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SN 2018gj: A Short Plateau Type II Supernova with Persistent Blueshifted Ha Emission

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dc.contributor.author Teja, Rishabh Singh
dc.contributor.author Singh, Avinash
dc.contributor.author Sahu, D. K.
dc.contributor.author Anupama, G. C.
dc.contributor.author Kumar, Brajesh
dc.contributor.author Nakaoka, Tatsuya
dc.contributor.author Kawabata, Koji S
dc.contributor.author Yamanaka, Masayuki
dc.contributor.author Takey, Ali
dc.contributor.author Kawabata, Miho
dc.date.accessioned 2024-02-16T09:21:58Z
dc.date.available 2024-02-16T09:21:58Z
dc.date.issued 2023-09
dc.identifier.uri https://doi.org/10.3847/1538-4357/acdf5e
dc.identifier.uri http://localhost:8080/xmlui/handle/123456789/1443
dc.description.abstract We present an extensive, panchromatic photometric (UV, optical, and near-IR) and low-resolution optical spectroscopic coverage of a Type IIP supernova SN 2018gj that occurred on the outskirts of the host galaxy NGC 6217. From the V-band light curve, we estimate the plateau length to be ∼ 70 ± 2 days, placing it among the very few well-sampled short plateau supernovae (SNe). With V-band peak absolute magnitude MV −17.0 ± 0.1 mag, it falls in the middle of the luminosity distribution of the Type II SNe. The color evolution is typical to other Type II SNe except for an early elbow-like feature in the evolution of V − R color owing to its early transition from the plateau to the nebular phase. Using the expanding photospheric method, we present an independent estimate of the distance to SN 2018gj. We report the spectral evolution to be typical of a Type II SNe. However, we see a persistent blueshift in emission lines until the late nebular phase, not ordinarily observed in Type II SNe. The amount of radioactive nickel ( 56Ni) yield in the explosion was estimated to be 0.026 ± 0.007 Me. We infer from semianalytical modeling, nebular spectrum, and 1D hydrodynamical modeling that the probable progenitor was a red supergiant with a zero-age-main-sequence mass 13 Me. In the simulated hydrodynamical model light curves, reproducing the early optical bolometric light curve required an additional radiation source, which could be the interaction with the proximal circumstellar matter. en_US
dc.language.iso en en_US
dc.publisher The Astrophysical Journal en_US
dc.relation.ispartofseries 2030;apj954-155
dc.subject Observational astronomy en_US
dc.subject Type II supernovae en_US
dc.subject Hydrodynamical simulations en_US
dc.subject Red supergiant stars en_US
dc.title SN 2018gj: A Short Plateau Type II Supernova with Persistent Blueshifted Ha Emission en_US
dc.type Article en_US


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