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Confined Dense Circumstellar Material Surrounding a Regular Type II Supernova: The Unique Flash-Spectroscopy Event - SN 2013fs | | O. Yaron
; D. A. Perley
; A. Gal-Yam
; J. H. Groh
; A. Horesh
; E. O. Ofek
; S. R. Kulkarni
; J. Sollerman
; C. Fransson
; A. Rubin
; P. Szabo
; N. Sapir
; F. Taddia
; S. B. Cenko
; S. Valenti
; I. Arcavi
; D. A. Howell
; M. M. Kasliwal
; P. M. Vreeswijk
; D. Khazov
; O. D. Fox
; Y. Cao
; O. Gnat
; P. L. Kelly
; P. E. Nugent
; A. V. Filippenko
; R. R. Laher
; P. R. Wozniak
; W. H. Lee
; U. D. Rebbapragada
; K. Maguire
; M. Sullivan
; M. T. Soumagnac
; | | Date: |
10 Jan 2017 | | Abstract: | With the advent of new wide-field, high-cadence optical transient surveys,
our understanding of the diversity of core-collapse supernovae has grown
tremendously in the last decade. However, the pre-supernova evolution of
massive stars, that sets the physical backdrop to these violent events, is
theoretically not well understood and difficult to probe observationally. Here
we report the discovery of the supernova iPTF13dqy = SN 2013fs, a mere ~3 hr
after explosion. Our rapid follow-up observations, which include
multiwavelength photometry and extremely early (beginning at ~6 hr
post-explosion) spectra, map the distribution of material in the immediate
environment (<~ 10^15 cm) of the exploding star and establish that it was
surrounded by circumstellar material (CSM) that was ejected during the final ~1
yr prior to explosion at a high rate, around 10^-3 solar masses per year. The
complete disappearance of flash-ionised emission lines within the first several
days requires that the dense CSM be confined to within <~ 10^15 cm, consistent
with radio non-detections at 70--100 days. The observations indicate that
iPTF13dqy was a regular Type II SN; thus, the finding that the likely red
supergiant (RSG) progenitor of this common explosion ejected material at a
highly elevated rate just prior to its demise suggests that pre-supernova
instabilities may be ubiquitous among exploding massive stars. | | Source: | arXiv, 1701.2596 | | Services: | Forum | Review | PDF | Favorites | |
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