SN 2020wnt: a slow-evolving carbon-rich superluminous supernova with no O II lines and a bumpy light curve
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Archivos
Fecha
2022-09
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Oxford University Press
Nombre de Curso
Licencia CC
Atribution 4.0 International (CC BY 4.0)
Licencia CC
https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
We present the analysis of SN 2020wnt, an unusual hydrogen-poor superluminous supernova (SLSN-I), at a redshift of 0.032.
The light curves of SN 2020wnt are characterized by an early bump lasting ∼5 d, followed by a bright main peak. The SN reaches
a peak absolute magnitude of Mmax
r = −20.52 ± 0.03 mag at ∼77.5 d from explosion. This magnitude is at the lower end of the
luminosity distribution of SLSNe-I, but the rise-time is one of the longest reported to date. Unlike other SLSNe-I, the spectra of
SN 2020wnt do not show O II, but strong lines of C II and Si II are detected. Spectroscopically, SN 2020wnt resembles the Type
Ic SN 2007gr, but its evolution is significantly slower. Comparing the bolometric light curve to hydrodynamical models, we find
that SN 2020wnt luminosity can be explained by radioactive powering. The progenitor of SN 2020wnt is likely a massive and
extended star with a pre-SN mass of 80 M and a pre-SN radius of 15 R that experiences a very energetic explosion of 45 × 1051
erg, producing 4 M of 56Ni. In this framework, the first peak results from a post-shock cooling phase for an extended progenitor,
and the luminous main peak is due to a large nickel production. These characteristics are compatible with the pair-instability SN
scenario. We note, however, that a significant contribution of interaction with circumstellar material cannot be ruled out.
Notas
Indexación: Scopus.
Palabras clave
Supernovae General, Supernovae Individual, SN 2020wnt
Citación
Monthly Notices of the Royal Astronomical Society, Volume 517, Issue 2, December 2022, Pages 2056–2075
DOI
10.1093/mnras/stac2747