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20 April 2024 |
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The Unique Type Ib Supernova 2005bf: A WN Star Explosion Model for Peculiar Light Curves and Spectra | | N. Tominaga
; M. Tanaka
; K. Nomoto
; P.A. Mazzali
; J. Deng
; K. Maeda
; H. Umeda
; M. Modjaz
; M. Hicken
; P. Challis
; R.P. Kirshner
; W.M. Wood-Vasey
; C.H. Blake
; J.S. Bloom
; M.F. Skrutskie
; A. Szentgyorgyi
; E.E. Falco
; N. Inada
; T. Minezaki
; Y. Yoshii
; K. Kawabata
; M. Iye
; G.C. Anupama
; D.K. Sahu
; T.P. Prabhu
; | | Date: |
19 Sep 2005 | | Abstract: | Observations and modeling for the light curve (LC) and spectra of supernova (SN) 2005bf are reported. This SN showed unique features: the LC had two maxima, and declined rapidly after the second maximum, while the spectra showed strengthening He lines whose velocity increased with time. The double-peaked LC can be reproduced by a double-peaked $^{56}$Ni distribution, with most $^{56}$Ni at low velocity and a small amount at high velocity. The rapid post-maximum decline requires a large fraction of the $gamma$-rays to escape from the $^{56}$Ni-dominated region, possibly because of low-density ``holes’’. The presence of Balmer lines in the spectrum suggests that the He layer of the progenitor was substantially intact. Increasing $gamma$-ray deposition in the He layer due to enhanced $gamma$-ray escape from the $^{56}$Ni-dominated region may explain both the delayed strengthening and the increasing velocity of the He lines. The SN has massive ejecta ($sim6-7Msun$), normal kinetic energy ($sim 1.0-1.5 imes 10^{51}$ ergs), high peak bolometric luminosity ($sim 5 imes 10^{42}$ erg s$^{-1}$) for an epoch as late as $sim$ 40 days, and a large $^{56}$Ni mass ($sim0.32Msun$). These properties, and the presence of a small amount of H suggest that the progenitor was initially massive (M$sim 25-30 Msun$) and had lost most of its H envelope, possibly a WN star. The double-peaked $^{56}$Ni distribution suggests that the explosion may have formed jets that did not reach the He layer. The properties of SN 2005bf resemble those of the explosion of Cassiopeia A. | | Source: | arXiv, astro-ph/0509557 | | Services: | Forum | Review | PDF | Favorites | |
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