Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/8256
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dc.contributor.authorTeja, Rishabh Singh-
dc.contributor.authorSingh, Avinash-
dc.contributor.authorSahu, D. K-
dc.contributor.authorAnupama, G. C-
dc.contributor.authorKumar, Brajesh-
dc.contributor.authorNakaoka, Tatsuya-
dc.contributor.authorKawabata, Koji S-
dc.contributor.authorYamanaka, Masayuki-
dc.contributor.authorTakey, Ali-
dc.contributor.authorKawabata, Miho-
dc.date.accessioned2023-09-15T06:51:00Z-
dc.date.available2023-09-15T06:51:00Z-
dc.date.issued2023-09-10-
dc.identifier.citationThe Astrophysical Journal, Vol. 954, No. 2, 155en_US
dc.identifier.issn1538-4357-
dc.identifier.urihttp://hdl.handle.net/2248/8256-
dc.descriptionOpen Accessen_US
dc.descriptionOriginal content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.-
dc.description.abstractWe 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 M⊙. 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 M⊙. 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.isoenen_US
dc.publisherAmerican Astronomical Societyen_US
dc.relation.urihttps://doi.org/10.3847/1538-4357/acdf5e-
dc.rights© 2023. The Author(s).-
dc.subjectObservational astronomy (1145)en_US
dc.subjectType II supernovae (1731)en_US
dc.subjectHydrodynamical simulations (767)en_US
dc.subjectRed supergiant stars (1375)en_US
dc.subjectSupporting material: data behind figure, machine-readable tablesen_US
dc.titleSN 2018gj: A Short Plateau Type II Supernova with Persistent Blueshifted Ha Emissionen_US
dc.typeArticleen_US
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