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SN 2020bqj: a Type Ibn supernova with a long lasting peak plateau | | E. C. Kool
; E. Karamehmetoglu
; J. Sollerman
; S. Schulze
; R. Lunnan
; T. M. Reynolds
; C. Barbarino
; E. C. Bellm
; K. De
; D. A. Duev
; C. Fremling
; V. Z. Golkhou
; M. L. Graham
; D. A. Green
; A. Horesh
; S. Kaye
; Y.-L. Kim
; R. R. Laher
; F. J. Masci1
; J. Nordin
; D. A. Perley
; E. S. Phinney
; M. Porter
; D. Reiley
; H. Rodriguez
; J. van Roestel
; B. Rusholme
; Y. Sharma
; I. Sfaradi
; M. T. Soumagnac
; K. Taggart
; L. Tartaglia
; D. R. A. Williams
; L. Yan
; | | Date: |
10 Aug 2020 | | Abstract: | Context. Type Ibn supernovae (SNe Ibn) are a rare class of stripped envelope
supernovae interacting with a helium-rich circumstellar medium (CSM). The
majority of the SNe Ibn reported in the literature display a surprising
homogeneity in their fast-evolving lightcurves and are typically found in
actively starforming spiral galaxies. Aims. We present the discovery and the
study of SN 2020bqj (ZTF20aalrqbu), a SN Ibn with a long-duration peak plateau
lasting 40 days and hosted by a faint low-mass galaxy. We aim to explain its
peculiar properties using an extensive photometric and spectroscopic data set.
Methods. We compare the photometric and spectral evolution of SN 2020bqj with
regular SNe Ibn from the literature, as well as with other outliers in the SN
Ibn subclass. We fit the bolometric and multi-band lightcurves with powering
mechanism models such as radioactive decay and CSM interaction. We also model
the host galaxy of SN 2020bqj. Results. The risetime, peak magnitude and
spectral features of SN 2020bqj are consistent with those of most SNe Ibn, but
the SN is a clear outlier in the subclass based on its bright, long-lasting
peak plateau and the low mass of its faint host galaxy. We show through
modeling that the lightcurve of SN 2020bqj can be powered predominantly by
shock heating from the interaction of the SN ejecta and a dense CSM. The
peculiar Type Ibn SN 2011hw is a close analog to SN 2020bqj in terms of
lightcurve and spectral evolution, suggesting a similar progenitor and CSM
scenario. In this scenario a very massive progenitor star in the transitional
phase between a luminous blue variable and a compact Wolf-Rayet star undergoes
core-collapse, embedded in a dense helium-rich CSM with an elevated opacity
compared to normal SNe Ibn, due to the presence of residual hydrogen. This
scenario is consistent with the observed properties of SN 2020bqj and the
modeling results. | | Source: | arXiv, 2008.04056 | | Services: | Forum | Review | PDF | Favorites | |
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