English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present an extensive, panchromatic photometric (UV, Optical, and NIR) andlow-resolution optical spectroscopic coverage of a Type IIP supernova SN 2018gjthat occurred on the outskirts of the host galaxy NGC 6217. From the V-bandlight curve, we estimate the plateau length to be ~ 70 +- 2 d, placing it amongthe very few well-sampled short plateau supernovae (SNe). With V-band peakabsolute magnitude Mv < -17.0 +- 0.1 mag, it falls in the middle of theluminosity distribution of the Type II SNe. The colour evolution is typical toother Type II SNe except for an early elbow-like feature in the evolution ofV-R colour owing to its early transition from the plateau to the nebular phase.Using the expanding photospheric method, we present an independent estimate ofthe distance to SN 2018gj. We report the spectral evolution to be typical of aType II SNe. However, we see a persistent blue shift in emission lines untilthe late nebular phase, not ordinarily observed in Type II SNe. The amount ofradioactive nickel (56Ni) yield in the explosion was estimated to be 0.026 +-0.007 Msol. We infer from semi-analytical modelling, nebular spectrum, and 1-Dhydrodynamical modelling that the probable progenitor was a red supergiant witha zero-age-main-sequence mass < 13 Msol. In the simulated hydrodynamical modellight curves, reproducing the early optical bolometric light curve required anadditional radiation source, which could be the interaction with the proximalcircumstellar matter (CSM).

SN 2018gj: A Short-plateau Type II Supernova with Persistent Blue-shifted H-alpha Emission