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24 April 2024 |
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A fallback accretion model for the unusual type II-P supernova iPTF14hls | | Ling-Jun Wang
; Xiao-Feng Wang
; Shan-Qin Wang
; Zi-Gao Dai
; Liang-Duan Liu
; Li-Ming Song
; Li-Ming Rui
; Zach Cano
; Bing Li
; | | Date: |
12 Feb 2018 | | Abstract: | The Intermediate Palomar Transient Factory reported the discovery of an
unusual type II-P supernova iPTF14hls. Instead of a ~ 100-day plateau as
observed for ordinary type II-P supernovae (SNe), the light curve of iPTF14hls
has at least five distinct peaks. The effective temperature of iPTF14hls is
roughly constant at 5000-6000K . The very slow evolution of the optical
spectra, combined with the duration of one individual peak in the light curve,
implies a massive ejecta. In this paper we propose that the multi-peaked light
curve of iPTF14hls is a result of intermittent fallback accretion. Detailed
modeling indicates that the total fallback mass is ~0.2M_sun, with an ejecta
mass M_{ej}=21M_sun. We find the third peak of the light curve cannot be well
fit by the fallback model, indicating that there could be some extra rapid
energy injection. We suggest that this extra energy injection may be a result
of a magnetic outburst if the central object is a neutron star. It is found
that this burst lasted for ~20 days with a total burst energy 3.9 imes 10^{48}
erg . The above results indicate that the progenitor of iPTF14hls could be a
massive red supergiant. | | Source: | arXiv, 1802.3982 | | Services: | Forum | Review | PDF | Favorites | |
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