The double-peaked Type Ic supernova 2019cad: another SN 2005bf-like object
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Archivos
Fecha
2021-04
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
Licencia CC
Resumen
We present the photometric and spectroscopic evolution of supernova (SN) 2019cad during the first ∼100 d from explosion.
Based on the light-curve morphology, we find that SN 2019cad resembles the double-peaked Type Ib/c SN 2005bf and the Type
Ic PTF11mnb. Unlike those two objects, SN 2019cad also shows the initial peak in the redder bands. Inspection of the g-band
light curve indicates the initial peak is reached in ∼8 d, while the r-band peak occurred ∼15 d post-explosion. A second and
more prominent peak is reached in all bands at ∼45 d past explosion, followed by a fast decline from ∼60 d. During the first
30 d, the spectra of SN 2019cad show the typical features of a Type Ic SN, however, after 40 d, a blue continuum with prominent
lines of Si II λ6355 and CII λ6580 is observed again. Comparing the bolometric light curve to hydrodynamical models, we
find that SN 2019cad is consistent with a pre-SN mass of 11 M, and an explosion energy of 3.5 × 1051 erg. The light-curve
morphology can be reproduced either by a double-peaked 56Ni distribution with an external component of 0.041 M, and an
internal component of 0.3 M or a double-peaked 56Ni distribution plus magnetar model (P ∼ 11 ms and B ∼ 26 × 1014 G). If
SN 2019cad were to suffer from significant host reddening (which cannot be ruled out), the 56Ni model would require extreme
values, while the magnetar model would still be feasible
Notas
Indexación: Scopus
Palabras clave
supernovae: general – supernovae: individual: SN 2019cad.
Citación
Monthly Notices of the Royal Astronomical Society Open Access Volume 504, Issue 4, Pages 4907 - 49221 July 2021