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Luminous Type II supernovae with low expansion velocities | | Ó. Rodríguez
; G. Pignata
; J. P. Anderson
; T. J. Moriya
; A. Clocchiatti
; F. Förster
; J. L. Prieto
; M. M. Phillips
; C. R. Burns
; C. Contreras
; G. Folatelli
; C. P. Gutiérrez
; M. Hamuy
; N. I. Morrell
; M. D. Stritzinger
; N. B. Suntzeff
; J. Maza
; R. Antezana
; R. Cartier
; L. González
; J. B. Haislip
; V. Kouprianov
; P. López
; S. Marchi-Lasch
; D. Reichart
; | | Date: |
9 Oct 2019 | | Abstract: | We present optical and near-IR photometry of three Type II supernovae (SNe
II), SN 2008bm, SN 2009aj, and SN 2009au. These SNe display the following
common characteristics: signs of early interaction of the ejecta with
circumstellar material (CSM), blue $B!-!V$ colours, weakness of metal lines,
low expansion velocities, and $V$-band absolute magnitudes 2-3 mag brighter
than those expected for normal SNe II based on their expansion velocities. Two
more SNe reported in the literature (SN 1983K and LSQ13fn) share properties
similar to our sample. Analysing this set of five luminous with low expansion
velocities (LLEV) SNe II, we find that their properties can be reproduced
assuming ejecta-CSM interaction that lasts between 4-11 weeks post explosion.
The contribution of this interaction to the radiation field seems to be the
dominant component determining the observed weakness of metal lines in the
spectra rather than the progenitor metallicity. Based on hydrodynamic
simulations, we find that the interaction of the ejecta with a CSM of ~3.6
M$_odot$ can reproduce the light curves and expansion velocities of SN 2009aj.
Using data collected by the Chilean Automatic Supernova Search, we estimate an
upper limit for the LLEV SNe II fraction to be 2-4 per cent of all normal SNe
II. With the current data-set, it is not clear whether the LLEV events are a
separated class of SNe II with a different progenitor system, or whether they
are the extreme of a continuum mediated by CSM interaction with the rest of the
normal SN II population. | | Source: | arXiv, 1910.4592 | | Services: | Forum | Review | PDF | Favorites | |
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