6361/202348642
dc.rights © The Authors 2024
dc.subject Supernovae: general en_US
dc.subject Supernovae: individual: SN 2019nyk en_US
dc.subject Supernovae: individual: ZTF19abqrhvt en_US
dc.title SN 2019nyk: A rapidly declining Type II supernova with early interaction signatures en_US
dc.type Article en_US


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